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-rw-r--r--kernel/auditsc.c1
-rw-r--r--kernel/cpuset.c142
-rw-r--r--kernel/delayacct.c2
-rw-r--r--kernel/exit.c6
-rw-r--r--kernel/fork.c3
-rw-r--r--kernel/kprobes.c62
-rw-r--r--kernel/ksysfs.c8
-rw-r--r--kernel/lockdep.c26
-rw-r--r--kernel/lockdep_proc.c61
-rw-r--r--kernel/mutex.c35
-rw-r--r--kernel/posix-timers.c6
-rw-r--r--kernel/printk.c59
-rw-r--r--kernel/profile.c4
-rw-r--r--kernel/ptrace.c13
-rw-r--r--kernel/rcupdate.c8
-rw-r--r--kernel/resource.c26
-rw-r--r--kernel/sched.c1477
-rw-r--r--kernel/sched_debug.c282
-rw-r--r--kernel/sched_fair.c811
-rw-r--r--kernel/sched_idletask.c8
-rw-r--r--kernel/sched_rt.c19
-rw-r--r--kernel/sched_stats.h28
-rw-r--r--kernel/sysctl.c47
-rw-r--r--kernel/time.c6
-rw-r--r--kernel/time/Kconfig5
-rw-r--r--kernel/time/Makefile2
-rw-r--r--kernel/time/clockevents.c3
-rw-r--r--kernel/time/tick-broadcast.c44
-rw-r--r--kernel/time/tick-common.c5
-rw-r--r--kernel/time/timekeeping.c7
-rw-r--r--kernel/user.c249
31 files changed, 1967 insertions, 1488 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 04f3ffb8d9d..0ae703c157b 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1525,6 +1525,7 @@ add_names:
context->names[idx].ino = (unsigned long)-1;
}
}
+EXPORT_SYMBOL_GPL(__audit_inode_child);
/**
* auditsc_get_stamp - get local copies of audit_context values
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 57e6448b171..0864f409793 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -581,26 +581,28 @@ static void guarantee_online_cpus(const struct cpuset *cs, cpumask_t *pmask)
/*
* Return in *pmask the portion of a cpusets's mems_allowed that
- * are online. If none are online, walk up the cpuset hierarchy
- * until we find one that does have some online mems. If we get
- * all the way to the top and still haven't found any online mems,
- * return node_online_map.
+ * are online, with memory. If none are online with memory, walk
+ * up the cpuset hierarchy until we find one that does have some
+ * online mems. If we get all the way to the top and still haven't
+ * found any online mems, return node_states[N_HIGH_MEMORY].
*
* One way or another, we guarantee to return some non-empty subset
- * of node_online_map.
+ * of node_states[N_HIGH_MEMORY].
*
* Call with callback_mutex held.
*/
static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
{
- while (cs && !nodes_intersects(cs->mems_allowed, node_online_map))
+ while (cs && !nodes_intersects(cs->mems_allowed,
+ node_states[N_HIGH_MEMORY]))
cs = cs->parent;
if (cs)
- nodes_and(*pmask, cs->mems_allowed, node_online_map);
+ nodes_and(*pmask, cs->mems_allowed,
+ node_states[N_HIGH_MEMORY]);
else
- *pmask = node_online_map;
- BUG_ON(!nodes_intersects(*pmask, node_online_map));
+ *pmask = node_states[N_HIGH_MEMORY];
+ BUG_ON(!nodes_intersects(*pmask, node_states[N_HIGH_MEMORY]));
}
/**
@@ -753,68 +755,13 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
}
/*
- * For a given cpuset cur, partition the system as follows
- * a. All cpus in the parent cpuset's cpus_allowed that are not part of any
- * exclusive child cpusets
- * b. All cpus in the current cpuset's cpus_allowed that are not part of any
- * exclusive child cpusets
- * Build these two partitions by calling partition_sched_domains
- *
- * Call with manage_mutex held. May nest a call to the
- * lock_cpu_hotplug()/unlock_cpu_hotplug() pair.
- * Must not be called holding callback_mutex, because we must
- * not call lock_cpu_hotplug() while holding callback_mutex.
- */
-
-static void update_cpu_domains(struct cpuset *cur)
-{
- struct cpuset *c, *par = cur->parent;
- cpumask_t pspan, cspan;
-
- if (par == NULL || cpus_empty(cur->cpus_allowed))
- return;
-
- /*
- * Get all cpus from parent's cpus_allowed not part of exclusive
- * children
- */
- pspan = par->cpus_allowed;
- list_for_each_entry(c, &par->children, sibling) {
- if (is_cpu_exclusive(c))
- cpus_andnot(pspan, pspan, c->cpus_allowed);
- }
- if (!is_cpu_exclusive(cur)) {
- cpus_or(pspan, pspan, cur->cpus_allowed);
- if (cpus_equal(pspan, cur->cpus_allowed))
- return;
- cspan = CPU_MASK_NONE;
- } else {
- if (cpus_empty(pspan))
- return;
- cspan = cur->cpus_allowed;
- /*
- * Get all cpus from current cpuset's cpus_allowed not part
- * of exclusive children
- */
- list_for_each_entry(c, &cur->children, sibling) {
- if (is_cpu_exclusive(c))
- cpus_andnot(cspan, cspan, c->cpus_allowed);
- }
- }
-
- lock_cpu_hotplug();
- partition_sched_domains(&pspan, &cspan);
- unlock_cpu_hotplug();
-}
-
-/*
* Call with manage_mutex held. May take callback_mutex during call.
*/
static int update_cpumask(struct cpuset *cs, char *buf)
{
struct cpuset trialcs;
- int retval, cpus_unchanged;
+ int retval;
/* top_cpuset.cpus_allowed tracks cpu_online_map; it's read-only */
if (cs == &top_cpuset)
@@ -841,12 +788,9 @@ static int update_cpumask(struct cpuset *cs, char *buf)
retval = validate_change(cs, &trialcs);
if (retval < 0)
return retval;
- cpus_unchanged = cpus_equal(cs->cpus_allowed, trialcs.cpus_allowed);
mutex_lock(&callback_mutex);
cs->cpus_allowed = trialcs.cpus_allowed;
mutex_unlock(&callback_mutex);
- if (is_cpu_exclusive(cs) && !cpus_unchanged)
- update_cpu_domains(cs);
return 0;
}
@@ -924,7 +868,10 @@ static int update_nodemask(struct cpuset *cs, char *buf)
int fudge;
int retval;
- /* top_cpuset.mems_allowed tracks node_online_map; it's read-only */
+ /*
+ * top_cpuset.mems_allowed tracks node_stats[N_HIGH_MEMORY];
+ * it's read-only
+ */
if (cs == &top_cpuset)
return -EACCES;
@@ -941,8 +888,21 @@ static int update_nodemask(struct cpuset *cs, char *buf)
retval = nodelist_parse(buf, trialcs.mems_allowed);
if (retval < 0)
goto done;
+ if (!nodes_intersects(trialcs.mems_allowed,
+ node_states[N_HIGH_MEMORY])) {
+ /*
+ * error if only memoryless nodes specified.
+ */
+ retval = -ENOSPC;
+ goto done;
+ }
}
- nodes_and(trialcs.mems_allowed, trialcs.mems_allowed, node_online_map);
+ /*
+ * Exclude memoryless nodes. We know that trialcs.mems_allowed
+ * contains at least one node with memory.
+ */
+ nodes_and(trialcs.mems_allowed, trialcs.mems_allowed,
+ node_states[N_HIGH_MEMORY]);
oldmem = cs->mems_allowed;
if (nodes_equal(oldmem, trialcs.mems_allowed)) {
retval = 0; /* Too easy - nothing to do */
@@ -1067,7 +1027,7 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs, char *buf)
{
int turning_on;
struct cpuset trialcs;
- int err, cpu_exclusive_changed;
+ int err;
turning_on = (simple_strtoul(buf, NULL, 10) != 0);
@@ -1080,14 +1040,10 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs, char *buf)
err = validate_change(cs, &trialcs);
if (err < 0)
return err;
- cpu_exclusive_changed =
- (is_cpu_exclusive(cs) != is_cpu_exclusive(&trialcs));
mutex_lock(&callback_mutex);
cs->flags = trialcs.flags;
mutex_unlock(&callback_mutex);
- if (cpu_exclusive_changed)
- update_cpu_domains(cs);
return 0;
}
@@ -1445,7 +1401,7 @@ static ssize_t cpuset_common_file_read(struct file *file, char __user *buf,
ssize_t retval = 0;
char *s;
- if (!(page = (char *)__get_free_page(GFP_KERNEL)))
+ if (!(page = (char *)__get_free_page(GFP_TEMPORARY)))
return -ENOMEM;
s = page;
@@ -1947,17 +1903,6 @@ static int cpuset_mkdir(struct inode *dir, struct dentry *dentry, int mode)
return cpuset_create(c_parent, dentry->d_name.name, mode | S_IFDIR);
}
-/*
- * Locking note on the strange update_flag() call below:
- *
- * If the cpuset being removed is marked cpu_exclusive, then simulate
- * turning cpu_exclusive off, which will call update_cpu_domains().
- * The lock_cpu_hotplug() call in update_cpu_domains() must not be
- * made while holding callback_mutex. Elsewhere the kernel nests
- * callback_mutex inside lock_cpu_hotplug() calls. So the reverse
- * nesting would risk an ABBA deadlock.
- */
-
static int cpuset_rmdir(struct inode *unused_dir, struct dentry *dentry)
{
struct cpuset *cs = dentry->d_fsdata;
@@ -1977,13 +1922,6 @@ static int cpuset_rmdir(struct inode *unused_dir, struct dentry *dentry)
mutex_unlock(&manage_mutex);
return -EBUSY;
}
- if (is_cpu_exclusive(cs)) {
- int retval = update_flag(CS_CPU_EXCLUSIVE, cs, "0");
- if (retval < 0) {
- mutex_unlock(&manage_mutex);
- return retval;
- }
- }
parent = cs->parent;
mutex_lock(&callback_mutex);
set_bit(CS_REMOVED, &cs->flags);
@@ -2098,8 +2036,9 @@ static void guarantee_online_cpus_mems_in_subtree(const struct cpuset *cur)
/*
* The cpus_allowed and mems_allowed nodemasks in the top_cpuset track
- * cpu_online_map and node_online_map. Force the top cpuset to track
- * whats online after any CPU or memory node hotplug or unplug event.
+ * cpu_online_map and node_states[N_HIGH_MEMORY]. Force the top cpuset to
+ * track what's online after any CPU or memory node hotplug or unplug
+ * event.
*
* To ensure that we don't remove a CPU or node from the top cpuset
* that is currently in use by a child cpuset (which would violate
@@ -2119,7 +2058,7 @@ static void common_cpu_mem_hotplug_unplug(void)
guarantee_online_cpus_mems_in_subtree(&top_cpuset);
top_cpuset.cpus_allowed = cpu_online_map;
- top_cpuset.mems_allowed = node_online_map;
+ top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
mutex_unlock(&callback_mutex);
mutex_unlock(&manage_mutex);
@@ -2147,8 +2086,9 @@ static int cpuset_handle_cpuhp(struct notifier_block *nb,
#ifdef CONFIG_MEMORY_HOTPLUG
/*
- * Keep top_cpuset.mems_allowed tracking node_online_map.
- * Call this routine anytime after you change node_online_map.
+ * Keep top_cpuset.mems_allowed tracking node_states[N_HIGH_MEMORY].
+ * Call this routine anytime after you change
+ * node_states[N_HIGH_MEMORY].
* See also the previous routine cpuset_handle_cpuhp().
*/
@@ -2167,7 +2107,7 @@ void cpuset_track_online_nodes(void)
void __init cpuset_init_smp(void)
{
top_cpuset.cpus_allowed = cpu_online_map;
- top_cpuset.mems_allowed = node_online_map;
+ top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
hotcpu_notifier(cpuset_handle_cpuhp, 0);
}
@@ -2309,7 +2249,7 @@ void cpuset_init_current_mems_allowed(void)
*
* Description: Returns the nodemask_t mems_allowed of the cpuset
* attached to the specified @tsk. Guaranteed to return some non-empty
- * subset of node_online_map, even if this means going outside the
+ * subset of node_states[N_HIGH_MEMORY], even if this means going outside the
* tasks cpuset.
**/
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 81e69782963..09e9574eeb2 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -119,7 +119,7 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
* No locking available for sched_info (and too expensive to add one)
* Mitigate by taking snapshot of values
*/
- t1 = tsk->sched_info.pcnt;
+ t1 = tsk->sched_info.pcount;
t2 = tsk->sched_info.run_delay;
t3 = tsk->sched_info.cpu_time;
diff --git a/kernel/exit.c b/kernel/exit.c
index 993369ee94d..7f7959de4a8 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -111,6 +111,7 @@ static void __exit_signal(struct task_struct *tsk)
*/
sig->utime = cputime_add(sig->utime, tsk->utime);
sig->stime = cputime_add(sig->stime, tsk->stime);
+ sig->gtime = cputime_add(sig->gtime, tsk->gtime);
sig->min_flt += tsk->min_flt;
sig->maj_flt += tsk->maj_flt;
sig->nvcsw += tsk->nvcsw;
@@ -1242,6 +1243,11 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
cputime_add(p->stime,
cputime_add(sig->stime,
sig->cstime)));
+ psig->cgtime =
+ cputime_add(psig->cgtime,
+ cputime_add(p->gtime,
+ cputime_add(sig->gtime,
+ sig->cgtime)));
psig->cmin_flt +=
p->min_flt + sig->min_flt + sig->cmin_flt;
psig->cmaj_flt +=
diff --git a/kernel/fork.c b/kernel/fork.c
index 5e67f90a169..3fc3c138391 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -877,6 +877,8 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
sig->tty_old_pgrp = NULL;
sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
+ sig->gtime = cputime_zero;
+ sig->cgtime = cputime_zero;
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
@@ -1045,6 +1047,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->utime = cputime_zero;
p->stime = cputime_zero;
+ p->gtime = cputime_zero;
#ifdef CONFIG_TASK_XACCT
p->rchar = 0; /* I/O counter: bytes read */
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 4b8a4493c54..e3a5d817ac9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -64,7 +64,6 @@
static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
-static atomic_t kprobe_count;
/* NOTE: change this value only with kprobe_mutex held */
static bool kprobe_enabled;
@@ -73,11 +72,6 @@ DEFINE_MUTEX(kprobe_mutex); /* Protects kprobe_table */
DEFINE_SPINLOCK(kretprobe_lock); /* Protects kretprobe_inst_table */
static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
-static struct notifier_block kprobe_page_fault_nb = {
- .notifier_call = kprobe_exceptions_notify,
- .priority = 0x7fffffff /* we need to notified first */
-};
-
#ifdef __ARCH_WANT_KPROBES_INSN_SLOT
/*
* kprobe->ainsn.insn points to the copy of the instruction to be
@@ -556,8 +550,6 @@ static int __kprobes __register_kprobe(struct kprobe *p,
old_p = get_kprobe(p->addr);
if (old_p) {
ret = register_aggr_kprobe(old_p, p);
- if (!ret)
- atomic_inc(&kprobe_count);
goto out;
}
@@ -569,13 +561,9 @@ static int __kprobes __register_kprobe(struct kprobe *p,
hlist_add_head_rcu(&p->hlist,
&kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]);
- if (kprobe_enabled) {
- if (atomic_add_return(1, &kprobe_count) == \
- (ARCH_INACTIVE_KPROBE_COUNT + 1))
- register_page_fault_notifier(&kprobe_page_fault_nb);
-
+ if (kprobe_enabled)
arch_arm_kprobe(p);
- }
+
out:
mutex_unlock(&kprobe_mutex);
@@ -658,16 +646,6 @@ valid_p:
}
mutex_unlock(&kprobe_mutex);
}
-
- /* Call unregister_page_fault_notifier()
- * if no probes are active
- */
- mutex_lock(&kprobe_mutex);
- if (atomic_add_return(-1, &kprobe_count) == \
- ARCH_INACTIVE_KPROBE_COUNT)
- unregister_page_fault_notifier(&kprobe_page_fault_nb);
- mutex_unlock(&kprobe_mutex);
- return;
}
static struct notifier_block kprobe_exceptions_nb = {
@@ -738,6 +716,18 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
int ret = 0;
struct kretprobe_instance *inst;
int i;
+ void *addr = rp->kp.addr;
+
+ if (kretprobe_blacklist_size) {
+ if (addr == NULL)
+ kprobe_lookup_name(rp->kp.symbol_name, addr);
+ addr += rp->kp.offset;
+
+ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) {
+ if (kretprobe_blacklist[i].addr == addr)
+ return -EINVAL;
+ }
+ }
rp->kp.pre_handler = pre_handler_kretprobe;
rp->kp.post_handler = NULL;
@@ -815,7 +805,17 @@ static int __init init_kprobes(void)
INIT_HLIST_HEAD(&kprobe_table[i]);
INIT_HLIST_HEAD(&kretprobe_inst_table[i]);
}
- atomic_set(&kprobe_count, 0);
+
+ if (kretprobe_blacklist_size) {
+ /* lookup the function address from its name */
+ for (i = 0; kretprobe_blacklist[i].name != NULL; i++) {
+ kprobe_lookup_name(kretprobe_blacklist[i].name,
+ kretprobe_blacklist[i].addr);
+ if (!kretprobe_blacklist[i].addr)
+ printk("kretprobe: lookup failed: %s\n",
+ kretprobe_blacklist[i].name);
+ }
+ }
/* By default, kprobes are enabled */
kprobe_enabled = true;
@@ -921,13 +921,6 @@ static void __kprobes enable_all_kprobes(void)
if (kprobe_enabled)
goto already_enabled;
- /*
- * Re-register the page fault notifier only if there are any
- * active probes at the time of enabling kprobes globally
- */
- if (atomic_read(&kprobe_count) > ARCH_INACTIVE_KPROBE_COUNT)
- register_page_fault_notifier(&kprobe_page_fault_nb);
-
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
hlist_for_each_entry_rcu(p, node, head, hlist)
@@ -968,10 +961,7 @@ static void __kprobes disable_all_kprobes(void)
mutex_unlock(&kprobe_mutex);
/* Allow all currently running kprobes to complete */
synchronize_sched();
-
- mutex_lock(&kprobe_mutex);
- /* Unconditionally unregister the page_fault notifier */
- unregister_page_fault_notifier(&kprobe_page_fault_nb);
+ return;
already_disabled:
mutex_unlock(&kprobe_mutex);
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index d0e5c48e18c..6046939d080 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kexec.h>
+#include <linux/sched.h>
#define KERNEL_ATTR_RO(_name) \
static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
@@ -116,6 +117,13 @@ static int __init ksysfs_init(void)
&notes_attr);
}
+ /*
+ * Create "/sys/kernel/uids" directory and corresponding root user's
+ * directory under it.
+ */
+ if (!error)
+ error = uids_kobject_init();
+
return error;
}
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 734da579ad1..a6f1ee9c92d 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -1521,7 +1521,7 @@ cache_hit:
}
static int validate_chain(struct task_struct *curr, struct lockdep_map *lock,
- struct held_lock *hlock, int chain_head)
+ struct held_lock *hlock, int chain_head, u64 chain_key)
{
/*
* Trylock needs to maintain the stack of held locks, but it
@@ -1534,7 +1534,7 @@ static int validate_chain(struct task_struct *curr, struct lockdep_map *lock,
* graph_lock for us)
*/
if (!hlock->trylock && (hlock->check == 2) &&
- lookup_chain_cache(curr->curr_chain_key, hlock->class)) {
+ lookup_chain_cache(chain_key, hlock->class)) {
/*
* Check whether last held lock:
*
@@ -1576,7 +1576,7 @@ static int validate_chain(struct task_struct *curr, struct lockdep_map *lock,
#else
static inline int validate_chain(struct task_struct *curr,
struct lockdep_map *lock, struct held_lock *hlock,
- int chain_head)
+ int chain_head, u64 chain_key)
{
return 1;
}
@@ -2450,11 +2450,11 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
chain_head = 1;
}
chain_key = iterate_chain_key(chain_key, id);
- curr->curr_chain_key = chain_key;
- if (!validate_chain(curr, lock, hlock, chain_head))
+ if (!validate_chain(curr, lock, hlock, chain_head, chain_key))
return 0;
+ curr->curr_chain_key = chain_key;
curr->lockdep_depth++;
check_chain_key(curr);
#ifdef CONFIG_DEBUG_LOCKDEP
@@ -3199,3 +3199,19 @@ void debug_show_held_locks(struct task_struct *task)
}
EXPORT_SYMBOL_GPL(debug_show_held_locks);
+
+void lockdep_sys_exit(void)
+{
+ struct task_struct *curr = current;
+
+ if (unlikely(curr->lockdep_depth)) {
+ if (!debug_locks_off())
+ return;
+ printk("\n================================================\n");
+ printk( "[ BUG: lock held when returning to user space! ]\n");
+ printk( "------------------------------------------------\n");
+ printk("%s/%d is leaving the kernel with locks still held!\n",
+ curr->comm, curr->pid);
+ lockdep_print_held_locks(curr);
+ }
+}
diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index c851b2dcc68..8a135bd163c 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -25,28 +25,38 @@
static void *l_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct lock_class *class = v;
+ struct lock_class *class;
(*pos)++;
- if (class->lock_entry.next != &all_lock_classes)
- class = list_entry(class->lock_entry.next, struct lock_class,
- lock_entry);
- else
- class = NULL;
- m->private = class;
+ if (v == SEQ_START_TOKEN)
+ class = m->private;
+ else {
+ class = v;
+
+ if (class->lock_entry.next != &all_lock_classes)
+ class = list_entry(class->lock_entry.next,
+ struct lock_class, lock_entry);
+ else
+ class = NULL;
+ }
return class;
}
static void *l_start(struct seq_file *m, loff_t *pos)
{
- struct lock_class *class = m->private;
+ struct lock_class *class;
+ loff_t i = 0;
- if (&class->lock_entry == all_lock_classes.next)
- seq_printf(m, "all lock classes:\n");
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
- return class;
+ list_for_each_entry(class, &all_lock_classes, lock_entry) {
+ if (++i == *pos)
+ return class;
+ }
+ return NULL;
}
static void l_stop(struct seq_file *m, void *v)
@@ -101,10 +111,15 @@ static void print_name(struct seq_file *m, struct lock_class *class)
static int l_show(struct seq_file *m, void *v)
{
unsigned long nr_forward_deps, nr_backward_deps;
- struct lock_class *class = m->private;
+ struct lock_class *class = v;
struct lock_list *entry;
char c1, c2, c3, c4;
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(m, "all lock classes:\n");
+ return 0;
+ }
+
seq_printf(m, "%p", class->key);
#ifdef CONFIG_DEBUG_LOCKDEP
seq_printf(m, " OPS:%8ld", class->ops);
@@ -523,10 +538,11 @@ static void *ls_start(struct seq_file *m, loff_t *pos)
{
struct lock_stat_seq *data = m->private;
- if (data->iter == data->stats)
- seq_header(m);
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
- if (data->iter == data->iter_end)
+ data->iter = data->stats + *pos;
+ if (data->iter >= data->iter_end)
data->iter = NULL;
return data->iter;
@@ -538,8 +554,13 @@ static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
(*pos)++;
- data->iter = v;
- data->iter++;
+ if (v == SEQ_START_TOKEN)
+ data->iter = data->stats;
+ else {
+ data->iter = v;
+ data->iter++;
+ }
+
if (data->iter == data->iter_end)
data->iter = NULL;
@@ -552,9 +573,11 @@ static void ls_stop(struct seq_file *m, void *v)
static int ls_show(struct seq_file *m, void *v)
{
- struct lock_stat_seq *data = m->private;
+ if (v == SEQ_START_TOKEN)
+ seq_header(m);
+ else
+ seq_stats(m, v);
- seq_stats(m, data->iter);
return 0;
}
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 691b86564dd..d7fe50cc556 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -51,6 +51,7 @@ __mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key)
EXPORT_SYMBOL(__mutex_init);
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
/*
* We split the mutex lock/unlock logic into separate fastpath and
* slowpath functions, to reduce the register pressure on the fastpath.
@@ -92,6 +93,7 @@ void inline fastcall __sched mutex_lock(struct mutex *lock)
}
EXPORT_SYMBOL(mutex_lock);
+#endif
static void fastcall noinline __sched
__mutex_unlock_slowpath(atomic_t *lock_count);
@@ -122,7 +124,8 @@ EXPORT_SYMBOL(mutex_unlock);
* Lock a mutex (possibly interruptible), slowpath:
*/
static inline int __sched
-__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
+__mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
+ unsigned long ip)
{
struct task_struct *task = current;
struct mutex_waiter waiter;
@@ -132,7 +135,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
spin_lock_mutex(&lock->wait_lock, flags);
debug_mutex_lock_common(lock, &waiter);
- mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+ mutex_acquire(&lock->dep_map, subclass, 0, ip);
debug_mutex_add_waiter(lock, &waiter, task_thread_info(task));
/* add waiting tasks to the end of the waitqueue (FIFO): */
@@ -143,7 +146,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
if (old_val == 1)
goto done;
- lock_contended(&lock->dep_map, _RET_IP_);
+ lock_contended(&lock->dep_map, ip);
for (;;) {
/*
@@ -166,7 +169,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass)
if (unlikely(state == TASK_INTERRUPTIBLE &&
signal_pending(task))) {
mutex_remove_waiter(lock, &waiter, task_thread_info(task));
- mutex_release(&lock->dep_map, 1, _RET_IP_);
+ mutex_release(&lock->dep_map, 1, ip);
spin_unlock_mutex(&lock->wait_lock, flags);
debug_mutex_free_waiter(&waiter);
@@ -197,20 +200,12 @@ done:
return 0;
}
-static void fastcall noinline __sched
-__mutex_lock_slowpath(atomic_t *lock_count)
-{
- struct mutex *lock = container_of(lock_count, struct mutex, count);
-
- __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0);
-}
-
#ifdef CONFIG_DEBUG_LOCK_ALLOC
void __sched
mutex_lock_nested(struct mutex *lock, unsigned int subclass)
{
might_sleep();
- __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass);
+ __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, subclass, _RET_IP_);
}
EXPORT_SYMBOL_GPL(mutex_lock_nested);
@@ -219,7 +214,7 @@ int __sched
mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass)
{
might_sleep();
- return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass);
+ return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass, _RET_IP_);
}
EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested);
@@ -271,6 +266,7 @@ __mutex_unlock_slowpath(atomic_t *lock_count)
__mutex_unlock_common_slowpath(lock_count, 1);
}
+#ifndef CONFIG_DEBUG_LOCK_ALLOC
/*
* Here come the less common (and hence less performance-critical) APIs:
* mutex_lock_interruptible() and mutex_trylock().
@@ -298,13 +294,22 @@ int fastcall __sched mutex_lock_interruptible(struct mutex *lock)
EXPORT_SYMBOL(mutex_lock_interruptible);
+static void fastcall noinline __sched
+__mutex_lock_slowpath(atomic_t *lock_count)
+{
+ struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+ __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0, _RET_IP_);
+}
+
static int fastcall noinline __sched
__mutex_lock_interruptible_slowpath(atomic_t *lock_count)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);
- return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0);
+ return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, 0, _RET_IP_);
}
+#endif
/*
* Spinlock based trylock, we take the spinlock and check whether we
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 7a15afb73ed..57efe0400bc 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -712,7 +712,7 @@ sys_timer_getoverrun(timer_t timer_id)
{
struct k_itimer *timr;
int overrun;
- long flags;
+ unsigned long flags;
timr = lock_timer(timer_id, &flags);
if (!timr)
@@ -784,7 +784,7 @@ sys_timer_settime(timer_t timer_id, int flags,
struct k_itimer *timr;
struct itimerspec new_spec, old_spec;
int error = 0;
- long flag;
+ unsigned long flag;
struct itimerspec *rtn = old_setting ? &old_spec : NULL;
if (!new_setting)
@@ -836,7 +836,7 @@ asmlinkage long
sys_timer_delete(timer_t timer_id)
{
struct k_itimer *timer;
- long flags;
+ unsigned long flags;
retry_delete:
timer = lock_timer(timer_id, &flags);
diff --git a/kernel/printk.c b/kernel/printk.c
index 8451dfc31d2..b2b5c3a22a3 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -22,6 +22,8 @@
#include <linux/tty_driver.h>
#include <linux/console.h>
#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/nmi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h> /* For in_interrupt() */
@@ -162,6 +164,61 @@ out:
__setup("log_buf_len=", log_buf_len_setup);
+#ifdef CONFIG_BOOT_PRINTK_DELAY
+
+static unsigned int boot_delay; /* msecs delay after each printk during bootup */
+static unsigned long long printk_delay_msec; /* per msec, based on boot_delay */
+
+static int __init boot_delay_setup(char *str)
+{
+ unsigned long lpj;
+ unsigned long long loops_per_msec;
+
+ lpj = preset_lpj ? preset_lpj : 1000000; /* some guess */
+ loops_per_msec = (unsigned long long)lpj / 1000 * HZ;
+
+ get_option(&str, &boot_delay);
+ if (boot_delay > 10 * 1000)
+ boot_delay = 0;
+
+ printk_delay_msec = loops_per_msec;
+ printk(KERN_DEBUG "boot_delay: %u, preset_lpj: %ld, lpj: %lu, "
+ "HZ: %d, printk_delay_msec: %llu\n",
+ boot_delay, preset_lpj, lpj, HZ, printk_delay_msec);
+ return 1;
+}
+__setup("boot_delay=", boot_delay_setup);
+
+static void boot_delay_msec(void)
+{
+ unsigned long long k;
+ unsigned long timeout;
+
+ if (boot_delay == 0 || system_state != SYSTEM_BOOTING)
+ return;
+
+ k = (unsigned long long)printk_delay_msec * boot_delay;
+
+ timeout = jiffies + msecs_to_jiffies(boot_delay);
+ while (k) {
+ k--;
+ cpu_relax();
+ /*
+ * use (volatile) jiffies to prevent
+ * compiler reduction; loop termination via jiffies
+ * is secondary and may or may not happen.
+ */
+ if (time_after(jiffies, timeout))
+ break;
+ touch_nmi_watchdog();
+ }
+}
+#else
+static inline void boot_delay_msec(void)
+{
+}
+#endif
+
/*
* Commands to do_syslog:
*
@@ -527,6 +584,8 @@ asmlinkage int vprintk(const char *fmt, va_list args)
static char printk_buf[1024];
static int log_level_unknown = 1;
+ boot_delay_msec();
+
preempt_disable();
if (unlikely(oops_in_progress) && printk_cpu == smp_processor_id())
/* If a crash is occurring during printk() on this CPU,
diff --git a/kernel/profile.c b/kernel/profile.c
index cb1e37d2dac..6f69bf792d9 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -346,7 +346,7 @@ static int __devinit profile_cpu_callback(struct notifier_block *info,
per_cpu(cpu_profile_flip, cpu) = 0;
if (!per_cpu(cpu_profile_hits, cpu)[1]) {
page = alloc_pages_node(node,
- GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
+ GFP_KERNEL | __GFP_ZERO,
0);
if (!page)
return NOTIFY_BAD;
@@ -354,7 +354,7 @@ static int __devinit profile_cpu_callback(struct notifier_block *info,
}
if (!per_cpu(cpu_profile_hits, cpu)[0]) {
page = alloc_pages_node(node,
- GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
+ GFP_KERNEL | __GFP_ZERO,
0);
if (!page)
goto out_free;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 3eca7a55f2e..a73ebd3b9d4 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -386,6 +386,9 @@ int ptrace_request(struct task_struct *child, long request,
case PTRACE_SETSIGINFO:
ret = ptrace_setsiginfo(child, (siginfo_t __user *) data);
break;
+ case PTRACE_DETACH: /* detach a process that was attached. */
+ ret = ptrace_detach(child, data);
+ break;
default:
break;
}
@@ -450,6 +453,10 @@ struct task_struct *ptrace_get_task_struct(pid_t pid)
return child;
}
+#ifndef arch_ptrace_attach
+#define arch_ptrace_attach(child) do { } while (0)
+#endif
+
#ifndef __ARCH_SYS_PTRACE
asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
{
@@ -473,6 +480,12 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
if (request == PTRACE_ATTACH) {
ret = ptrace_attach(child);
+ /*
+ * Some architectures need to do book-keeping after
+ * a ptrace attach.
+ */
+ if (!ret)
+ arch_ptrace_attach(child);
goto out_put_task_struct;
}
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 2c2dd8410dc..130214f3d22 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -49,6 +49,14 @@
#include <linux/cpu.h>
#include <linux/mutex.h>
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key rcu_lock_key;
+struct lockdep_map rcu_lock_map =
+ STATIC_LOCKDEP_MAP_INIT("rcu_read_lock", &rcu_lock_key);
+
+EXPORT_SYMBOL_GPL(rcu_lock_map);
+#endif
+
/* Definition for rcupdate control block. */
static struct rcu_ctrlblk rcu_ctrlblk = {
.cur = -300,
diff --git a/kernel/resource.c b/kernel/resource.c
index 9bd14fd3e6d..a358142ff48 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -234,7 +234,7 @@ EXPORT_SYMBOL(release_resource);
* the caller must specify res->start, res->end, res->flags.
* If found, returns 0, res is overwritten, if not found, returns -1.
*/
-int find_next_system_ram(struct resource *res)
+static int find_next_system_ram(struct resource *res)
{
resource_size_t start, end;
struct resource *p;
@@ -267,6 +267,30 @@ int find_next_system_ram(struct resource *res)
res->end = p->end;
return 0;
}
+int
+walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
+ int (*func)(unsigned long, unsigned long, void *))
+{
+ struct resource res;
+ unsigned long pfn, len;
+ u64 orig_end;
+ int ret = -1;
+ res.start = (u64) start_pfn << PAGE_SHIFT;
+ res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1;
+ res.flags = IORESOURCE_MEM;
+ orig_end = res.end;
+ while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) {
+ pfn = (unsigned long)(res.start >> PAGE_SHIFT);
+ len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT);
+ ret = (*func)(pfn, len, arg);
+ if (ret)
+ break;
+ res.start = res.end + 1;
+ res.end = orig_end;
+ }
+ return ret;
+}
+
#endif
/*
diff --git a/kernel/sched.c b/kernel/sched.c
index 6c10fa796ca..0da2b2635c5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -96,7 +96,7 @@ unsigned long long __attribute__((weak)) sched_clock(void)
/*
* Some helpers for converting nanosecond timing to jiffy resolution
*/
-#define NS_TO_JIFFIES(TIME) ((TIME) / (1000000000 / HZ))
+#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (1000000000 / HZ))
#define JIFFIES_TO_NS(TIME) ((TIME) * (1000000000 / HZ))
#define NICE_0_LOAD SCHED_LOAD_SCALE
@@ -105,11 +105,9 @@ unsigned long long __attribute__((weak)) sched_clock(void)
/*
* These are the 'tuning knobs' of the scheduler:
*
- * Minimum timeslice is 5 msecs (or 1 jiffy, whichever is larger),
- * default timeslice is 100 msecs, maximum timeslice is 800 msecs.
+ * default timeslice is 100 msecs (used only for SCHED_RR tasks).
* Timeslices get refilled after they expire.
*/
-#define MIN_TIMESLICE max(5 * HZ / 1000, 1)
#define DEF_TIMESLICE (100 * HZ / 1000)
#ifdef CONFIG_SMP
@@ -133,24 +131,6 @@ static inline void sg_inc_cpu_power(struct sched_group *sg, u32 val)
}
#endif
-#define SCALE_PRIO(x, prio) \
- max(x * (MAX_PRIO - prio) / (MAX_USER_PRIO / 2), MIN_TIMESLICE)
-
-/*
- * static_prio_timeslice() scales user-nice values [ -20 ... 0 ... 19 ]
- * to time slice values: [800ms ... 100ms ... 5ms]
- */
-static unsigned int static_prio_timeslice(int static_prio)
-{
- if (static_prio == NICE_TO_PRIO(19))
- return 1;
-
- if (static_prio < NICE_TO_PRIO(0))
- return SCALE_PRIO(DEF_TIMESLICE * 4, static_prio);
- else
- return SCALE_PRIO(DEF_TIMESLICE, static_prio);
-}
-
static inline int rt_policy(int policy)
{
if (unlikely(policy == SCHED_FIFO) || unlikely(policy == SCHED_RR))
@@ -171,31 +151,91 @@ struct rt_prio_array {
struct list_head queue[MAX_RT_PRIO];
};
-struct load_stat {
- struct load_weight load;
- u64 load_update_start, load_update_last;
- unsigned long delta_fair, delta_exec, delta_stat;
+#ifdef CONFIG_FAIR_GROUP_SCHED
+
+struct cfs_rq;
+
+/* task group related information */
+struct task_group {
+ /* schedulable entities of this group on each cpu */
+ struct sched_entity **se;
+ /* runqueue "owned" by this group on each cpu */
+ struct cfs_rq **cfs_rq;
+ unsigned long shares;
+ /* spinlock to serialize modification to shares */
+ spinlock_t lock;
+};
+
+/* Default task group's sched entity on each cpu */
+static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
+/* Default task group's cfs_rq on each cpu */
+static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
+
+static struct sched_entity *init_sched_entity_p[NR_CPUS];
+static struct cfs_rq *init_cfs_rq_p[NR_CPUS];
+
+/* Default task group.
+ * Every task in system belong to this group at bootup.
+ */
+struct task_group init_task_group = {
+ .se = init_sched_entity_p,
+ .cfs_rq = init_cfs_rq_p,
};
+#ifdef CONFIG_FAIR_USER_SCHED
+# define INIT_TASK_GRP_LOAD 2*NICE_0_LOAD
+#else
+# define INIT_TASK_GRP_LOAD NICE_0_LOAD
+#endif
+
+static int init_task_group_load = INIT_TASK_GRP_LOAD;
+
+/* return group to which a task belongs */
+static inline struct task_group *task_group(struct task_struct *p)
+{
+ struct task_group *tg;
+
+#ifdef CONFIG_FAIR_USER_SCHED
+ tg = p->user->tg;
+#else
+ tg = &init_task_group;
+#endif
+
+ return tg;
+}
+
+/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
+static inline void set_task_cfs_rq(struct task_struct *p)
+{
+ p->se.cfs_rq = task_group(p)->cfs_rq[task_cpu(p)];
+ p->se.parent = task_group(p)->se[task_cpu(p)];
+}
+
+#else
+
+static inline void set_task_cfs_rq(struct task_struct *p) { }
+
+#endif /* CONFIG_FAIR_GROUP_SCHED */
+
/* CFS-related fields in a runqueue */
struct cfs_rq {
struct load_weight load;
unsigned long nr_running;
- s64 fair_clock;
u64 exec_clock;
- s64 wait_runtime;
- u64 sleeper_bonus;
- unsigned long wait_runtime_overruns, wait_runtime_underruns;
+ u64 min_vruntime;
struct rb_root tasks_timeline;
struct rb_node *rb_leftmost;
struct rb_node *rb_load_balance_curr;
-#ifdef CONFIG_FAIR_GROUP_SCHED
/* 'curr' points to currently running entity on this cfs_rq.
* It is set to NULL otherwise (i.e when none are currently running).
*/
struct sched_entity *curr;
+
+ unsigned long nr_spread_over;
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */
/* leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
@@ -206,6 +246,8 @@ struct cfs_rq {
* list is used during load balance.
*/
struct list_head leaf_cfs_rq_list; /* Better name : task_cfs_rq_list? */
+ struct task_group *tg; /* group that "owns" this runqueue */
+ struct rcu_head rcu;
#endif
};
@@ -237,7 +279,7 @@ struct rq {
#ifdef CONFIG_NO_HZ
unsigned char in_nohz_recently;
#endif
- struct load_stat ls; /* capture load from *all* tasks on this cpu */
+ struct load_weight load; /* capture load from *all* tasks on this cpu */
unsigned long nr_load_updates;
u64 nr_switches;
@@ -289,16 +331,19 @@ struct rq {
unsigned long yld_exp_empty;
unsigned long yld_act_empty;
unsigned long yld_both_empty;
- unsigned long yld_cnt;
+ unsigned long yld_count;
/* schedule() stats */
unsigned long sched_switch;
- unsigned long sched_cnt;
+ unsigned long sched_count;
unsigned long sched_goidle;
/* try_to_wake_up() stats */
- unsigned long ttwu_cnt;
+ unsigned long ttwu_count;
unsigned long ttwu_local;
+
+ /* BKL stats */
+ unsigned long bkl_count;
#endif
struct lock_class_key rq_lock_key;
};
@@ -383,6 +428,37 @@ static void update_rq_clock(struct rq *rq)
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
/*
+ * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
+ */
+#ifdef CONFIG_SCHED_DEBUG
+# define const_debug __read_mostly
+#else
+# define const_debug static const
+#endif
+
+/*
+ * Debugging: various feature bits
+ */
+enum {
+ SCHED_FEAT_NEW_FAIR_SLEEPERS = 1,
+ SCHED_FEAT_START_DEBIT = 2,
+ SCHED_FEAT_TREE_AVG = 4,
+ SCHED_FEAT_APPROX_AVG = 8,
+ SCHED_FEAT_WAKEUP_PREEMPT = 16,
+ SCHED_FEAT_PREEMPT_RESTRICT = 32,
+};
+
+const_debug unsigned int sysctl_sched_features =
+ SCHED_FEAT_NEW_FAIR_SLEEPERS *1 |
+ SCHED_FEAT_START_DEBIT *1 |
+ SCHED_FEAT_TREE_AVG *0 |
+ SCHED_FEAT_APPROX_AVG *0 |
+ SCHED_FEAT_WAKEUP_PREEMPT *1 |
+ SCHED_FEAT_PREEMPT_RESTRICT *1;
+
+#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
+
+/*
* For kernel-internal use: high-speed (but slightly incorrect) per-cpu
* clock constructed from sched_clock():
*/
@@ -400,18 +476,7 @@ unsigned long long cpu_clock(int cpu)
return now;
}
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-/* Change a task's ->cfs_rq if it moves across CPUs */
-static inline void set_task_cfs_rq(struct task_struct *p)
-{
- p->se.cfs_rq = &task_rq(p)->cfs;
-}
-#else
-static inline void set_task_cfs_rq(struct task_struct *p)
-{
-}
-#endif
+EXPORT_SYMBOL_GPL(cpu_clock);
#ifndef prepare_arch_switch
# define prepare_arch_switch(next) do { } while (0)
@@ -497,16 +562,13 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
static inline struct rq *__task_rq_lock(struct task_struct *p)
__acquires(rq->lock)
{
- struct rq *rq;
-
-repeat_lock_task:
- rq = task_rq(p);
- spin_lock(&rq->lock);
- if (unlikely(rq != task_rq(p))) {
+ for (;;) {
+ struct rq *rq = task_rq(p);
+ spin_lock(&rq->lock);
+ if (likely(rq == task_rq(p)))
+ return rq;
spin_unlock(&rq->lock);
- goto repeat_lock_task;
}
- return rq;
}
/*
@@ -519,18 +581,17 @@ static struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
{
struct rq *rq;
-repeat_lock_task:
- local_irq_save(*flags);
- rq = task_rq(p);
- spin_lock(&rq->lock);
- if (unlikely(rq != task_rq(p))) {
+ for (;;) {
+ local_irq_save(*flags);
+ rq = task_rq(p);
+ spin_lock(&rq->lock);
+ if (likely(rq == task_rq(p)))
+ return rq;
spin_unlock_irqrestore(&rq->lock, *flags);
- goto repeat_lock_task;
}
- return rq;
}
-static inline void __task_rq_unlock(struct rq *rq)
+static void __task_rq_unlock(struct rq *rq)
__releases(rq->lock)
{
spin_unlock(&rq->lock);
@@ -545,7 +606,7 @@ static inline void task_rq_unlock(struct rq *rq, unsigned long *flags)
/*
* this_rq_lock - lock this runqueue and disable interrupts.
*/
-static inline struct rq *this_rq_lock(void)
+static struct rq *this_rq_lock(void)
__acquires(rq->lock)
{
struct rq *rq;
@@ -645,19 +706,6 @@ static inline void resched_task(struct task_struct *p)
}
#endif
-static u64 div64_likely32(u64 divident, unsigned long divisor)
-{
-#if BITS_PER_LONG == 32
- if (likely(divident <= 0xffffffffULL))
- return (u32)divident / divisor;
- do_div(divident, divisor);
-
- return divident;
-#else
- return divident / divisor;
-#endif
-}
-
#if BITS_PER_LONG == 32
# define WMULT_CONST (~0UL)
#else
@@ -699,16 +747,14 @@ calc_delta_fair(unsigned long delta_exec, struct load_weight *lw)
return calc_delta_mine(delta_exec, NICE_0_LOAD, lw);
}
-static void update_load_add(struct load_weight *lw, unsigned long inc)
+static inline void update_load_add(struct load_weight *lw, unsigned long inc)
{
lw->weight += inc;
- lw->inv_weight = 0;
}
-static void update_load_sub(struct load_weight *lw, unsigned long dec)
+static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
{
lw->weight -= dec;
- lw->inv_weight = 0;
}
/*
@@ -784,29 +830,20 @@ static int balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
int *this_best_prio, struct rq_iterator *iterator);
#include "sched_stats.h"
-#include "sched_rt.c"
-#include "sched_fair.c"
#include "sched_idletask.c"
+#include "sched_fair.c"
+#include "sched_rt.c"
#ifdef CONFIG_SCHED_DEBUG
# include "sched_debug.c"
#endif
#define sched_class_highest (&rt_sched_class)
-static void __update_curr_load(struct rq *rq, struct load_stat *ls)
-{
- if (rq->curr != rq->idle && ls->load.weight) {
- ls->delta_exec += ls->delta_stat;
- ls->delta_fair += calc_delta_fair(ls->delta_stat, &ls->load);
- ls->delta_stat = 0;
- }
-}
-
/*
* Update delta_exec, delta_fair fields for rq.
*
* delta_fair clock advances at a rate inversely proportional to
- * total load (rq->ls.load.weight) on the runqueue, while
+ * total load (rq->load.weight) on the runqueue, while
* delta_exec advances at the same rate as wall-clock (provided
* cpu is not idle).
*
@@ -814,35 +851,17 @@ static void __update_curr_load(struct rq *rq, struct load_stat *ls)
* runqueue over any given interval. This (smoothened) load is used
* during load balance.
*
- * This function is called /before/ updating rq->ls.load
+ * This function is called /before/ updating rq->load
* and when switching tasks.
*/
-static void update_curr_load(struct rq *rq)
-{
- struct load_stat *ls = &rq->ls;
- u64 start;
-
- start = ls->load_update_start;
- ls->load_update_start = rq->clock;
- ls->delta_stat += rq->clock - start;
- /*
- * Stagger updates to ls->delta_fair. Very frequent updates
- * can be expensive.
- */
- if (ls->delta_stat >= sysctl_sched_stat_granularity)
- __update_curr_load(rq, ls);
-}
-
static inline void inc_load(struct rq *rq, const struct task_struct *p)
{
- update_curr_load(rq);
- update_load_add(&rq->ls.load, p->se.load.weight);
+ update_load_add(&rq->load, p->se.load.weight);
}
static inline void dec_load(struct rq *rq, const struct task_struct *p)
{
- update_curr_load(rq);
- update_load_sub(&rq->ls.load, p->se.load.weight);
+ update_load_sub(&rq->load, p->se.load.weight);
}
static void inc_nr_running(struct task_struct *p, struct rq *rq)
@@ -859,8 +878,6 @@ static void dec_nr_running(struct task_struct *p, struct rq *rq)
static void set_load_weight(struct task_struct *p)
{
- p->se.wait_runtime = 0;
-
if (task_has_rt_policy(p)) {
p->se.load.weight = prio_to_weight[0] * 2;
p->se.load.inv_weight = prio_to_wmult[0] >> 1;
@@ -952,20 +969,6 @@ static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
}
/*
- * activate_idle_task - move idle task to the _front_ of runqueue.
- */
-static inline void activate_idle_task(struct task_struct *p, struct rq *rq)
-{
- update_rq_clock(rq);
-
- if (p->state == TASK_UNINTERRUPTIBLE)
- rq->nr_uninterruptible--;
-
- enqueue_task(rq, p, 0);
- inc_nr_running(p, rq);
-}
-
-/*
* deactivate_task - remove a task from the runqueue.
*/
static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
@@ -989,32 +992,50 @@ inline int task_curr(const struct task_struct *p)
/* Used instead of source_load when we know the type == 0 */
unsigned long weighted_cpuload(const int cpu)
{
- return cpu_rq(cpu)->ls.load.weight;
+ return cpu_rq(cpu)->load.weight;
}
static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
{
#ifdef CONFIG_SMP
task_thread_info(p)->cpu = cpu;
- set_task_cfs_rq(p);
#endif
+ set_task_cfs_rq(p);
}
#ifdef CONFIG_SMP
+/*
+ * Is this task likely cache-hot:
+ */
+static inline int
+task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
+{
+ s64 delta;
+
+ if (p->sched_class != &fair_sched_class)
+ return 0;
+
+ if (sysctl_sched_migration_cost == -1)
+ return 1;
+ if (sysctl_sched_migration_cost == 0)
+ return 0;
+
+ delta = now - p->se.exec_start;
+
+ return delta < (s64)sysctl_sched_migration_cost;
+}
+
+
void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
{
int old_cpu = task_cpu(p);
struct rq *old_rq = cpu_rq(old_cpu), *new_rq = cpu_rq(new_cpu);
- u64 clock_offset, fair_clock_offset;
+ struct cfs_rq *old_cfsrq = task_cfs_rq(p),
+ *new_cfsrq = cpu_cfs_rq(old_cfsrq, new_cpu);
+ u64 clock_offset;
clock_offset = old_rq->clock - new_rq->clock;
- fair_clock_offset = old_rq->cfs.fair_clock - new_rq->cfs.fair_clock;
-
- if (p->se.wait_start_fair)
- p->se.wait_start_fair -= fair_clock_offset;
- if (p->se.sleep_start_fair)
- p->se.sleep_start_fair -= fair_clock_offset;
#ifdef CONFIG_SCHEDSTATS
if (p->se.wait_start)
@@ -1023,7 +1044,14 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
p->se.sleep_start -= clock_offset;
if (p->se.block_start)
p->se.block_start -= clock_offset;
+ if (old_cpu != new_cpu) {
+ schedstat_inc(p, se.nr_migrations);
+ if (task_hot(p, old_rq->clock, NULL))
+ schedstat_inc(p, se.nr_forced2_migrations);
+ }
#endif
+ p->se.vruntime -= old_cfsrq->min_vruntime -
+ new_cfsrq->min_vruntime;
__set_task_cpu(p, new_cpu);
}
@@ -1078,69 +1106,71 @@ void wait_task_inactive(struct task_struct *p)
int running, on_rq;
struct rq *rq;
-repeat:
- /*
- * We do the initial early heuristics without holding
- * any task-queue locks at all. We'll only try to get
- * the runqueue lock when things look like they will
- * work out!
- */
- rq = task_rq(p);
+ for (;;) {
+ /*
+ * We do the initial early heuristics without holding
+ * any task-queue locks at all. We'll only try to get
+ * the runqueue lock when things look like they will
+ * work out!
+ */
+ rq = task_rq(p);
- /*
- * If the task is actively running on another CPU
- * still, just relax and busy-wait without holding
- * any locks.
- *
- * NOTE! Since we don't hold any locks, it's not
- * even sure that "rq" stays as the right runqueue!
- * But we don't care, since "task_running()" will
- * return false if the runqueue has changed and p
- * is actually now running somewhere else!
- */
- while (task_running(rq, p))
- cpu_relax();
+ /*
+ * If the task is actively running on another CPU
+ * still, just relax and busy-wait without holding
+ * any locks.
+ *
+ * NOTE! Since we don't hold any locks, it's not
+ * even sure that "rq" stays as the right runqueue!
+ * But we don't care, since "task_running()" will
+ * return false if the runqueue has changed and p
+ * is actually now running somewhere else!
+ */
+ while (task_running(rq, p))
+ cpu_relax();
- /*
- * Ok, time to look more closely! We need the rq
- * lock now, to be *sure*. If we're wrong, we'll
- * just go back and repeat.
- */
- rq = task_rq_lock(p, &flags);
- running = task_running(rq, p);
- on_rq = p->se.on_rq;
- task_rq_unlock(rq, &flags);
+ /*
+ * Ok, time to look more closely! We need the rq
+ * lock now, to be *sure*. If we're wrong, we'll
+ * just go back and repeat.
+ */
+ rq = task_rq_lock(p, &flags);
+ running = task_running(rq, p);
+ on_rq = p->se.on_rq;
+ task_rq_unlock(rq, &flags);
- /*
- * Was it really running after all now that we
- * checked with the proper locks actually held?
- *
- * Oops. Go back and try again..
- */
- if (unlikely(running)) {
- cpu_relax();
- goto repeat;
- }
+ /*
+ * Was it really running after all now that we
+ * checked with the proper locks actually held?
+ *
+ * Oops. Go back and try again..
+ */
+ if (unlikely(running)) {
+ cpu_relax();
+ continue;
+ }
- /*
- * It's not enough that it's not actively running,
- * it must be off the runqueue _entirely_, and not
- * preempted!
- *
- * So if it wa still runnable (but just not actively
- * running right now), it's preempted, and we should
- * yield - it could be a while.
- */
- if (unlikely(on_rq)) {
- yield();
- goto repeat;
- }
+ /*
+ * It's not enough that it's not actively running,
+ * it must be off the runqueue _entirely_, and not
+ * preempted!
+ *
+ * So if it wa still runnable (but just not actively
+ * running right now), it's preempted, and we should
+ * yield - it could be a while.
+ */
+ if (unlikely(on_rq)) {
+ schedule_timeout_uninterruptible(1);
+ continue;
+ }
- /*
- * Ahh, all good. It wasn't running, and it wasn't
- * runnable, which means that it will never become
- * running in the future either. We're all done!
- */
+ /*
+ * Ahh, all good. It wasn't running, and it wasn't
+ * runnable, which means that it will never become
+ * running in the future either. We're all done!
+ */
+ break;
+ }
}
/***
@@ -1174,7 +1204,7 @@ void kick_process(struct task_struct *p)
* We want to under-estimate the load of migration sources, to
* balance conservatively.
*/
-static inline unsigned long source_load(int cpu, int type)
+static unsigned long source_load(int cpu, int type)
{
struct rq *rq = cpu_rq(cpu);
unsigned long total = weighted_cpuload(cpu);
@@ -1189,7 +1219,7 @@ static inline unsigned long source_load(int cpu, int type)
* Return a high guess at the load of a migration-target cpu weighted
* according to the scheduling class and "nice" value.
*/
-static inline unsigned long target_load(int cpu, int type)
+static unsigned long target_load(int cpu, int type)
{
struct rq *rq = cpu_rq(cpu);
unsigned long total = weighted_cpuload(cpu);
@@ -1231,7 +1261,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
/* Skip over this group if it has no CPUs allowed */
if (!cpus_intersects(group->cpumask, p->cpus_allowed))
- goto nextgroup;
+ continue;
local_group = cpu_isset(this_cpu, group->cpumask);
@@ -1259,9 +1289,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
min_load = avg_load;
idlest = group;
}
-nextgroup:
- group = group->next;
- } while (group != sd->groups);
+ } while (group = group->next, group != sd->groups);
if (!idlest || 100*this_load < imbalance*min_load)
return NULL;
@@ -1393,8 +1421,13 @@ static int wake_idle(int cpu, struct task_struct *p)
if (sd->flags & SD_WAKE_IDLE) {
cpus_and(tmp, sd->span, p->cpus_allowed);
for_each_cpu_mask(i, tmp) {
- if (idle_cpu(i))
+ if (idle_cpu(i)) {
+ if (i != task_cpu(p)) {
+ schedstat_inc(p,
+ se.nr_wakeups_idle);
+ }
return i;
+ }
}
} else {
break;
@@ -1425,7 +1458,7 @@ static inline int wake_idle(int cpu, struct task_struct *p)
*/
static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
{
- int cpu, this_cpu, success = 0;
+ int cpu, orig_cpu, this_cpu, success = 0;
unsigned long flags;
long old_state;
struct rq *rq;
@@ -1444,6 +1477,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
goto out_running;
cpu = task_cpu(p);
+ orig_cpu = cpu;
this_cpu = smp_processor_id();
#ifdef CONFIG_SMP
@@ -1452,7 +1486,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
new_cpu = cpu;
- schedstat_inc(rq, ttwu_cnt);
+ schedstat_inc(rq, ttwu_count);
if (cpu == this_cpu) {
schedstat_inc(rq, ttwu_local);
goto out_set_cpu;
@@ -1487,6 +1521,13 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
unsigned long tl = this_load;
unsigned long tl_per_task;
+ /*
+ * Attract cache-cold tasks on sync wakeups:
+ */
+ if (sync && !task_hot(p, rq->clock, this_sd))
+ goto out_set_cpu;
+
+ schedstat_inc(p, se.nr_wakeups_affine_attempts);
tl_per_task = cpu_avg_load_per_task(this_cpu);
/*
@@ -1506,6 +1547,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
* there is no bad imbalance.
*/
schedstat_inc(this_sd, ttwu_move_affine);
+ schedstat_inc(p, se.nr_wakeups_affine);
goto out_set_cpu;
}
}
@@ -1517,6 +1559,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
if (this_sd->flags & SD_WAKE_BALANCE) {
if (imbalance*this_load <= 100*load) {
schedstat_inc(this_sd, ttwu_move_balance);
+ schedstat_inc(p, se.nr_wakeups_passive);
goto out_set_cpu;
}
}
@@ -1542,18 +1585,18 @@ out_set_cpu:
out_activate:
#endif /* CONFIG_SMP */
+ schedstat_inc(p, se.nr_wakeups);
+ if (sync)
+ schedstat_inc(p, se.nr_wakeups_sync);
+ if (orig_cpu != cpu)
+ schedstat_inc(p, se.nr_wakeups_migrate);
+ if (cpu == this_cpu)
+ schedstat_inc(p, se.nr_wakeups_local);
+ else
+ schedstat_inc(p, se.nr_wakeups_remote);
update_rq_clock(rq);
activate_task(rq, p, 1);
- /*
- * Sync wakeups (i.e. those types of wakeups where the waker
- * has indicated that it will leave the CPU in short order)
- * don't trigger a preemption, if the woken up task will run on
- * this cpu. (in this case the 'I will reschedule' promise of
- * the waker guarantees that the freshly woken up task is going
- * to be considered on this CPU.)
- */
- if (!sync || cpu != this_cpu)
- check_preempt_curr(rq, p);
+ check_preempt_curr(rq, p);
success = 1;
out_running:
@@ -1584,28 +1627,20 @@ int fastcall wake_up_state(struct task_struct *p, unsigned int state)
*/
static void __sched_fork(struct task_struct *p)
{
- p->se.wait_start_fair = 0;
p->se.exec_start = 0;
p->se.sum_exec_runtime = 0;
p->se.prev_sum_exec_runtime = 0;
- p->se.delta_exec = 0;
- p->se.delta_fair_run = 0;
- p->se.delta_fair_sleep = 0;
- p->se.wait_runtime = 0;
- p->se.sleep_start_fair = 0;
#ifdef CONFIG_SCHEDSTATS
p->se.wait_start = 0;
- p->se.sum_wait_runtime = 0;
p->se.sum_sleep_runtime = 0;
p->se.sleep_start = 0;
p->se.block_start = 0;
p->se.sleep_max = 0;
p->se.block_max = 0;
p->se.exec_max = 0;
+ p->se.slice_max = 0;
p->se.wait_max = 0;
- p->se.wait_runtime_overruns = 0;
- p->se.wait_runtime_underruns = 0;
#endif
INIT_LIST_HEAD(&p->run_list);
@@ -1636,12 +1671,14 @@ void sched_fork(struct task_struct *p, int clone_flags)
#ifdef CONFIG_SMP
cpu = sched_balance_self(cpu, SD_BALANCE_FORK);
#endif
- __set_task_cpu(p, cpu);
+ set_task_cpu(p, cpu);
/*
* Make sure we do not leak PI boosting priority to the child:
*/
p->prio = current->normal_prio;
+ if (!rt_prio(p->prio))
+ p->sched_class = &fair_sched_class;
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
if (likely(sched_info_on()))
@@ -1658,12 +1695,6 @@ void sched_fork(struct task_struct *p, int clone_flags)
}
/*
- * After fork, child runs first. (default) If set to 0 then
- * parent will (try to) run first.
- */
-unsigned int __read_mostly sysctl_sched_child_runs_first = 1;
-
-/*
* wake_up_new_task - wake up a newly created task for the first time.
*
* This function will do some initial scheduler statistics housekeeping
@@ -1674,24 +1705,14 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
{
unsigned long flags;
struct rq *rq;
- int this_cpu;
rq = task_rq_lock(p, &flags);
BUG_ON(p->state != TASK_RUNNING);
- this_cpu = smp_processor_id(); /* parent's CPU */
update_rq_clock(rq);
p->prio = effective_prio(p);
- if (rt_prio(p->prio))
- p->sched_class = &rt_sched_class;
- else
- p->sched_class = &fair_sched_class;
-
- if (!p->sched_class->task_new || !sysctl_sched_child_runs_first ||
- (clone_flags & CLONE_VM) || task_cpu(p) != this_cpu ||
- !current->se.on_rq) {
-
+ if (!p->sched_class->task_new || !current->se.on_rq || !rq->cfs.curr) {
activate_task(rq, p, 0);
} else {
/*
@@ -1800,7 +1821,7 @@ prepare_task_switch(struct rq *rq, struct task_struct *prev,
* with the lock held can cause deadlocks; see schedule() for
* details.)
*/
-static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
+static void finish_task_switch(struct rq *rq, struct task_struct *prev)
__releases(rq->lock)
{
struct mm_struct *mm = rq->prev_mm;
@@ -1982,42 +2003,10 @@ unsigned long nr_active(void)
*/
static void update_cpu_load(struct rq *this_rq)
{
- u64 fair_delta64, exec_delta64, idle_delta64, sample_interval64, tmp64;
- unsigned long total_load = this_rq->ls.load.weight;
- unsigned long this_load = total_load;
- struct load_stat *ls = &this_rq->ls;
+ unsigned long this_load = this_rq->load.weight;
int i, scale;
this_rq->nr_load_updates++;
- if (unlikely(!(sysctl_sched_features & SCHED_FEAT_PRECISE_CPU_LOAD)))
- goto do_avg;
-
- /* Update delta_fair/delta_exec fields first */
- update_curr_load(this_rq);
-
- fair_delta64 = ls->delta_fair + 1;
- ls->delta_fair = 0;
-
- exec_delta64 = ls->delta_exec + 1;
- ls->delta_exec = 0;
-
- sample_interval64 = this_rq->clock - ls->load_update_last;
- ls->load_update_last = this_rq->clock;
-
- if ((s64)sample_interval64 < (s64)TICK_NSEC)
- sample_interval64 = TICK_NSEC;
-
- if (exec_delta64 > sample_interval64)
- exec_delta64 = sample_interval64;
-
- idle_delta64 = sample_interval64 - exec_delta64;
-
- tmp64 = div64_64(SCHED_LOAD_SCALE * exec_delta64, fair_delta64);
- tmp64 = div64_64(tmp64 * exec_delta64, sample_interval64);
-
- this_load = (unsigned long)tmp64;
-
-do_avg:
/* Update our load: */
for (i = 0, scale = 1; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
@@ -2027,7 +2016,13 @@ do_avg:
old_load = this_rq->cpu_load[i];
new_load = this_load;
-
+ /*
+ * Round up the averaging division if load is increasing. This
+ * prevents us from getting stuck on 9 if the load is 10, for
+ * example.
+ */
+ if (new_load > old_load)
+ new_load += scale-1;
this_rq->cpu_load[i] = (old_load*(scale-1) + new_load) >> i;
}
}
@@ -2179,13 +2174,38 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
* 2) cannot be migrated to this CPU due to cpus_allowed, or
* 3) are cache-hot on their current CPU.
*/
- if (!cpu_isset(this_cpu, p->cpus_allowed))
+ if (!cpu_isset(this_cpu, p->cpus_allowed)) {
+ schedstat_inc(p, se.nr_failed_migrations_affine);
return 0;
+ }
*all_pinned = 0;
- if (task_running(rq, p))
+ if (task_running(rq, p)) {
+ schedstat_inc(p, se.nr_failed_migrations_running);
return 0;
+ }
+
+ /*
+ * Aggressive migration if:
+ * 1) task is cache cold, or
+ * 2) too many balance attempts have failed.
+ */
+
+ if (!task_hot(p, rq->clock, sd) ||
+ sd->nr_balance_failed > sd->cache_nice_tries) {
+#ifdef CONFIG_SCHEDSTATS
+ if (task_hot(p, rq->clock, sd)) {
+ schedstat_inc(sd, lb_hot_gained[idle]);
+ schedstat_inc(p, se.nr_forced_migrations);
+ }
+#endif
+ return 1;
+ }
+ if (task_hot(p, rq->clock, sd)) {
+ schedstat_inc(p, se.nr_failed_migrations_hot);
+ return 0;
+ }
return 1;
}
@@ -2264,7 +2284,7 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
struct sched_domain *sd, enum cpu_idle_type idle,
int *all_pinned)
{
- struct sched_class *class = sched_class_highest;
+ const struct sched_class *class = sched_class_highest;
unsigned long total_load_moved = 0;
int this_best_prio = this_rq->curr->prio;
@@ -2289,7 +2309,7 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
static int move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
struct sched_domain *sd, enum cpu_idle_type idle)
{
- struct sched_class *class;
+ const struct sched_class *class;
int this_best_prio = MAX_PRIO;
for (class = sched_class_highest; class; class = class->next)
@@ -2653,7 +2673,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
!test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
sd_idle = 1;
- schedstat_inc(sd, lb_cnt[idle]);
+ schedstat_inc(sd, lb_count[idle]);
redo:
group = find_busiest_group(sd, this_cpu, &imbalance, idle, &sd_idle,
@@ -2806,7 +2826,7 @@ load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd)
!test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
sd_idle = 1;
- schedstat_inc(sd, lb_cnt[CPU_NEWLY_IDLE]);
+ schedstat_inc(sd, lb_count[CPU_NEWLY_IDLE]);
redo:
group = find_busiest_group(sd, this_cpu, &imbalance, CPU_NEWLY_IDLE,
&sd_idle, &cpus, NULL);
@@ -2940,7 +2960,7 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
}
if (likely(sd)) {
- schedstat_inc(sd, alb_cnt);
+ schedstat_inc(sd, alb_count);
if (move_one_task(target_rq, target_cpu, busiest_rq,
sd, CPU_IDLE))
@@ -3033,7 +3053,7 @@ static DEFINE_SPINLOCK(balancing);
*
* Balancing parameters are set up in arch_init_sched_domains.
*/
-static inline void rebalance_domains(int cpu, enum cpu_idle_type idle)
+static void rebalance_domains(int cpu, enum cpu_idle_type idle)
{
int balance = 1;
struct rq *rq = cpu_rq(cpu);
@@ -3280,6 +3300,25 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
}
/*
+ * Account guest cpu time to a process.
+ * @p: the process that the cpu time gets accounted to
+ * @cputime: the cpu time spent in virtual machine since the last update
+ */
+void account_guest_time(struct task_struct *p, cputime_t cputime)
+{
+ cputime64_t tmp;
+ struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
+
+ tmp = cputime_to_cputime64(cputime);
+
+ p->utime = cputime_add(p->utime, cputime);
+ p->gtime = cputime_add(p->gtime, cputime);
+
+ cpustat->user = cputime64_add(cpustat->user, tmp);
+ cpustat->guest = cputime64_add(cpustat->guest, tmp);
+}
+
+/*
* Account system cpu time to a process.
* @p: the process that the cpu time gets accounted to
* @hardirq_offset: the offset to subtract from hardirq_count()
@@ -3292,6 +3331,12 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
struct rq *rq = this_rq();
cputime64_t tmp;
+ if (p->flags & PF_VCPU) {
+ account_guest_time(p, cputime);
+ p->flags &= ~PF_VCPU;
+ return;
+ }
+
p->stime = cputime_add(p->stime, cputime);
/* Add system time to cpustat. */
@@ -3430,7 +3475,13 @@ static inline void schedule_debug(struct task_struct *prev)
profile_hit(SCHED_PROFILING, __builtin_return_address(0));
- schedstat_inc(this_rq(), sched_cnt);
+ schedstat_inc(this_rq(), sched_count);
+#ifdef CONFIG_SCHEDSTATS
+ if (unlikely(prev->lock_depth >= 0)) {
+ schedstat_inc(this_rq(), bkl_count);
+ schedstat_inc(prev, sched_info.bkl_count);
+ }
+#endif
}
/*
@@ -3439,7 +3490,7 @@ static inline void schedule_debug(struct task_struct *prev)
static inline struct task_struct *
pick_next_task(struct rq *rq, struct task_struct *prev)
{
- struct sched_class *class;
+ const struct sched_class *class;
struct task_struct *p;
/*
@@ -3488,9 +3539,13 @@ need_resched_nonpreemptible:
schedule_debug(prev);
- spin_lock_irq(&rq->lock);
- clear_tsk_need_resched(prev);
+ /*
+ * Do the rq-clock update outside the rq lock:
+ */
+ local_irq_disable();
__update_rq_clock(rq);
+ spin_lock(&rq->lock);
+ clear_tsk_need_resched(prev);
if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
if (unlikely((prev->state & TASK_INTERRUPTIBLE) &&
@@ -3550,27 +3605,30 @@ asmlinkage void __sched preempt_schedule(void)
if (likely(ti->preempt_count || irqs_disabled()))
return;
-need_resched:
- add_preempt_count(PREEMPT_ACTIVE);
- /*
- * We keep the big kernel semaphore locked, but we
- * clear ->lock_depth so that schedule() doesnt
- * auto-release the semaphore:
- */
+ do {
+ add_preempt_count(PREEMPT_ACTIVE);
+
+ /*
+ * We keep the big kernel semaphore locked, but we
+ * clear ->lock_depth so that schedule() doesnt
+ * auto-release the semaphore:
+ */
#ifdef CONFIG_PREEMPT_BKL
- saved_lock_depth = task->lock_depth;
- task->lock_depth = -1;
+ saved_lock_depth = task->lock_depth;
+ task->lock_depth = -1;
#endif
- schedule();
+ schedule();
#ifdef CONFIG_PREEMPT_BKL
- task->lock_depth = saved_lock_depth;
+ task->lock_depth = saved_lock_depth;
#endif
- sub_preempt_count(PREEMPT_ACTIVE);
+ sub_preempt_count(PREEMPT_ACTIVE);
- /* we could miss a preemption opportunity between schedule and now */
- barrier();
- if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
- goto need_resched;
+ /*
+ * Check again in case we missed a preemption opportunity
+ * between schedule and now.
+ */
+ barrier();
+ } while (unlikely(test_thread_flag(TIF_NEED_RESCHED)));
}
EXPORT_SYMBOL(preempt_schedule);
@@ -3590,29 +3648,32 @@ asmlinkage void __sched preempt_schedule_irq(void)
/* Catch callers which need to be fixed */
BUG_ON(ti->preempt_count || !irqs_disabled());
-need_resched:
- add_preempt_count(PREEMPT_ACTIVE);
- /*
- * We keep the big kernel semaphore locked, but we
- * clear ->lock_depth so that schedule() doesnt
- * auto-release the semaphore:
- */
+ do {
+ add_preempt_count(PREEMPT_ACTIVE);
+
+ /*
+ * We keep the big kernel semaphore locked, but we
+ * clear ->lock_depth so that schedule() doesnt
+ * auto-release the semaphore:
+ */
#ifdef CONFIG_PREEMPT_BKL
- saved_lock_depth = task->lock_depth;
- task->lock_depth = -1;
+ saved_lock_depth = task->lock_depth;
+ task->lock_depth = -1;
#endif
- local_irq_enable();
- schedule();
- local_irq_disable();
+ local_irq_enable();
+ schedule();
+ local_irq_disable();
#ifdef CONFIG_PREEMPT_BKL
- task->lock_depth = saved_lock_depth;
+ task->lock_depth = saved_lock_depth;
#endif
- sub_preempt_count(PREEMPT_ACTIVE);
+ sub_preempt_count(PREEMPT_ACTIVE);
- /* we could miss a preemption opportunity between schedule and now */
- barrier();
- if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
- goto need_resched;
+ /*
+ * Check again in case we missed a preemption opportunity
+ * between schedule and now.
+ */
+ barrier();
+ } while (unlikely(test_thread_flag(TIF_NEED_RESCHED)));
}
#endif /* CONFIG_PREEMPT */
@@ -3636,10 +3697,9 @@ EXPORT_SYMBOL(default_wake_function);
static void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
int nr_exclusive, int sync, void *key)
{
- struct list_head *tmp, *next;
+ wait_queue_t *curr, *next;
- list_for_each_safe(tmp, next, &q->task_list) {
- wait_queue_t *curr = list_entry(tmp, wait_queue_t, task_list);
+ list_for_each_entry_safe(curr, next, &q->task_list, task_list) {
unsigned flags = curr->flags;
if (curr->func(curr, mode, sync, key) &&
@@ -3729,206 +3789,116 @@ void fastcall complete_all(struct completion *x)
}
EXPORT_SYMBOL(complete_all);
-void fastcall __sched wait_for_completion(struct completion *x)
+static inline long __sched
+do_wait_for_common(struct completion *x, long timeout, int state)
{
- might_sleep();
-
- spin_lock_irq(&x->wait.lock);
if (!x->done) {
DECLARE_WAITQUEUE(wait, current);
wait.flags |= WQ_FLAG_EXCLUSIVE;
__add_wait_queue_tail(&x->wait, &wait);
do {
- __set_current_state(TASK_UNINTERRUPTIBLE);
- spin_unlock_irq(&x->wait.lock);
- schedule();
- spin_lock_irq(&x->wait.lock);
- } while (!x->done);
- __remove_wait_queue(&x->wait, &wait);
- }
- x->done--;
- spin_unlock_irq(&x->wait.lock);
-}
-EXPORT_SYMBOL(wait_for_completion);
-
-unsigned long fastcall __sched
-wait_for_completion_timeout(struct completion *x, unsigned long timeout)
-{
- might_sleep();
-
- spin_lock_irq(&x->wait.lock);
- if (!x->done) {
- DECLARE_WAITQUEUE(wait, current);
-
- wait.flags |= WQ_FLAG_EXCLUSIVE;
- __add_wait_queue_tail(&x->wait, &wait);
- do {
- __set_current_state(TASK_UNINTERRUPTIBLE);
+ if (state == TASK_INTERRUPTIBLE &&
+ signal_pending(current)) {
+ __remove_wait_queue(&x->wait, &wait);
+ return -ERESTARTSYS;
+ }
+ __set_current_state(state);
spin_unlock_irq(&x->wait.lock);
timeout = schedule_timeout(timeout);
spin_lock_irq(&x->wait.lock);
if (!timeout) {
__remove_wait_queue(&x->wait, &wait);
- goto out;
+ return timeout;
}
} while (!x->done);
__remove_wait_queue(&x->wait, &wait);
}
x->done--;
-out:
- spin_unlock_irq(&x->wait.lock);
return timeout;
}
-EXPORT_SYMBOL(wait_for_completion_timeout);
-int fastcall __sched wait_for_completion_interruptible(struct completion *x)
+static long __sched
+wait_for_common(struct completion *x, long timeout, int state)
{
- int ret = 0;
-
might_sleep();
spin_lock_irq(&x->wait.lock);
- if (!x->done) {
- DECLARE_WAITQUEUE(wait, current);
-
- wait.flags |= WQ_FLAG_EXCLUSIVE;
- __add_wait_queue_tail(&x->wait, &wait);
- do {
- if (signal_pending(current)) {
- ret = -ERESTARTSYS;
- __remove_wait_queue(&x->wait, &wait);
- goto out;
- }
- __set_current_state(TASK_INTERRUPTIBLE);
- spin_unlock_irq(&x->wait.lock);
- schedule();
- spin_lock_irq(&x->wait.lock);
- } while (!x->done);
- __remove_wait_queue(&x->wait, &wait);
- }
- x->done--;
-out:
+ timeout = do_wait_for_common(x, timeout, state);
spin_unlock_irq(&x->wait.lock);
+ return timeout;
+}
- return ret;
+void fastcall __sched wait_for_completion(struct completion *x)
+{
+ wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE);
}
-EXPORT_SYMBOL(wait_for_completion_interruptible);
+EXPORT_SYMBOL(wait_for_completion);
unsigned long fastcall __sched
-wait_for_completion_interruptible_timeout(struct completion *x,
- unsigned long timeout)
+wait_for_completion_timeout(struct completion *x, unsigned long timeout)
{
- might_sleep();
-
- spin_lock_irq(&x->wait.lock);
- if (!x->done) {
- DECLARE_WAITQUEUE(wait, current);
-
- wait.flags |= WQ_FLAG_EXCLUSIVE;
- __add_wait_queue_tail(&x->wait, &wait);
- do {
- if (signal_pending(current)) {
- timeout = -ERESTARTSYS;
- __remove_wait_queue(&x->wait, &wait);
- goto out;
- }
- __set_current_state(TASK_INTERRUPTIBLE);
- spin_unlock_irq(&x->wait.lock);
- timeout = schedule_timeout(timeout);
- spin_lock_irq(&x->wait.lock);
- if (!timeout) {
- __remove_wait_queue(&x->wait, &wait);
- goto out;
- }
- } while (!x->done);
- __remove_wait_queue(&x->wait, &wait);
- }
- x->done--;
-out:
- spin_unlock_irq(&x->wait.lock);
- return timeout;
+ return wait_for_common(x, timeout, TASK_UNINTERRUPTIBLE);
}
-EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
+EXPORT_SYMBOL(wait_for_completion_timeout);
-static inline void
-sleep_on_head(wait_queue_head_t *q, wait_queue_t *wait, unsigned long *flags)
+int __sched wait_for_completion_interruptible(struct completion *x)
{
- spin_lock_irqsave(&q->lock, *flags);
- __add_wait_queue(q, wait);
- spin_unlock(&q->lock);
+ return wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_INTERRUPTIBLE);
}
+EXPORT_SYMBOL(wait_for_completion_interruptible);
-static inline void
-sleep_on_tail(wait_queue_head_t *q, wait_queue_t *wait, unsigned long *flags)
+unsigned long fastcall __sched
+wait_for_completion_interruptible_timeout(struct completion *x,
+ unsigned long timeout)
{
- spin_lock_irq(&q->lock);
- __remove_wait_queue(q, wait);
- spin_unlock_irqrestore(&q->lock, *flags);
+ return wait_for_common(x, timeout, TASK_INTERRUPTIBLE);
}
+EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
-void __sched interruptible_sleep_on(wait_queue_head_t *q)
+static long __sched
+sleep_on_common(wait_queue_head_t *q, int state, long timeout)
{
unsigned long flags;
wait_queue_t wait;
init_waitqueue_entry(&wait, current);
- current->state = TASK_INTERRUPTIBLE;
+ __set_current_state(state);
- sleep_on_head(q, &wait, &flags);
- schedule();
- sleep_on_tail(q, &wait, &flags);
+ spin_lock_irqsave(&q->lock, flags);
+ __add_wait_queue(q, &wait);
+ spin_unlock(&q->lock);
+ timeout = schedule_timeout(timeout);
+ spin_lock_irq(&q->lock);
+ __remove_wait_queue(q, &wait);
+ spin_unlock_irqrestore(&q->lock, flags);
+
+ return timeout;
+}
+
+void __sched interruptible_sleep_on(wait_queue_head_t *q)
+{
+ sleep_on_common(q, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
}
EXPORT_SYMBOL(interruptible_sleep_on);
long __sched
interruptible_sleep_on_timeout(wait_queue_head_t *q, long timeout)
{
- unsigned long flags;
- wait_queue_t wait;
-
- init_waitqueue_entry(&wait, current);
-
- current->state = TASK_INTERRUPTIBLE;
-
- sleep_on_head(q, &wait, &flags);
- timeout = schedule_timeout(timeout);
- sleep_on_tail(q, &wait, &flags);
-
- return timeout;
+ return sleep_on_common(q, TASK_INTERRUPTIBLE, timeout);
}
EXPORT_SYMBOL(interruptible_sleep_on_timeout);
void __sched sleep_on(wait_queue_head_t *q)
{
- unsigned long flags;
- wait_queue_t wait;
-
- init_waitqueue_entry(&wait, current);
-
- current->state = TASK_UNINTERRUPTIBLE;
-
- sleep_on_head(q, &wait, &flags);
- schedule();
- sleep_on_tail(q, &wait, &flags);
+ sleep_on_common(q, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
}
EXPORT_SYMBOL(sleep_on);
long __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
{
- unsigned long flags;
- wait_queue_t wait;
-
- init_waitqueue_entry(&wait, current);
-
- current->state = TASK_UNINTERRUPTIBLE;
-
- sleep_on_head(q, &wait, &flags);
- timeout = schedule_timeout(timeout);
- sleep_on_tail(q, &wait, &flags);
-
- return timeout;
+ return sleep_on_common(q, TASK_UNINTERRUPTIBLE, timeout);
}
EXPORT_SYMBOL(sleep_on_timeout);
@@ -3947,7 +3917,7 @@ EXPORT_SYMBOL(sleep_on_timeout);
void rt_mutex_setprio(struct task_struct *p, int prio)
{
unsigned long flags;
- int oldprio, on_rq;
+ int oldprio, on_rq, running;
struct rq *rq;
BUG_ON(prio < 0 || prio > MAX_PRIO);
@@ -3957,8 +3927,12 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
oldprio = p->prio;
on_rq = p->se.on_rq;
- if (on_rq)
+ running = task_running(rq, p);
+ if (on_rq) {
dequeue_task(rq, p, 0);
+ if (running)
+ p->sched_class->put_prev_task(rq, p);
+ }
if (rt_prio(prio))
p->sched_class = &rt_sched_class;
@@ -3968,13 +3942,15 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
p->prio = prio;
if (on_rq) {
+ if (running)
+ p->sched_class->set_curr_task(rq);
enqueue_task(rq, p, 0);
/*
* Reschedule if we are currently running on this runqueue and
* our priority decreased, or if we are not currently running on
* this runqueue and our priority is higher than the current's
*/
- if (task_running(rq, p)) {
+ if (running) {
if (p->prio > oldprio)
resched_task(rq->curr);
} else {
@@ -4138,7 +4114,7 @@ struct task_struct *idle_task(int cpu)
* find_process_by_pid - find a process with a matching PID value.
* @pid: the pid in question.
*/
-static inline struct task_struct *find_process_by_pid(pid_t pid)
+static struct task_struct *find_process_by_pid(pid_t pid)
{
return pid ? find_task_by_pid(pid) : current;
}
@@ -4180,7 +4156,7 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
int sched_setscheduler(struct task_struct *p, int policy,
struct sched_param *param)
{
- int retval, oldprio, oldpolicy = -1, on_rq;
+ int retval, oldprio, oldpolicy = -1, on_rq, running;
unsigned long flags;
struct rq *rq;
@@ -4262,18 +4238,26 @@ recheck:
}
update_rq_clock(rq);
on_rq = p->se.on_rq;
- if (on_rq)
+ running = task_running(rq, p);
+ if (on_rq) {
deactivate_task(rq, p, 0);
+ if (running)
+ p->sched_class->put_prev_task(rq, p);
+ }
+
oldprio = p->prio;
__setscheduler(rq, p, policy, param->sched_priority);
+
if (on_rq) {
+ if (running)
+ p->sched_class->set_curr_task(rq);
activate_task(rq, p, 0);
/*
* Reschedule if we are currently running on this runqueue and
* our priority decreased, or if we are not currently running on
* this runqueue and our priority is higher than the current's
*/
- if (task_running(rq, p)) {
+ if (running) {
if (p->prio > oldprio)
resched_task(rq->curr);
} else {
@@ -4344,10 +4328,10 @@ asmlinkage long sys_sched_setparam(pid_t pid, struct sched_param __user *param)
asmlinkage long sys_sched_getscheduler(pid_t pid)
{
struct task_struct *p;
- int retval = -EINVAL;
+ int retval;
if (pid < 0)
- goto out_nounlock;
+ return -EINVAL;
retval = -ESRCH;
read_lock(&tasklist_lock);
@@ -4358,8 +4342,6 @@ asmlinkage long sys_sched_getscheduler(pid_t pid)
retval = p->policy;
}
read_unlock(&tasklist_lock);
-
-out_nounlock:
return retval;
}
@@ -4372,10 +4354,10 @@ asmlinkage long sys_sched_getparam(pid_t pid, struct sched_param __user *param)
{
struct sched_param lp;
struct task_struct *p;
- int retval = -EINVAL;
+ int retval;
if (!param || pid < 0)
- goto out_nounlock;
+ return -EINVAL;
read_lock(&tasklist_lock);
p = find_process_by_pid(pid);
@@ -4395,7 +4377,6 @@ asmlinkage long sys_sched_getparam(pid_t pid, struct sched_param __user *param)
*/
retval = copy_to_user(param, &lp, sizeof(*param)) ? -EFAULT : 0;
-out_nounlock:
return retval;
out_unlock:
@@ -4555,8 +4536,8 @@ asmlinkage long sys_sched_yield(void)
{
struct rq *rq = this_rq_lock();
- schedstat_inc(rq, yld_cnt);
- current->sched_class->yield_task(rq, current);
+ schedstat_inc(rq, yld_count);
+ current->sched_class->yield_task(rq);
/*
* Since we are going to call schedule() anyway, there's
@@ -4750,11 +4731,12 @@ asmlinkage
long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
{
struct task_struct *p;
- int retval = -EINVAL;
+ unsigned int time_slice;
+ int retval;
struct timespec t;
if (pid < 0)
- goto out_nounlock;
+ return -EINVAL;
retval = -ESRCH;
read_lock(&tasklist_lock);
@@ -4766,12 +4748,24 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
if (retval)
goto out_unlock;
- jiffies_to_timespec(p->policy == SCHED_FIFO ?
- 0 : static_prio_timeslice(p->static_prio), &t);
+ if (p->policy == SCHED_FIFO)
+ time_slice = 0;
+ else if (p->policy == SCHED_RR)
+ time_slice = DEF_TIMESLICE;
+ else {
+ struct sched_entity *se = &p->se;
+ unsigned long flags;
+ struct rq *rq;
+
+ rq = task_rq_lock(p, &flags);
+ time_slice = NS_TO_JIFFIES(sched_slice(cfs_rq_of(se), se));
+ task_rq_unlock(rq, &flags);
+ }
read_unlock(&tasklist_lock);
+ jiffies_to_timespec(time_slice, &t);
retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;
-out_nounlock:
return retval;
+
out_unlock:
read_unlock(&tasklist_lock);
return retval;
@@ -4900,32 +4894,6 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
*/
cpumask_t nohz_cpu_mask = CPU_MASK_NONE;
-/*
- * Increase the granularity value when there are more CPUs,
- * because with more CPUs the 'effective latency' as visible
- * to users decreases. But the relationship is not linear,
- * so pick a second-best guess by going with the log2 of the
- * number of CPUs.
- *
- * This idea comes from the SD scheduler of Con Kolivas:
- */
-static inline void sched_init_granularity(void)
-{
- unsigned int factor = 1 + ilog2(num_online_cpus());
- const unsigned long limit = 100000000;
-
- sysctl_sched_min_granularity *= factor;
- if (sysctl_sched_min_granularity > limit)
- sysctl_sched_min_granularity = limit;
-
- sysctl_sched_latency *= factor;
- if (sysctl_sched_latency > limit)
- sysctl_sched_latency = limit;
-
- sysctl_sched_runtime_limit = sysctl_sched_latency;
- sysctl_sched_wakeup_granularity = sysctl_sched_min_granularity / 2;
-}
-
#ifdef CONFIG_SMP
/*
* This is how migration works:
@@ -5103,35 +5071,34 @@ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
struct rq *rq;
int dest_cpu;
-restart:
- /* On same node? */
- mask = node_to_cpumask(cpu_to_node(dead_cpu));
- cpus_and(mask, mask, p->cpus_allowed);
- dest_cpu = any_online_cpu(mask);
-
- /* On any allowed CPU? */
- if (dest_cpu == NR_CPUS)
- dest_cpu = any_online_cpu(p->cpus_allowed);
-
- /* No more Mr. Nice Guy. */
- if (dest_cpu == NR_CPUS) {
- rq = task_rq_lock(p, &flags);
- cpus_setall(p->cpus_allowed);
- dest_cpu = any_online_cpu(p->cpus_allowed);
- task_rq_unlock(rq, &flags);
+ do {
+ /* On same node? */
+ mask = node_to_cpumask(cpu_to_node(dead_cpu));
+ cpus_and(mask, mask, p->cpus_allowed);
+ dest_cpu = any_online_cpu(mask);
+
+ /* On any allowed CPU? */
+ if (dest_cpu == NR_CPUS)
+ dest_cpu = any_online_cpu(p->cpus_allowed);
+
+ /* No more Mr. Nice Guy. */
+ if (dest_cpu == NR_CPUS) {
+ rq = task_rq_lock(p, &flags);
+ cpus_setall(p->cpus_allowed);
+ dest_cpu = any_online_cpu(p->cpus_allowed);
+ task_rq_unlock(rq, &flags);
- /*
- * Don't tell them about moving exiting tasks or
- * kernel threads (both mm NULL), since they never
- * leave kernel.
- */
- if (p->mm && printk_ratelimit())
- printk(KERN_INFO "process %d (%s) no "
- "longer affine to cpu%d\n",
- p->pid, p->comm, dead_cpu);
- }
- if (!__migrate_task(p, dead_cpu, dest_cpu))
- goto restart;
+ /*
+ * Don't tell them about moving exiting tasks or
+ * kernel threads (both mm NULL), since they never
+ * leave kernel.
+ */
+ if (p->mm && printk_ratelimit())
+ printk(KERN_INFO "process %d (%s) no "
+ "longer affine to cpu%d\n",
+ p->pid, p->comm, dead_cpu);
+ }
+ } while (!__migrate_task(p, dead_cpu, dest_cpu));
}
/*
@@ -5173,6 +5140,20 @@ static void migrate_live_tasks(int src_cpu)
}
/*
+ * activate_idle_task - move idle task to the _front_ of runqueue.
+ */
+static void activate_idle_task(struct task_struct *p, struct rq *rq)
+{
+ update_rq_clock(rq);
+
+ if (p->state == TASK_UNINTERRUPTIBLE)
+ rq->nr_uninterruptible--;
+
+ enqueue_task(rq, p, 0);
+ inc_nr_running(p, rq);
+}
+
+/*
* Schedules idle task to be the next runnable task on current CPU.
* It does so by boosting its priority to highest possible and adding it to
* the _front_ of the runqueue. Used by CPU offline code.
@@ -5284,14 +5265,23 @@ static struct ctl_table sd_ctl_root[] = {
static struct ctl_table *sd_alloc_ctl_entry(int n)
{
struct ctl_table *entry =
- kmalloc(n * sizeof(struct ctl_table), GFP_KERNEL);
-
- BUG_ON(!entry);
- memset(entry, 0, n * sizeof(struct ctl_table));
+ kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL);
return entry;
}
+static void sd_free_ctl_entry(struct ctl_table **tablep)
+{
+ struct ctl_table *entry = *tablep;
+
+ for (entry = *tablep; entry->procname; entry++)
+ if (entry->child)
+ sd_free_ctl_entry(&entry->child);
+
+ kfree(*tablep);
+ *tablep = NULL;
+}
+
static void
set_table_entry(struct ctl_table *entry,
const char *procname, void *data, int maxlen,
@@ -5307,7 +5297,10 @@ set_table_entry(struct ctl_table *entry,
static struct ctl_table *
sd_alloc_ctl_domain_table(struct sched_domain *sd)
{
- struct ctl_table *table = sd_alloc_ctl_entry(14);
+ struct ctl_table *table = sd_alloc_ctl_entry(12);
+
+ if (table == NULL)
+ return NULL;
set_table_entry(&table[0], "min_interval", &sd->min_interval,
sizeof(long), 0644, proc_doulongvec_minmax);
@@ -5327,11 +5320,12 @@ sd_alloc_ctl_domain_table(struct sched_domain *sd)
sizeof(int), 0644, proc_dointvec_minmax);
set_table_entry(&table[8], "imbalance_pct", &sd->imbalance_pct,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[10], "cache_nice_tries",
+ set_table_entry(&table[9], "cache_nice_tries",
&sd->cache_nice_tries,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[12], "flags", &sd->flags,
+ set_table_entry(&table[10], "flags", &sd->flags,
sizeof(int), 0644, proc_dointvec_minmax);
+ /* &table[11] is terminator */
return table;
}
@@ -5346,6 +5340,8 @@ static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
for_each_domain(cpu, sd)
domain_num++;
entry = table = sd_alloc_ctl_entry(domain_num + 1);
+ if (table == NULL)
+ return NULL;
i = 0;
for_each_domain(cpu, sd) {
@@ -5360,24 +5356,38 @@ static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
}
static struct ctl_table_header *sd_sysctl_header;
-static void init_sched_domain_sysctl(void)
+static void register_sched_domain_sysctl(void)
{
int i, cpu_num = num_online_cpus();
struct ctl_table *entry = sd_alloc_ctl_entry(cpu_num + 1);
char buf[32];
+ if (entry == NULL)
+ return;
+
sd_ctl_dir[0].child = entry;
- for (i = 0; i < cpu_num; i++, entry++) {
+ for_each_online_cpu(i) {
snprintf(buf, 32, "cpu%d", i);
entry->procname = kstrdup(buf, GFP_KERNEL);
entry->mode = 0555;
entry->child = sd_alloc_ctl_cpu_table(i);
+ entry++;
}
sd_sysctl_header = register_sysctl_table(sd_ctl_root);
}
+
+static void unregister_sched_domain_sysctl(void)
+{
+ unregister_sysctl_table(sd_sysctl_header);
+ sd_sysctl_header = NULL;
+ sd_free_ctl_entry(&sd_ctl_dir[0].child);
+}
#else
-static void init_sched_domain_sysctl(void)
+static void register_sched_domain_sysctl(void)
+{
+}
+static void unregister_sched_domain_sysctl(void)
{
}
#endif
@@ -5499,8 +5509,7 @@ int __init migration_init(void)
int nr_cpu_ids __read_mostly = NR_CPUS;
EXPORT_SYMBOL(nr_cpu_ids);
-#undef SCHED_DOMAIN_DEBUG
-#ifdef SCHED_DOMAIN_DEBUG
+#ifdef CONFIG_SCHED_DEBUG
static void sched_domain_debug(struct sched_domain *sd, int cpu)
{
int level = 0;
@@ -5558,16 +5567,19 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu)
printk("\n");
printk(KERN_ERR "ERROR: domain->cpu_power not "
"set\n");
+ break;
}
if (!cpus_weight(group->cpumask)) {
printk("\n");
printk(KERN_ERR "ERROR: empty group\n");
+ break;
}
if (cpus_intersects(groupmask, group->cpumask)) {
printk("\n");
printk(KERN_ERR "ERROR: repeated CPUs\n");
+ break;
}
cpus_or(groupmask, groupmask, group->cpumask);
@@ -5701,7 +5713,7 @@ static int __init isolated_cpu_setup(char *str)
return 1;
}
-__setup ("isolcpus=", isolated_cpu_setup);
+__setup("isolcpus=", isolated_cpu_setup);
/*
* init_sched_build_groups takes the cpumask we wish to span, and a pointer
@@ -5857,7 +5869,7 @@ static int cpu_to_core_group(int cpu, const cpumask_t *cpu_map,
struct sched_group **sg)
{
int group;
- cpumask_t mask = cpu_sibling_map[cpu];
+ cpumask_t mask = per_cpu(cpu_sibling_map, cpu);
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
if (sg)
@@ -5886,7 +5898,7 @@ static int cpu_to_phys_group(int cpu, const cpumask_t *cpu_map,
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
#elif defined(CONFIG_SCHED_SMT)
- cpumask_t mask = cpu_sibling_map[cpu];
+ cpumask_t mask = per_cpu(cpu_sibling_map, cpu);
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
#else
@@ -5930,24 +5942,23 @@ static void init_numa_sched_groups_power(struct sched_group *group_head)
if (!sg)
return;
-next_sg:
- for_each_cpu_mask(j, sg->cpumask) {
- struct sched_domain *sd;
+ do {
+ for_each_cpu_mask(j, sg->cpumask) {
+ struct sched_domain *sd;
- sd = &per_cpu(phys_domains, j);
- if (j != first_cpu(sd->groups->cpumask)) {
- /*
- * Only add "power" once for each
- * physical package.
- */
- continue;
- }
+ sd = &per_cpu(phys_domains, j);
+ if (j != first_cpu(sd->groups->cpumask)) {
+ /*
+ * Only add "power" once for each
+ * physical package.
+ */
+ continue;
+ }
- sg_inc_cpu_power(sg, sd->groups->__cpu_power);
- }
- sg = sg->next;
- if (sg != group_head)
- goto next_sg;
+ sg_inc_cpu_power(sg, sd->groups->__cpu_power);
+ }
+ sg = sg->next;
+ } while (sg != group_head);
}
#endif
@@ -6058,7 +6069,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
/*
* Allocate the per-node list of sched groups
*/
- sched_group_nodes = kzalloc(sizeof(struct sched_group *)*MAX_NUMNODES,
+ sched_group_nodes = kcalloc(MAX_NUMNODES, sizeof(struct sched_group *),
GFP_KERNEL);
if (!sched_group_nodes) {
printk(KERN_WARNING "Can not alloc sched group node list\n");
@@ -6121,7 +6132,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
p = sd;
sd = &per_cpu(cpu_domains, i);
*sd = SD_SIBLING_INIT;
- sd->span = cpu_sibling_map[i];
+ sd->span = per_cpu(cpu_sibling_map, i);
cpus_and(sd->span, sd->span, *cpu_map);
sd->parent = p;
p->child = sd;
@@ -6132,7 +6143,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
#ifdef CONFIG_SCHED_SMT
/* Set up CPU (sibling) groups */
for_each_cpu_mask(i, *cpu_map) {
- cpumask_t this_sibling_map = cpu_sibling_map[i];
+ cpumask_t this_sibling_map = per_cpu(cpu_sibling_map, i);
cpus_and(this_sibling_map, this_sibling_map, *cpu_map);
if (i != first_cpu(this_sibling_map))
continue;
@@ -6311,6 +6322,8 @@ static int arch_init_sched_domains(const cpumask_t *cpu_map)
err = build_sched_domains(&cpu_default_map);
+ register_sched_domain_sysctl();
+
return err;
}
@@ -6327,39 +6340,14 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
{
int i;
+ unregister_sched_domain_sysctl();
+
for_each_cpu_mask(i, *cpu_map)
cpu_attach_domain(NULL, i);
synchronize_sched();
arch_destroy_sched_domains(cpu_map);
}
-/*
- * Partition sched domains as specified by the cpumasks below.
- * This attaches all cpus from the cpumasks to the NULL domain,
- * waits for a RCU quiescent period, recalculates sched
- * domain information and then attaches them back to the
- * correct sched domains
- * Call with hotplug lock held
- */
-int partition_sched_domains(cpumask_t *partition1, cpumask_t *partition2)
-{
- cpumask_t change_map;
- int err = 0;
-
- cpus_and(*partition1, *partition1, cpu_online_map);
- cpus_and(*partition2, *partition2, cpu_online_map);
- cpus_or(change_map, *partition1, *partition2);
-
- /* Detach sched domains from all of the affected cpus */
- detach_destroy_domains(&change_map);
- if (!cpus_empty(*partition1))
- err = build_sched_domains(partition1);
- if (!err && !cpus_empty(*partition2))
- err = build_sched_domains(partition2);
-
- return err;
-}
-
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
static int arch_reinit_sched_domains(void)
{
@@ -6488,17 +6476,13 @@ void __init sched_init_smp(void)
/* XXX: Theoretical race here - CPU may be hotplugged now */
hotcpu_notifier(update_sched_domains, 0);
- init_sched_domain_sysctl();
-
/* Move init over to a non-isolated CPU */
if (set_cpus_allowed(current, non_isolated_cpus) < 0)
BUG();
- sched_init_granularity();
}
#else
void __init sched_init_smp(void)
{
- sched_init_granularity();
}
#endif /* CONFIG_SMP */
@@ -6512,28 +6496,20 @@ int in_sched_functions(unsigned long addr)
&& addr < (unsigned long)__sched_text_end);
}
-static inline void init_cfs_rq(struct cfs_rq *cfs_rq, struct rq *rq)
+static void init_cfs_rq(struct cfs_rq *cfs_rq, struct rq *rq)
{
cfs_rq->tasks_timeline = RB_ROOT;
- cfs_rq->fair_clock = 1;
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq->rq = rq;
#endif
+ cfs_rq->min_vruntime = (u64)(-(1LL << 20));
}
void __init sched_init(void)
{
- u64 now = sched_clock();
int highest_cpu = 0;
int i, j;
- /*
- * Link up the scheduling class hierarchy:
- */
- rt_sched_class.next = &fair_sched_class;
- fair_sched_class.next = &idle_sched_class;
- idle_sched_class.next = NULL;
-
for_each_possible_cpu(i) {
struct rt_prio_array *array;
struct rq *rq;
@@ -6546,10 +6522,28 @@ void __init sched_init(void)
init_cfs_rq(&rq->cfs, rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
- list_add(&rq->cfs.leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
+ {
+ struct cfs_rq *cfs_rq = &per_cpu(init_cfs_rq, i);
+ struct sched_entity *se =
+ &per_cpu(init_sched_entity, i);
+
+ init_cfs_rq_p[i] = cfs_rq;
+ init_cfs_rq(cfs_rq, rq);
+ cfs_rq->tg = &init_task_group;
+ list_add(&cfs_rq->leaf_cfs_rq_list,
+ &rq->leaf_cfs_rq_list);
+
+ init_sched_entity_p[i] = se;
+ se->cfs_rq = &rq->cfs;
+ se->my_q = cfs_rq;
+ se->load.weight = init_task_group_load;
+ se->load.inv_weight =
+ div64_64(1ULL<<32, init_task_group_load);
+ se->parent = NULL;
+ }
+ init_task_group.shares = init_task_group_load;
+ spin_lock_init(&init_task_group.lock);
#endif
- rq->ls.load_update_last = now;
- rq->ls.load_update_start = now;
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
rq->cpu_load[j] = 0;
@@ -6634,26 +6628,40 @@ EXPORT_SYMBOL(__might_sleep);
#endif
#ifdef CONFIG_MAGIC_SYSRQ
+static void normalize_task(struct rq *rq, struct task_struct *p)
+{
+ int on_rq;
+ update_rq_clock(rq);
+ on_rq = p->se.on_rq;
+ if (on_rq)
+ deactivate_task(rq, p, 0);
+ __setscheduler(rq, p, SCHED_NORMAL, 0);
+ if (on_rq) {
+ activate_task(rq, p, 0);
+ resched_task(rq->curr);
+ }
+}
+
void normalize_rt_tasks(void)
{
struct task_struct *g, *p;
unsigned long flags;
struct rq *rq;
- int on_rq;
read_lock_irq(&tasklist_lock);
do_each_thread(g, p) {
- p->se.fair_key = 0;
- p->se.wait_runtime = 0;
+ /*
+ * Only normalize user tasks:
+ */
+ if (!p->mm)
+ continue;
+
p->se.exec_start = 0;
- p->se.wait_start_fair = 0;
- p->se.sleep_start_fair = 0;
#ifdef CONFIG_SCHEDSTATS
p->se.wait_start = 0;
p->se.sleep_start = 0;
p->se.block_start = 0;
#endif
- task_rq(p)->cfs.fair_clock = 0;
task_rq(p)->clock = 0;
if (!rt_task(p)) {
@@ -6668,26 +6676,9 @@ void normalize_rt_tasks(void)
spin_lock_irqsave(&p->pi_lock, flags);
rq = __task_rq_lock(p);
-#ifdef CONFIG_SMP
- /*
- * Do not touch the migration thread:
- */
- if (p == rq->migration_thread)
- goto out_unlock;
-#endif
- update_rq_clock(rq);
- on_rq = p->se.on_rq;
- if (on_rq)
- deactivate_task(rq, p, 0);
- __setscheduler(rq, p, SCHED_NORMAL, 0);
- if (on_rq) {
- activate_task(rq, p, 0);
- resched_task(rq->curr);
- }
-#ifdef CONFIG_SMP
- out_unlock:
-#endif
+ normalize_task(rq, p);
+
__task_rq_unlock(rq);
spin_unlock_irqrestore(&p->pi_lock, flags);
} while_each_thread(g, p);
@@ -6740,3 +6731,201 @@ void set_curr_task(int cpu, struct task_struct *p)
}
#endif
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+
+/* allocate runqueue etc for a new task group */
+struct task_group *sched_create_group(void)
+{
+ struct task_group *tg;
+ struct cfs_rq *cfs_rq;
+ struct sched_entity *se;
+ struct rq *rq;
+ int i;
+
+ tg = kzalloc(sizeof(*tg), GFP_KERNEL);
+ if (!tg)
+ return ERR_PTR(-ENOMEM);
+
+ tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL);
+ if (!tg->cfs_rq)
+ goto err;
+ tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL);
+ if (!tg->se)
+ goto err;
+
+ for_each_possible_cpu(i) {
+ rq = cpu_rq(i);
+
+ cfs_rq = kmalloc_node(sizeof(struct cfs_rq), GFP_KERNEL,
+ cpu_to_node(i));
+ if (!cfs_rq)
+ goto err;
+
+ se = kmalloc_node(sizeof(struct sched_entity), GFP_KERNEL,
+ cpu_to_node(i));
+ if (!se)
+ goto err;
+
+ memset(cfs_rq, 0, sizeof(struct cfs_rq));
+ memset(se, 0, sizeof(struct sched_entity));
+
+ tg->cfs_rq[i] = cfs_rq;
+ init_cfs_rq(cfs_rq, rq);
+ cfs_rq->tg = tg;
+
+ tg->se[i] = se;
+ se->cfs_rq = &rq->cfs;
+ se->my_q = cfs_rq;
+ se->load.weight = NICE_0_LOAD;
+ se->load.inv_weight = div64_64(1ULL<<32, NICE_0_LOAD);
+ se->parent = NULL;
+ }
+
+ for_each_possible_cpu(i) {
+ rq = cpu_rq(i);
+ cfs_rq = tg->cfs_rq[i];
+ list_add_rcu(&cfs_rq->leaf_cfs_rq_list, &rq->leaf_cfs_rq_list);
+ }
+
+ tg->shares = NICE_0_LOAD;
+ spin_lock_init(&tg->lock);
+
+ return tg;
+
+err:
+ for_each_possible_cpu(i) {
+ if (tg->cfs_rq)
+ kfree(tg->cfs_rq[i]);
+ if (tg->se)
+ kfree(tg->se[i]);
+ }
+ kfree(tg->cfs_rq);
+ kfree(tg->se);
+ kfree(tg);
+
+ return ERR_PTR(-ENOMEM);
+}
+
+/* rcu callback to free various structures associated with a task group */
+static void free_sched_group(struct rcu_head *rhp)
+{
+ struct cfs_rq *cfs_rq = container_of(rhp, struct cfs_rq, rcu);
+ struct task_group *tg = cfs_rq->tg;
+ struct sched_entity *se;
+ int i;
+
+ /* now it should be safe to free those cfs_rqs */
+ for_each_possible_cpu(i) {
+ cfs_rq = tg->cfs_rq[i];
+ kfree(cfs_rq);
+
+ se = tg->se[i];
+ kfree(se);
+ }
+
+ kfree(tg->cfs_rq);
+ kfree(tg->se);
+ kfree(tg);
+}
+
+/* Destroy runqueue etc associated with a task group */
+void sched_destroy_group(struct task_group *tg)
+{
+ struct cfs_rq *cfs_rq;
+ int i;
+
+ for_each_possible_cpu(i) {
+ cfs_rq = tg->cfs_rq[i];
+ list_del_rcu(&cfs_rq->leaf_cfs_rq_list);
+ }
+
+ cfs_rq = tg->cfs_rq[0];
+
+ /* wait for possible concurrent references to cfs_rqs complete */
+ call_rcu(&cfs_rq->rcu, free_sched_group);
+}
+
+/* change task's runqueue when it moves between groups.
+ * The caller of this function should have put the task in its new group
+ * by now. This function just updates tsk->se.cfs_rq and tsk->se.parent to
+ * reflect its new group.
+ */
+void sched_move_task(struct task_struct *tsk)
+{
+ int on_rq, running;
+ unsigned long flags;
+ struct rq *rq;
+
+ rq = task_rq_lock(tsk, &flags);
+
+ if (tsk->sched_class != &fair_sched_class)
+ goto done;
+
+ update_rq_clock(rq);
+
+ running = task_running(rq, tsk);
+ on_rq = tsk->se.on_rq;
+
+ if (on_rq) {
+ dequeue_task(rq, tsk, 0);
+ if (unlikely(running))
+ tsk->sched_class->put_prev_task(rq, tsk);
+ }
+
+ set_task_cfs_rq(tsk);
+
+ if (on_rq) {
+ if (unlikely(running))
+ tsk->sched_class->set_curr_task(rq);
+ enqueue_task(rq, tsk, 0);
+ }
+
+done:
+ task_rq_unlock(rq, &flags);
+}
+
+static void set_se_shares(struct sched_entity *se, unsigned long shares)
+{
+ struct cfs_rq *cfs_rq = se->cfs_rq;
+ struct rq *rq = cfs_rq->rq;
+ int on_rq;
+
+ spin_lock_irq(&rq->lock);
+
+ on_rq = se->on_rq;
+ if (on_rq)
+ dequeue_entity(cfs_rq, se, 0);
+
+ se->load.weight = shares;
+ se->load.inv_weight = div64_64((1ULL<<32), shares);
+
+ if (on_rq)
+ enqueue_entity(cfs_rq, se, 0);
+
+ spin_unlock_irq(&rq->lock);
+}
+
+int sched_group_set_shares(struct task_group *tg, unsigned long shares)
+{
+ int i;
+
+ spin_lock(&tg->lock);
+ if (tg->shares == shares)
+ goto done;
+
+ tg->shares = shares;
+ for_each_possible_cpu(i)
+ set_se_shares(tg->se[i], shares);
+
+done:
+ spin_unlock(&tg->lock);
+ return 0;
+}
+
+unsigned long sched_group_shares(struct task_group *tg)
+{
+ return tg->shares;
+}
+
+#endif /* CONFIG_FAIR_GROUP_SCHED */
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index c3ee38bd342..a5e517ec07c 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -28,6 +28,31 @@
printk(x); \
} while (0)
+/*
+ * Ease the printing of nsec fields:
+ */
+static long long nsec_high(long long nsec)
+{
+ if (nsec < 0) {
+ nsec = -nsec;
+ do_div(nsec, 1000000);
+ return -nsec;
+ }
+ do_div(nsec, 1000000);
+
+ return nsec;
+}
+
+static unsigned long nsec_low(long long nsec)
+{
+ if (nsec < 0)
+ nsec = -nsec;
+
+ return do_div(nsec, 1000000);
+}
+
+#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
+
static void
print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
{
@@ -36,23 +61,19 @@ print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
else
SEQ_printf(m, " ");
- SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d ",
+ SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
p->comm, p->pid,
- (long long)p->se.fair_key,
- (long long)(p->se.fair_key - rq->cfs.fair_clock),
- (long long)p->se.wait_runtime,
+ SPLIT_NS(p->se.vruntime),
(long long)(p->nvcsw + p->nivcsw),
p->prio);
#ifdef CONFIG_SCHEDSTATS
- SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
- (long long)p->se.sum_exec_runtime,
- (long long)p->se.sum_wait_runtime,
- (long long)p->se.sum_sleep_runtime,
- (long long)p->se.wait_runtime_overruns,
- (long long)p->se.wait_runtime_underruns);
+ SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld\n",
+ SPLIT_NS(p->se.vruntime),
+ SPLIT_NS(p->se.sum_exec_runtime),
+ SPLIT_NS(p->se.sum_sleep_runtime));
#else
- SEQ_printf(m, "%15Ld %15Ld %15Ld %15Ld %15Ld\n",
- 0LL, 0LL, 0LL, 0LL, 0LL);
+ SEQ_printf(m, "%15Ld %15Ld %15Ld.%06ld %15Ld.%06ld %15Ld.%06ld\n",
+ 0LL, 0LL, 0LL, 0L, 0LL, 0L, 0LL, 0L);
#endif
}
@@ -62,14 +83,10 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
SEQ_printf(m,
"\nrunnable tasks:\n"
- " task PID tree-key delta waiting"
- " switches prio"
- " sum-exec sum-wait sum-sleep"
- " wait-overrun wait-underrun\n"
- "------------------------------------------------------------------"
- "----------------"
- "------------------------------------------------"
- "--------------------------------\n");
+ " task PID tree-key switches prio"
+ " exec-runtime sum-exec sum-sleep\n"
+ "------------------------------------------------------"
+ "----------------------------------------------------\n");
read_lock_irq(&tasklist_lock);
@@ -83,45 +100,48 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
read_unlock_irq(&tasklist_lock);
}
-static void
-print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
+void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
{
- s64 wait_runtime_rq_sum = 0;
- struct task_struct *p;
- struct rb_node *curr;
- unsigned long flags;
+ s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
+ spread, rq0_min_vruntime, spread0;
struct rq *rq = &per_cpu(runqueues, cpu);
+ struct sched_entity *last;
+ unsigned long flags;
- spin_lock_irqsave(&rq->lock, flags);
- curr = first_fair(cfs_rq);
- while (curr) {
- p = rb_entry(curr, struct task_struct, se.run_node);
- wait_runtime_rq_sum += p->se.wait_runtime;
-
- curr = rb_next(curr);
- }
- spin_unlock_irqrestore(&rq->lock, flags);
-
- SEQ_printf(m, " .%-30s: %Ld\n", "wait_runtime_rq_sum",
- (long long)wait_runtime_rq_sum);
-}
-
-void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
-{
SEQ_printf(m, "\ncfs_rq\n");
-#define P(x) \
- SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
-
- P(fair_clock);
- P(exec_clock);
- P(wait_runtime);
- P(wait_runtime_overruns);
- P(wait_runtime_underruns);
- P(sleeper_bonus);
-#undef P
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
+ SPLIT_NS(cfs_rq->exec_clock));
- print_cfs_rq_runtime_sum(m, cpu, cfs_rq);
+ spin_lock_irqsave(&rq->lock, flags);
+ if (cfs_rq->rb_leftmost)
+ MIN_vruntime = (__pick_next_entity(cfs_rq))->vruntime;
+ last = __pick_last_entity(cfs_rq);
+ if (last)
+ max_vruntime = last->vruntime;
+ min_vruntime = rq->cfs.min_vruntime;
+ rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
+ spin_unlock_irqrestore(&rq->lock, flags);
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
+ SPLIT_NS(MIN_vruntime));
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime",
+ SPLIT_NS(min_vruntime));
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime",
+ SPLIT_NS(max_vruntime));
+ spread = max_vruntime - MIN_vruntime;
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread",
+ SPLIT_NS(spread));
+ spread0 = min_vruntime - rq0_min_vruntime;
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0",
+ SPLIT_NS(spread0));
+ SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
+ SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
+#ifdef CONFIG_SCHEDSTATS
+ SEQ_printf(m, " .%-30s: %ld\n", "bkl_count",
+ rq->bkl_count);
+#endif
+ SEQ_printf(m, " .%-30s: %ld\n", "nr_spread_over",
+ cfs_rq->nr_spread_over);
}
static void print_cpu(struct seq_file *m, int cpu)
@@ -141,31 +161,32 @@ static void print_cpu(struct seq_file *m, int cpu)
#define P(x) \
SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
+#define PN(x) \
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
P(nr_running);
SEQ_printf(m, " .%-30s: %lu\n", "load",
- rq->ls.load.weight);
- P(ls.delta_fair);
- P(ls.delta_exec);
+ rq->load.weight);
P(nr_switches);
P(nr_load_updates);
P(nr_uninterruptible);
SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies);
- P(next_balance);
+ PN(next_balance);
P(curr->pid);
- P(clock);
- P(idle_clock);
- P(prev_clock_raw);
+ PN(clock);
+ PN(idle_clock);
+ PN(prev_clock_raw);
P(clock_warps);
P(clock_overflows);
P(clock_deep_idle_events);
- P(clock_max_delta);
+ PN(clock_max_delta);
P(cpu_load[0]);
P(cpu_load[1]);
P(cpu_load[2]);
P(cpu_load[3]);
P(cpu_load[4]);
#undef P
+#undef PN
print_cfs_stats(m, cpu);
@@ -177,12 +198,25 @@ static int sched_debug_show(struct seq_file *m, void *v)
u64 now = ktime_to_ns(ktime_get());
int cpu;
- SEQ_printf(m, "Sched Debug Version: v0.05-v20, %s %.*s\n",
+ SEQ_printf(m, "Sched Debug Version: v0.06-v22, %s %.*s\n",
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
- SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
+ SEQ_printf(m, "now at %Lu.%06ld msecs\n", SPLIT_NS(now));
+
+#define P(x) \
+ SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x))
+#define PN(x) \
+ SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
+ PN(sysctl_sched_latency);
+ PN(sysctl_sched_nr_latency);
+ PN(sysctl_sched_wakeup_granularity);
+ PN(sysctl_sched_batch_wakeup_granularity);
+ PN(sysctl_sched_child_runs_first);
+ P(sysctl_sched_features);
+#undef PN
+#undef P
for_each_online_cpu(cpu)
print_cpu(m, cpu);
@@ -202,7 +236,7 @@ static int sched_debug_open(struct inode *inode, struct file *filp)
return single_open(filp, sched_debug_show, NULL);
}
-static struct file_operations sched_debug_fops = {
+static const struct file_operations sched_debug_fops = {
.open = sched_debug_open,
.read = seq_read,
.llseek = seq_lseek,
@@ -226,6 +260,7 @@ __initcall(init_sched_debug_procfs);
void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
{
+ unsigned long nr_switches;
unsigned long flags;
int num_threads = 1;
@@ -237,41 +272,89 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
rcu_read_unlock();
SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
- SEQ_printf(m, "----------------------------------------------\n");
+ SEQ_printf(m,
+ "---------------------------------------------------------\n");
+#define __P(F) \
+ SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
#define P(F) \
- SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
+ SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
+#define __PN(F) \
+ SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
+#define PN(F) \
+ SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
- P(se.wait_runtime);
- P(se.wait_start_fair);
- P(se.exec_start);
- P(se.sleep_start_fair);
- P(se.sum_exec_runtime);
+ PN(se.exec_start);
+ PN(se.vruntime);
+ PN(se.sum_exec_runtime);
+
+ nr_switches = p->nvcsw + p->nivcsw;
#ifdef CONFIG_SCHEDSTATS
- P(se.wait_start);
- P(se.sleep_start);
- P(se.block_start);
- P(se.sleep_max);
- P(se.block_max);
- P(se.exec_max);
- P(se.wait_max);
- P(se.wait_runtime_overruns);
- P(se.wait_runtime_underruns);
- P(se.sum_wait_runtime);
+ PN(se.wait_start);
+ PN(se.sleep_start);
+ PN(se.block_start);
+ PN(se.sleep_max);
+ PN(se.block_max);
+ PN(se.exec_max);
+ PN(se.slice_max);
+ PN(se.wait_max);
+ P(sched_info.bkl_count);
+ P(se.nr_migrations);
+ P(se.nr_migrations_cold);
+ P(se.nr_failed_migrations_affine);
+ P(se.nr_failed_migrations_running);
+ P(se.nr_failed_migrations_hot);
+ P(se.nr_forced_migrations);
+ P(se.nr_forced2_migrations);
+ P(se.nr_wakeups);
+ P(se.nr_wakeups_sync);
+ P(se.nr_wakeups_migrate);
+ P(se.nr_wakeups_local);
+ P(se.nr_wakeups_remote);
+ P(se.nr_wakeups_affine);
+ P(se.nr_wakeups_affine_attempts);
+ P(se.nr_wakeups_passive);
+ P(se.nr_wakeups_idle);
+
+ {
+ u64 avg_atom, avg_per_cpu;
+
+ avg_atom = p->se.sum_exec_runtime;
+ if (nr_switches)
+ do_div(avg_atom, nr_switches);
+ else
+ avg_atom = -1LL;
+
+ avg_per_cpu = p->se.sum_exec_runtime;
+ if (p->se.nr_migrations)
+ avg_per_cpu = div64_64(avg_per_cpu, p->se.nr_migrations);
+ else
+ avg_per_cpu = -1LL;
+
+ __PN(avg_atom);
+ __PN(avg_per_cpu);
+ }
#endif
- SEQ_printf(m, "%-25s:%20Ld\n",
- "nr_switches", (long long)(p->nvcsw + p->nivcsw));
+ __P(nr_switches);
+ SEQ_printf(m, "%-35s:%21Ld\n",
+ "nr_voluntary_switches", (long long)p->nvcsw);
+ SEQ_printf(m, "%-35s:%21Ld\n",
+ "nr_involuntary_switches", (long long)p->nivcsw);
+
P(se.load.weight);
P(policy);
P(prio);
+#undef PN
+#undef __PN
#undef P
+#undef __P
{
u64 t0, t1;
t0 = sched_clock();
t1 = sched_clock();
- SEQ_printf(m, "%-25s:%20Ld\n",
+ SEQ_printf(m, "%-35s:%21Ld\n",
"clock-delta", (long long)(t1-t0));
}
}
@@ -279,9 +362,32 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
void proc_sched_set_task(struct task_struct *p)
{
#ifdef CONFIG_SCHEDSTATS
- p->se.sleep_max = p->se.block_max = p->se.exec_max = p->se.wait_max = 0;
- p->se.wait_runtime_overruns = p->se.wait_runtime_underruns = 0;
+ p->se.wait_max = 0;
+ p->se.sleep_max = 0;
+ p->se.sum_sleep_runtime = 0;
+ p->se.block_max = 0;
+ p->se.exec_max = 0;
+ p->se.slice_max = 0;
+ p->se.nr_migrations = 0;
+ p->se.nr_migrations_cold = 0;
+ p->se.nr_failed_migrations_affine = 0;
+ p->se.nr_failed_migrations_running = 0;
+ p->se.nr_failed_migrations_hot = 0;
+ p->se.nr_forced_migrations = 0;
+ p->se.nr_forced2_migrations = 0;
+ p->se.nr_wakeups = 0;
+ p->se.nr_wakeups_sync = 0;
+ p->se.nr_wakeups_migrate = 0;
+ p->se.nr_wakeups_local = 0;
+ p->se.nr_wakeups_remote = 0;
+ p->se.nr_wakeups_affine = 0;
+ p->se.nr_wakeups_affine_attempts = 0;
+ p->se.nr_wakeups_passive = 0;
+ p->se.nr_wakeups_idle = 0;
+ p->sched_info.bkl_count = 0;
#endif
- p->se.sum_exec_runtime = 0;
- p->se.prev_sum_exec_runtime = 0;
+ p->se.sum_exec_runtime = 0;
+ p->se.prev_sum_exec_runtime = 0;
+ p->nvcsw = 0;
+ p->nivcsw = 0;
}
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 67c67a87146..a17b785d700 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -25,22 +25,26 @@
* (default: 20ms, units: nanoseconds)
*
* NOTE: this latency value is not the same as the concept of
- * 'timeslice length' - timeslices in CFS are of variable length.
- * (to see the precise effective timeslice length of your workload,
- * run vmstat and monitor the context-switches field)
+ * 'timeslice length' - timeslices in CFS are of variable length
+ * and have no persistent notion like in traditional, time-slice
+ * based scheduling concepts.
*
- * On SMP systems the value of this is multiplied by the log2 of the
- * number of CPUs. (i.e. factor 2x on 2-way systems, 3x on 4-way
- * systems, 4x on 8-way systems, 5x on 16-way systems, etc.)
- * Targeted preemption latency for CPU-bound tasks:
+ * (to see the precise effective timeslice length of your workload,
+ * run vmstat and monitor the context-switches (cs) field)
*/
-unsigned int sysctl_sched_latency __read_mostly = 20000000ULL;
+const_debug unsigned int sysctl_sched_latency = 20000000ULL;
+
+/*
+ * After fork, child runs first. (default) If set to 0 then
+ * parent will (try to) run first.
+ */
+const_debug unsigned int sysctl_sched_child_runs_first = 1;
/*
* Minimal preemption granularity for CPU-bound tasks:
* (default: 2 msec, units: nanoseconds)
*/
-unsigned int sysctl_sched_min_granularity __read_mostly = 2000000ULL;
+const_debug unsigned int sysctl_sched_nr_latency = 20;
/*
* sys_sched_yield() compat mode
@@ -52,52 +56,25 @@ unsigned int __read_mostly sysctl_sched_compat_yield;
/*
* SCHED_BATCH wake-up granularity.
- * (default: 25 msec, units: nanoseconds)
+ * (default: 10 msec, units: nanoseconds)
*
* This option delays the preemption effects of decoupled workloads
* and reduces their over-scheduling. Synchronous workloads will still
* have immediate wakeup/sleep latencies.
*/
-unsigned int sysctl_sched_batch_wakeup_granularity __read_mostly = 25000000UL;
+const_debug unsigned int sysctl_sched_batch_wakeup_granularity = 10000000UL;
/*
* SCHED_OTHER wake-up granularity.
- * (default: 1 msec, units: nanoseconds)
+ * (default: 10 msec, units: nanoseconds)
*
* This option delays the preemption effects of decoupled workloads
* and reduces their over-scheduling. Synchronous workloads will still
* have immediate wakeup/sleep latencies.
*/
-unsigned int sysctl_sched_wakeup_granularity __read_mostly = 1000000UL;
-
-unsigned int sysctl_sched_stat_granularity __read_mostly;
-
-/*
- * Initialized in sched_init_granularity() [to 5 times the base granularity]:
- */
-unsigned int sysctl_sched_runtime_limit __read_mostly;
-
-/*
- * Debugging: various feature bits
- */
-enum {
- SCHED_FEAT_FAIR_SLEEPERS = 1,
- SCHED_FEAT_SLEEPER_AVG = 2,
- SCHED_FEAT_SLEEPER_LOAD_AVG = 4,
- SCHED_FEAT_PRECISE_CPU_LOAD = 8,
- SCHED_FEAT_START_DEBIT = 16,
- SCHED_FEAT_SKIP_INITIAL = 32,
-};
+const_debug unsigned int sysctl_sched_wakeup_granularity = 10000000UL;
-unsigned int sysctl_sched_features __read_mostly =
- SCHED_FEAT_FAIR_SLEEPERS *1 |
- SCHED_FEAT_SLEEPER_AVG *0 |
- SCHED_FEAT_SLEEPER_LOAD_AVG *1 |
- SCHED_FEAT_PRECISE_CPU_LOAD *1 |
- SCHED_FEAT_START_DEBIT *1 |
- SCHED_FEAT_SKIP_INITIAL *0;
-
-extern struct sched_class fair_sched_class;
+const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
/**************************************************************
* CFS operations on generic schedulable entities:
@@ -111,21 +88,9 @@ static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
return cfs_rq->rq;
}
-/* currently running entity (if any) on this cfs_rq */
-static inline struct sched_entity *cfs_rq_curr(struct cfs_rq *cfs_rq)
-{
- return cfs_rq->curr;
-}
-
/* An entity is a task if it doesn't "own" a runqueue */
#define entity_is_task(se) (!se->my_q)
-static inline void
-set_cfs_rq_curr(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
- cfs_rq->curr = se;
-}
-
#else /* CONFIG_FAIR_GROUP_SCHED */
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
@@ -133,21 +98,8 @@ static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
return container_of(cfs_rq, struct rq, cfs);
}
-static inline struct sched_entity *cfs_rq_curr(struct cfs_rq *cfs_rq)
-{
- struct rq *rq = rq_of(cfs_rq);
-
- if (unlikely(rq->curr->sched_class != &fair_sched_class))
- return NULL;
-
- return &rq->curr->se;
-}
-
#define entity_is_task(se) 1
-static inline void
-set_cfs_rq_curr(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
-
#endif /* CONFIG_FAIR_GROUP_SCHED */
static inline struct task_struct *task_of(struct sched_entity *se)
@@ -160,16 +112,38 @@ static inline struct task_struct *task_of(struct sched_entity *se)
* Scheduling class tree data structure manipulation methods:
*/
+static inline u64 max_vruntime(u64 min_vruntime, u64 vruntime)
+{
+ s64 delta = (s64)(vruntime - min_vruntime);
+ if (delta > 0)
+ min_vruntime = vruntime;
+
+ return min_vruntime;
+}
+
+static inline u64 min_vruntime(u64 min_vruntime, u64 vruntime)
+{
+ s64 delta = (s64)(vruntime - min_vruntime);
+ if (delta < 0)
+ min_vruntime = vruntime;
+
+ return min_vruntime;
+}
+
+static inline s64 entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+ return se->vruntime - cfs_rq->min_vruntime;
+}
+
/*
* Enqueue an entity into the rb-tree:
*/
-static inline void
-__enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
struct rb_node **link = &cfs_rq->tasks_timeline.rb_node;
struct rb_node *parent = NULL;
struct sched_entity *entry;
- s64 key = se->fair_key;
+ s64 key = entity_key(cfs_rq, se);
int leftmost = 1;
/*
@@ -182,7 +156,7 @@ __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
* We dont care about collisions. Nodes with
* the same key stay together.
*/
- if (key - entry->fair_key < 0) {
+ if (key < entity_key(cfs_rq, entry)) {
link = &parent->rb_left;
} else {
link = &parent->rb_right;
@@ -199,24 +173,14 @@ __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
rb_link_node(&se->run_node, parent, link);
rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline);
- update_load_add(&cfs_rq->load, se->load.weight);
- cfs_rq->nr_running++;
- se->on_rq = 1;
-
- schedstat_add(cfs_rq, wait_runtime, se->wait_runtime);
}
-static inline void
-__dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static void __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
if (cfs_rq->rb_leftmost == &se->run_node)
cfs_rq->rb_leftmost = rb_next(&se->run_node);
- rb_erase(&se->run_node, &cfs_rq->tasks_timeline);
- update_load_sub(&cfs_rq->load, se->load.weight);
- cfs_rq->nr_running--;
- se->on_rq = 0;
- schedstat_add(cfs_rq, wait_runtime, -se->wait_runtime);
+ rb_erase(&se->run_node, &cfs_rq->tasks_timeline);
}
static inline struct rb_node *first_fair(struct cfs_rq *cfs_rq)
@@ -229,118 +193,86 @@ static struct sched_entity *__pick_next_entity(struct cfs_rq *cfs_rq)
return rb_entry(first_fair(cfs_rq), struct sched_entity, run_node);
}
+static inline struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
+{
+ struct rb_node **link = &cfs_rq->tasks_timeline.rb_node;
+ struct sched_entity *se = NULL;
+ struct rb_node *parent;
+
+ while (*link) {
+ parent = *link;
+ se = rb_entry(parent, struct sched_entity, run_node);
+ link = &parent->rb_right;
+ }
+
+ return se;
+}
+
/**************************************************************
* Scheduling class statistics methods:
*/
+
/*
- * Calculate the preemption granularity needed to schedule every
- * runnable task once per sysctl_sched_latency amount of time.
- * (down to a sensible low limit on granularity)
- *
- * For example, if there are 2 tasks running and latency is 10 msecs,
- * we switch tasks every 5 msecs. If we have 3 tasks running, we have
- * to switch tasks every 3.33 msecs to get a 10 msecs observed latency
- * for each task. We do finer and finer scheduling up to until we
- * reach the minimum granularity value.
- *
- * To achieve this we use the following dynamic-granularity rule:
+ * The idea is to set a period in which each task runs once.
*
- * gran = lat/nr - lat/nr/nr
+ * When there are too many tasks (sysctl_sched_nr_latency) we have to stretch
+ * this period because otherwise the slices get too small.
*
- * This comes out of the following equations:
- *
- * kA1 + gran = kB1
- * kB2 + gran = kA2
- * kA2 = kA1
- * kB2 = kB1 - d + d/nr
- * lat = d * nr
- *
- * Where 'k' is key, 'A' is task A (waiting), 'B' is task B (running),
- * '1' is start of time, '2' is end of time, 'd' is delay between
- * 1 and 2 (during which task B was running), 'nr' is number of tasks
- * running, 'lat' is the the period of each task. ('lat' is the
- * sched_latency that we aim for.)
+ * p = (nr <= nl) ? l : l*nr/nl
*/
-static long
-sched_granularity(struct cfs_rq *cfs_rq)
+static u64 __sched_period(unsigned long nr_running)
{
- unsigned int gran = sysctl_sched_latency;
- unsigned int nr = cfs_rq->nr_running;
+ u64 period = sysctl_sched_latency;
+ unsigned long nr_latency = sysctl_sched_nr_latency;
- if (nr > 1) {
- gran = gran/nr - gran/nr/nr;
- gran = max(gran, sysctl_sched_min_granularity);
+ if (unlikely(nr_running > nr_latency)) {
+ period *= nr_running;
+ do_div(period, nr_latency);
}
- return gran;
+ return period;
}
/*
- * We rescale the rescheduling granularity of tasks according to their
- * nice level, but only linearly, not exponentially:
+ * We calculate the wall-time slice from the period by taking a part
+ * proportional to the weight.
+ *
+ * s = p*w/rw
*/
-static long
-niced_granularity(struct sched_entity *curr, unsigned long granularity)
+static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- u64 tmp;
+ u64 slice = __sched_period(cfs_rq->nr_running);
- if (likely(curr->load.weight == NICE_0_LOAD))
- return granularity;
- /*
- * Positive nice levels get the same granularity as nice-0:
- */
- if (likely(curr->load.weight < NICE_0_LOAD)) {
- tmp = curr->load.weight * (u64)granularity;
- return (long) (tmp >> NICE_0_SHIFT);
- }
- /*
- * Negative nice level tasks get linearly finer
- * granularity:
- */
- tmp = curr->load.inv_weight * (u64)granularity;
+ slice *= se->load.weight;
+ do_div(slice, cfs_rq->load.weight);
- /*
- * It will always fit into 'long':
- */
- return (long) (tmp >> (WMULT_SHIFT-NICE_0_SHIFT));
+ return slice;
}
-static inline void
-limit_wait_runtime(struct cfs_rq *cfs_rq, struct sched_entity *se)
+/*
+ * We calculate the vruntime slice.
+ *
+ * vs = s/w = p/rw
+ */
+static u64 __sched_vslice(unsigned long rq_weight, unsigned long nr_running)
{
- long limit = sysctl_sched_runtime_limit;
+ u64 vslice = __sched_period(nr_running);
- /*
- * Niced tasks have the same history dynamic range as
- * non-niced tasks:
- */
- if (unlikely(se->wait_runtime > limit)) {
- se->wait_runtime = limit;
- schedstat_inc(se, wait_runtime_overruns);
- schedstat_inc(cfs_rq, wait_runtime_overruns);
- }
- if (unlikely(se->wait_runtime < -limit)) {
- se->wait_runtime = -limit;
- schedstat_inc(se, wait_runtime_underruns);
- schedstat_inc(cfs_rq, wait_runtime_underruns);
- }
+ do_div(vslice, rq_weight);
+
+ return vslice;
}
-static inline void
-__add_wait_runtime(struct cfs_rq *cfs_rq, struct sched_entity *se, long delta)
+static u64 sched_vslice(struct cfs_rq *cfs_rq)
{
- se->wait_runtime += delta;
- schedstat_add(se, sum_wait_runtime, delta);
- limit_wait_runtime(cfs_rq, se);
+ return __sched_vslice(cfs_rq->load.weight, cfs_rq->nr_running);
}
-static void
-add_wait_runtime(struct cfs_rq *cfs_rq, struct sched_entity *se, long delta)
+static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- schedstat_add(cfs_rq, wait_runtime, -se->wait_runtime);
- __add_wait_runtime(cfs_rq, se, delta);
- schedstat_add(cfs_rq, wait_runtime, se->wait_runtime);
+ return __sched_vslice(cfs_rq->load.weight + se->load.weight,
+ cfs_rq->nr_running + 1);
}
/*
@@ -348,46 +280,41 @@ add_wait_runtime(struct cfs_rq *cfs_rq, struct sched_entity *se, long delta)
* are not in our scheduling class.
*/
static inline void
-__update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr)
+__update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
+ unsigned long delta_exec)
{
- unsigned long delta, delta_exec, delta_fair, delta_mine;
- struct load_weight *lw = &cfs_rq->load;
- unsigned long load = lw->weight;
+ unsigned long delta_exec_weighted;
+ u64 vruntime;
- delta_exec = curr->delta_exec;
schedstat_set(curr->exec_max, max((u64)delta_exec, curr->exec_max));
curr->sum_exec_runtime += delta_exec;
- cfs_rq->exec_clock += delta_exec;
-
- if (unlikely(!load))
- return;
-
- delta_fair = calc_delta_fair(delta_exec, lw);
- delta_mine = calc_delta_mine(delta_exec, curr->load.weight, lw);
-
- if (cfs_rq->sleeper_bonus > sysctl_sched_min_granularity) {
- delta = min((u64)delta_mine, cfs_rq->sleeper_bonus);
- delta = min(delta, (unsigned long)(
- (long)sysctl_sched_runtime_limit - curr->wait_runtime));
- cfs_rq->sleeper_bonus -= delta;
- delta_mine -= delta;
+ schedstat_add(cfs_rq, exec_clock, delta_exec);
+ delta_exec_weighted = delta_exec;
+ if (unlikely(curr->load.weight != NICE_0_LOAD)) {
+ delta_exec_weighted = calc_delta_fair(delta_exec_weighted,
+ &curr->load);
}
+ curr->vruntime += delta_exec_weighted;
- cfs_rq->fair_clock += delta_fair;
/*
- * We executed delta_exec amount of time on the CPU,
- * but we were only entitled to delta_mine amount of
- * time during that period (if nr_running == 1 then
- * the two values are equal)
- * [Note: delta_mine - delta_exec is negative]:
+ * maintain cfs_rq->min_vruntime to be a monotonic increasing
+ * value tracking the leftmost vruntime in the tree.
*/
- add_wait_runtime(cfs_rq, curr, delta_mine - delta_exec);
+ if (first_fair(cfs_rq)) {
+ vruntime = min_vruntime(curr->vruntime,
+ __pick_next_entity(cfs_rq)->vruntime);
+ } else
+ vruntime = curr->vruntime;
+
+ cfs_rq->min_vruntime =
+ max_vruntime(cfs_rq->min_vruntime, vruntime);
}
static void update_curr(struct cfs_rq *cfs_rq)
{
- struct sched_entity *curr = cfs_rq_curr(cfs_rq);
+ struct sched_entity *curr = cfs_rq->curr;
+ u64 now = rq_of(cfs_rq)->clock;
unsigned long delta_exec;
if (unlikely(!curr))
@@ -398,135 +325,47 @@ static void update_curr(struct cfs_rq *cfs_rq)
* since the last time we changed load (this cannot
* overflow on 32 bits):
*/
- delta_exec = (unsigned long)(rq_of(cfs_rq)->clock - curr->exec_start);
+ delta_exec = (unsigned long)(now - curr->exec_start);
- curr->delta_exec += delta_exec;
-
- if (unlikely(curr->delta_exec > sysctl_sched_stat_granularity)) {
- __update_curr(cfs_rq, curr);
- curr->delta_exec = 0;
- }
- curr->exec_start = rq_of(cfs_rq)->clock;
+ __update_curr(cfs_rq, curr, delta_exec);
+ curr->exec_start = now;
}
static inline void
update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- se->wait_start_fair = cfs_rq->fair_clock;
schedstat_set(se->wait_start, rq_of(cfs_rq)->clock);
}
/*
- * We calculate fair deltas here, so protect against the random effects
- * of a multiplication overflow by capping it to the runtime limit:
- */
-#if BITS_PER_LONG == 32
-static inline unsigned long
-calc_weighted(unsigned long delta, unsigned long weight, int shift)
-{
- u64 tmp = (u64)delta * weight >> shift;
-
- if (unlikely(tmp > sysctl_sched_runtime_limit*2))
- return sysctl_sched_runtime_limit*2;
- return tmp;
-}
-#else
-static inline unsigned long
-calc_weighted(unsigned long delta, unsigned long weight, int shift)
-{
- return delta * weight >> shift;
-}
-#endif
-
-/*
* Task is being enqueued - update stats:
*/
static void update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- s64 key;
-
/*
* Are we enqueueing a waiting task? (for current tasks
* a dequeue/enqueue event is a NOP)
*/
- if (se != cfs_rq_curr(cfs_rq))
+ if (se != cfs_rq->curr)
update_stats_wait_start(cfs_rq, se);
- /*
- * Update the key:
- */
- key = cfs_rq->fair_clock;
-
- /*
- * Optimize the common nice 0 case:
- */
- if (likely(se->load.weight == NICE_0_LOAD)) {
- key -= se->wait_runtime;
- } else {
- u64 tmp;
-
- if (se->wait_runtime < 0) {
- tmp = -se->wait_runtime;
- key += (tmp * se->load.inv_weight) >>
- (WMULT_SHIFT - NICE_0_SHIFT);
- } else {
- tmp = se->wait_runtime;
- key -= (tmp * se->load.inv_weight) >>
- (WMULT_SHIFT - NICE_0_SHIFT);
- }
- }
-
- se->fair_key = key;
-}
-
-/*
- * Note: must be called with a freshly updated rq->fair_clock.
- */
-static inline void
-__update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
- unsigned long delta_fair = se->delta_fair_run;
-
- schedstat_set(se->wait_max, max(se->wait_max,
- rq_of(cfs_rq)->clock - se->wait_start));
-
- if (unlikely(se->load.weight != NICE_0_LOAD))
- delta_fair = calc_weighted(delta_fair, se->load.weight,
- NICE_0_SHIFT);
-
- add_wait_runtime(cfs_rq, se, delta_fair);
}
static void
update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- unsigned long delta_fair;
-
- if (unlikely(!se->wait_start_fair))
- return;
-
- delta_fair = (unsigned long)min((u64)(2*sysctl_sched_runtime_limit),
- (u64)(cfs_rq->fair_clock - se->wait_start_fair));
-
- se->delta_fair_run += delta_fair;
- if (unlikely(abs(se->delta_fair_run) >=
- sysctl_sched_stat_granularity)) {
- __update_stats_wait_end(cfs_rq, se);
- se->delta_fair_run = 0;
- }
-
- se->wait_start_fair = 0;
+ schedstat_set(se->wait_max, max(se->wait_max,
+ rq_of(cfs_rq)->clock - se->wait_start));
schedstat_set(se->wait_start, 0);
}
static inline void
update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- update_curr(cfs_rq);
/*
* Mark the end of the wait period if dequeueing a
* waiting task:
*/
- if (se != cfs_rq_curr(cfs_rq))
+ if (se != cfs_rq->curr)
update_stats_wait_end(cfs_rq, se);
}
@@ -542,79 +381,28 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
se->exec_start = rq_of(cfs_rq)->clock;
}
-/*
- * We are descheduling a task - update its stats:
- */
-static inline void
-update_stats_curr_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
- se->exec_start = 0;
-}
-
/**************************************************
* Scheduling class queueing methods:
*/
-static void __enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static void
+account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- unsigned long load = cfs_rq->load.weight, delta_fair;
- long prev_runtime;
-
- /*
- * Do not boost sleepers if there's too much bonus 'in flight'
- * already:
- */
- if (unlikely(cfs_rq->sleeper_bonus > sysctl_sched_runtime_limit))
- return;
-
- if (sysctl_sched_features & SCHED_FEAT_SLEEPER_LOAD_AVG)
- load = rq_of(cfs_rq)->cpu_load[2];
-
- delta_fair = se->delta_fair_sleep;
-
- /*
- * Fix up delta_fair with the effect of us running
- * during the whole sleep period:
- */
- if (sysctl_sched_features & SCHED_FEAT_SLEEPER_AVG)
- delta_fair = div64_likely32((u64)delta_fair * load,
- load + se->load.weight);
-
- if (unlikely(se->load.weight != NICE_0_LOAD))
- delta_fair = calc_weighted(delta_fair, se->load.weight,
- NICE_0_SHIFT);
-
- prev_runtime = se->wait_runtime;
- __add_wait_runtime(cfs_rq, se, delta_fair);
- delta_fair = se->wait_runtime - prev_runtime;
+ update_load_add(&cfs_rq->load, se->load.weight);
+ cfs_rq->nr_running++;
+ se->on_rq = 1;
+}
- /*
- * Track the amount of bonus we've given to sleepers:
- */
- cfs_rq->sleeper_bonus += delta_fair;
+static void
+account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+ update_load_sub(&cfs_rq->load, se->load.weight);
+ cfs_rq->nr_running--;
+ se->on_rq = 0;
}
static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- struct task_struct *tsk = task_of(se);
- unsigned long delta_fair;
-
- if ((entity_is_task(se) && tsk->policy == SCHED_BATCH) ||
- !(sysctl_sched_features & SCHED_FEAT_FAIR_SLEEPERS))
- return;
-
- delta_fair = (unsigned long)min((u64)(2*sysctl_sched_runtime_limit),
- (u64)(cfs_rq->fair_clock - se->sleep_start_fair));
-
- se->delta_fair_sleep += delta_fair;
- if (unlikely(abs(se->delta_fair_sleep) >=
- sysctl_sched_stat_granularity)) {
- __enqueue_sleeper(cfs_rq, se);
- se->delta_fair_sleep = 0;
- }
-
- se->sleep_start_fair = 0;
-
#ifdef CONFIG_SCHEDSTATS
if (se->sleep_start) {
u64 delta = rq_of(cfs_rq)->clock - se->sleep_start;
@@ -646,6 +434,8 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
* time that the task spent sleeping:
*/
if (unlikely(prof_on == SLEEP_PROFILING)) {
+ struct task_struct *tsk = task_of(se);
+
profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk),
delta >> 20);
}
@@ -653,27 +443,81 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
#endif
}
+static void check_spread(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+#ifdef CONFIG_SCHED_DEBUG
+ s64 d = se->vruntime - cfs_rq->min_vruntime;
+
+ if (d < 0)
+ d = -d;
+
+ if (d > 3*sysctl_sched_latency)
+ schedstat_inc(cfs_rq, nr_spread_over);
+#endif
+}
+
+static void
+place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
+{
+ u64 vruntime;
+
+ vruntime = cfs_rq->min_vruntime;
+
+ if (sched_feat(TREE_AVG)) {
+ struct sched_entity *last = __pick_last_entity(cfs_rq);
+ if (last) {
+ vruntime += last->vruntime;
+ vruntime >>= 1;
+ }
+ } else if (sched_feat(APPROX_AVG) && cfs_rq->nr_running)
+ vruntime += sched_vslice(cfs_rq)/2;
+
+ if (initial && sched_feat(START_DEBIT))
+ vruntime += sched_vslice_add(cfs_rq, se);
+
+ if (!initial) {
+ if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) &&
+ task_of(se)->policy != SCHED_BATCH)
+ vruntime -= sysctl_sched_latency;
+
+ vruntime = max_t(s64, vruntime, se->vruntime);
+ }
+
+ se->vruntime = vruntime;
+
+}
+
static void
enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup)
{
/*
- * Update the fair clock.
+ * Update run-time statistics of the 'current'.
*/
update_curr(cfs_rq);
- if (wakeup)
+ if (wakeup) {
+ place_entity(cfs_rq, se, 0);
enqueue_sleeper(cfs_rq, se);
+ }
update_stats_enqueue(cfs_rq, se);
- __enqueue_entity(cfs_rq, se);
+ check_spread(cfs_rq, se);
+ if (se != cfs_rq->curr)
+ __enqueue_entity(cfs_rq, se);
+ account_entity_enqueue(cfs_rq, se);
}
static void
dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
{
+ /*
+ * Update run-time statistics of the 'current'.
+ */
+ update_curr(cfs_rq);
+
update_stats_dequeue(cfs_rq, se);
if (sleep) {
- se->sleep_start_fair = cfs_rq->fair_clock;
+ se->peer_preempt = 0;
#ifdef CONFIG_SCHEDSTATS
if (entity_is_task(se)) {
struct task_struct *tsk = task_of(se);
@@ -685,68 +529,66 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
}
#endif
}
- __dequeue_entity(cfs_rq, se);
+
+ if (se != cfs_rq->curr)
+ __dequeue_entity(cfs_rq, se);
+ account_entity_dequeue(cfs_rq, se);
}
/*
* Preempt the current task with a newly woken task if needed:
*/
static void
-__check_preempt_curr_fair(struct cfs_rq *cfs_rq, struct sched_entity *se,
- struct sched_entity *curr, unsigned long granularity)
+check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
{
- s64 __delta = curr->fair_key - se->fair_key;
unsigned long ideal_runtime, delta_exec;
- /*
- * ideal_runtime is compared against sum_exec_runtime, which is
- * walltime, hence do not scale.
- */
- ideal_runtime = max(sysctl_sched_latency / cfs_rq->nr_running,
- (unsigned long)sysctl_sched_min_granularity);
-
- /*
- * If we executed more than what the latency constraint suggests,
- * reduce the rescheduling granularity. This way the total latency
- * of how much a task is not scheduled converges to
- * sysctl_sched_latency:
- */
+ ideal_runtime = sched_slice(cfs_rq, curr);
delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
- if (delta_exec > ideal_runtime)
- granularity = 0;
-
- /*
- * Take scheduling granularity into account - do not
- * preempt the current task unless the best task has
- * a larger than sched_granularity fairness advantage:
- *
- * scale granularity as key space is in fair_clock.
- */
- if (__delta > niced_granularity(curr, granularity))
+ if (delta_exec > ideal_runtime ||
+ (sched_feat(PREEMPT_RESTRICT) && curr->peer_preempt))
resched_task(rq_of(cfs_rq)->curr);
+ curr->peer_preempt = 0;
}
-static inline void
+static void
set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
+ /* 'current' is not kept within the tree. */
+ if (se->on_rq) {
+ /*
+ * Any task has to be enqueued before it get to execute on
+ * a CPU. So account for the time it spent waiting on the
+ * runqueue.
+ */
+ update_stats_wait_end(cfs_rq, se);
+ __dequeue_entity(cfs_rq, se);
+ }
+
+ update_stats_curr_start(cfs_rq, se);
+ cfs_rq->curr = se;
+#ifdef CONFIG_SCHEDSTATS
/*
- * Any task has to be enqueued before it get to execute on
- * a CPU. So account for the time it spent waiting on the
- * runqueue. (note, here we rely on pick_next_task() having
- * done a put_prev_task_fair() shortly before this, which
- * updated rq->fair_clock - used by update_stats_wait_end())
+ * Track our maximum slice length, if the CPU's load is at
+ * least twice that of our own weight (i.e. dont track it
+ * when there are only lesser-weight tasks around):
*/
- update_stats_wait_end(cfs_rq, se);
- update_stats_curr_start(cfs_rq, se);
- set_cfs_rq_curr(cfs_rq, se);
+ if (rq_of(cfs_rq)->load.weight >= 2*se->load.weight) {
+ se->slice_max = max(se->slice_max,
+ se->sum_exec_runtime - se->prev_sum_exec_runtime);
+ }
+#endif
se->prev_sum_exec_runtime = se->sum_exec_runtime;
}
static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq)
{
- struct sched_entity *se = __pick_next_entity(cfs_rq);
+ struct sched_entity *se = NULL;
- set_next_entity(cfs_rq, se);
+ if (first_fair(cfs_rq)) {
+ se = __pick_next_entity(cfs_rq);
+ set_next_entity(cfs_rq, se);
+ }
return se;
}
@@ -760,33 +602,24 @@ static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev)
if (prev->on_rq)
update_curr(cfs_rq);
- update_stats_curr_end(cfs_rq, prev);
-
- if (prev->on_rq)
+ check_spread(cfs_rq, prev);
+ if (prev->on_rq) {
update_stats_wait_start(cfs_rq, prev);
- set_cfs_rq_curr(cfs_rq, NULL);
+ /* Put 'current' back into the tree. */
+ __enqueue_entity(cfs_rq, prev);
+ }
+ cfs_rq->curr = NULL;
}
static void entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
{
- struct sched_entity *next;
-
/*
- * Dequeue and enqueue the task to update its
- * position within the tree:
+ * Update run-time statistics of the 'current'.
*/
- dequeue_entity(cfs_rq, curr, 0);
- enqueue_entity(cfs_rq, curr, 0);
-
- /*
- * Reschedule if another task tops the current one.
- */
- next = __pick_next_entity(cfs_rq);
- if (next == curr)
- return;
+ update_curr(cfs_rq);
- __check_preempt_curr_fair(cfs_rq, next, curr,
- sched_granularity(cfs_rq));
+ if (cfs_rq->nr_running > 1 || !sched_feat(WAKEUP_PREEMPT))
+ check_preempt_tick(cfs_rq, curr);
}
/**************************************************
@@ -821,23 +654,28 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
*/
static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
{
- /* A later patch will take group into account */
- return &cpu_rq(this_cpu)->cfs;
+ return cfs_rq->tg->cfs_rq[this_cpu];
}
/* Iterate thr' all leaf cfs_rq's on a runqueue */
#define for_each_leaf_cfs_rq(rq, cfs_rq) \
list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list)
-/* Do the two (enqueued) tasks belong to the same group ? */
-static inline int is_same_group(struct task_struct *curr, struct task_struct *p)
+/* Do the two (enqueued) entities belong to the same group ? */
+static inline int
+is_same_group(struct sched_entity *se, struct sched_entity *pse)
{
- if (curr->se.cfs_rq == p->se.cfs_rq)
+ if (se->cfs_rq == pse->cfs_rq)
return 1;
return 0;
}
+static inline struct sched_entity *parent_entity(struct sched_entity *se)
+{
+ return se->parent;
+}
+
#else /* CONFIG_FAIR_GROUP_SCHED */
#define for_each_sched_entity(se) \
@@ -870,11 +708,17 @@ static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu)
#define for_each_leaf_cfs_rq(rq, cfs_rq) \
for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL)
-static inline int is_same_group(struct task_struct *curr, struct task_struct *p)
+static inline int
+is_same_group(struct sched_entity *se, struct sched_entity *pse)
{
return 1;
}
+static inline struct sched_entity *parent_entity(struct sched_entity *se)
+{
+ return NULL;
+}
+
#endif /* CONFIG_FAIR_GROUP_SCHED */
/*
@@ -892,6 +736,7 @@ static void enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup)
break;
cfs_rq = cfs_rq_of(se);
enqueue_entity(cfs_rq, se, wakeup);
+ wakeup = 1;
}
}
@@ -911,6 +756,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep)
/* Don't dequeue parent if it has other entities besides us */
if (cfs_rq->load.weight)
break;
+ sleep = 1;
}
}
@@ -919,12 +765,10 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep)
*
* If compat_yield is turned on then we requeue to the end of the tree.
*/
-static void yield_task_fair(struct rq *rq, struct task_struct *p)
+static void yield_task_fair(struct rq *rq)
{
- struct cfs_rq *cfs_rq = task_cfs_rq(p);
- struct rb_node **link = &cfs_rq->tasks_timeline.rb_node;
- struct sched_entity *rightmost, *se = &p->se;
- struct rb_node *parent;
+ struct cfs_rq *cfs_rq = task_cfs_rq(rq->curr);
+ struct sched_entity *rightmost, *se = &rq->curr->se;
/*
* Are we the only task in the tree?
@@ -935,52 +779,39 @@ static void yield_task_fair(struct rq *rq, struct task_struct *p)
if (likely(!sysctl_sched_compat_yield)) {
__update_rq_clock(rq);
/*
- * Dequeue and enqueue the task to update its
- * position within the tree:
+ * Update run-time statistics of the 'current'.
*/
- dequeue_entity(cfs_rq, &p->se, 0);
- enqueue_entity(cfs_rq, &p->se, 0);
+ update_curr(cfs_rq);
return;
}
/*
* Find the rightmost entry in the rbtree:
*/
- do {
- parent = *link;
- link = &parent->rb_right;
- } while (*link);
-
- rightmost = rb_entry(parent, struct sched_entity, run_node);
+ rightmost = __pick_last_entity(cfs_rq);
/*
* Already in the rightmost position?
*/
- if (unlikely(rightmost == se))
+ if (unlikely(rightmost->vruntime < se->vruntime))
return;
/*
* Minimally necessary key value to be last in the tree:
+ * Upon rescheduling, sched_class::put_prev_task() will place
+ * 'current' within the tree based on its new key value.
*/
- se->fair_key = rightmost->fair_key + 1;
-
- if (cfs_rq->rb_leftmost == &se->run_node)
- cfs_rq->rb_leftmost = rb_next(&se->run_node);
- /*
- * Relink the task to the rightmost position:
- */
- rb_erase(&se->run_node, &cfs_rq->tasks_timeline);
- rb_link_node(&se->run_node, parent, link);
- rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline);
+ se->vruntime = rightmost->vruntime + 1;
}
/*
* Preempt the current task with a newly woken task if needed:
*/
-static void check_preempt_curr_fair(struct rq *rq, struct task_struct *p)
+static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
{
struct task_struct *curr = rq->curr;
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
- unsigned long gran;
+ struct sched_entity *se = &curr->se, *pse = &p->se;
+ s64 delta, gran;
if (unlikely(rt_prio(p->prio))) {
update_rq_clock(rq);
@@ -988,16 +819,31 @@ static void check_preempt_curr_fair(struct rq *rq, struct task_struct *p)
resched_task(curr);
return;
}
-
- gran = sysctl_sched_wakeup_granularity;
/*
- * Batch tasks prefer throughput over latency:
+ * Batch tasks do not preempt (their preemption is driven by
+ * the tick):
*/
if (unlikely(p->policy == SCHED_BATCH))
- gran = sysctl_sched_batch_wakeup_granularity;
+ return;
+
+ if (sched_feat(WAKEUP_PREEMPT)) {
+ while (!is_same_group(se, pse)) {
+ se = parent_entity(se);
+ pse = parent_entity(pse);
+ }
- if (is_same_group(curr, p))
- __check_preempt_curr_fair(cfs_rq, &p->se, &curr->se, gran);
+ delta = se->vruntime - pse->vruntime;
+ gran = sysctl_sched_wakeup_granularity;
+ if (unlikely(se->load.weight != NICE_0_LOAD))
+ gran = calc_delta_fair(gran, &se->load);
+
+ if (delta > gran) {
+ int now = !sched_feat(PREEMPT_RESTRICT);
+
+ if (now || p->prio < curr->prio || !se->peer_preempt++)
+ resched_task(curr);
+ }
+ }
}
static struct task_struct *pick_next_task_fair(struct rq *rq)
@@ -1041,7 +887,7 @@ static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
* achieve that by always pre-iterating before returning
* the current task:
*/
-static inline struct task_struct *
+static struct task_struct *
__load_balance_iterator(struct cfs_rq *cfs_rq, struct rb_node *curr)
{
struct task_struct *p;
@@ -1078,7 +924,10 @@ static int cfs_rq_best_prio(struct cfs_rq *cfs_rq)
if (!cfs_rq->nr_running)
return MAX_PRIO;
- curr = __pick_next_entity(cfs_rq);
+ curr = cfs_rq->curr;
+ if (!curr)
+ curr = __pick_next_entity(cfs_rq);
+
p = task_of(curr);
return p->prio;
@@ -1153,6 +1002,8 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr)
}
}
+#define swap(a,b) do { typeof(a) tmp = (a); (a) = (b); (b) = tmp; } while (0)
+
/*
* Share the fairness runtime between parent and child, thus the
* total amount of pressure for CPU stays equal - new tasks
@@ -1163,37 +1014,32 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr)
static void task_new_fair(struct rq *rq, struct task_struct *p)
{
struct cfs_rq *cfs_rq = task_cfs_rq(p);
- struct sched_entity *se = &p->se, *curr = cfs_rq_curr(cfs_rq);
+ struct sched_entity *se = &p->se, *curr = cfs_rq->curr;
+ int this_cpu = smp_processor_id();
sched_info_queued(p);
update_curr(cfs_rq);
- update_stats_enqueue(cfs_rq, se);
- /*
- * Child runs first: we let it run before the parent
- * until it reschedules once. We set up the key so that
- * it will preempt the parent:
- */
- se->fair_key = curr->fair_key -
- niced_granularity(curr, sched_granularity(cfs_rq)) - 1;
- /*
- * The first wait is dominated by the child-runs-first logic,
- * so do not credit it with that waiting time yet:
- */
- if (sysctl_sched_features & SCHED_FEAT_SKIP_INITIAL)
- se->wait_start_fair = 0;
+ place_entity(cfs_rq, se, 1);
- /*
- * The statistical average of wait_runtime is about
- * -granularity/2, so initialize the task with that:
- */
- if (sysctl_sched_features & SCHED_FEAT_START_DEBIT)
- se->wait_runtime = -(sched_granularity(cfs_rq) / 2);
+ if (sysctl_sched_child_runs_first && this_cpu == task_cpu(p) &&
+ curr->vruntime < se->vruntime) {
+ /*
+ * Upon rescheduling, sched_class::put_prev_task() will place
+ * 'current' within the tree based on its new key value.
+ */
+ swap(curr->vruntime, se->vruntime);
+ }
+ update_stats_enqueue(cfs_rq, se);
+ check_spread(cfs_rq, se);
+ check_spread(cfs_rq, curr);
__enqueue_entity(cfs_rq, se);
+ account_entity_enqueue(cfs_rq, se);
+ se->peer_preempt = 0;
+ resched_task(rq->curr);
}
-#ifdef CONFIG_FAIR_GROUP_SCHED
/* Account for a task changing its policy or group.
*
* This routine is mostly called to set cfs_rq->curr field when a task
@@ -1206,21 +1052,17 @@ static void set_curr_task_fair(struct rq *rq)
for_each_sched_entity(se)
set_next_entity(cfs_rq_of(se), se);
}
-#else
-static void set_curr_task_fair(struct rq *rq)
-{
-}
-#endif
/*
* All the scheduling class methods:
*/
-struct sched_class fair_sched_class __read_mostly = {
+static const struct sched_class fair_sched_class = {
+ .next = &idle_sched_class,
.enqueue_task = enqueue_task_fair,
.dequeue_task = dequeue_task_fair,
.yield_task = yield_task_fair,
- .check_preempt_curr = check_preempt_curr_fair,
+ .check_preempt_curr = check_preempt_wakeup,
.pick_next_task = pick_next_task_fair,
.put_prev_task = put_prev_task_fair,
@@ -1237,6 +1079,9 @@ static void print_cfs_stats(struct seq_file *m, int cpu)
{
struct cfs_rq *cfs_rq;
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs);
+#endif
for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
print_cfs_rq(m, cpu, cfs_rq);
}
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 3503fb2d9f9..6e2ead41516 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -50,10 +50,15 @@ static void task_tick_idle(struct rq *rq, struct task_struct *curr)
{
}
+static void set_curr_task_idle(struct rq *rq)
+{
+}
+
/*
* Simple, special scheduling class for the per-CPU idle tasks:
*/
-static struct sched_class idle_sched_class __read_mostly = {
+const struct sched_class idle_sched_class = {
+ /* .next is NULL */
/* no enqueue/yield_task for idle tasks */
/* dequeue is not valid, we print a debug message there: */
@@ -66,6 +71,7 @@ static struct sched_class idle_sched_class __read_mostly = {
.load_balance = load_balance_idle,
+ .set_curr_task = set_curr_task_idle,
.task_tick = task_tick_idle,
/* no .task_new for idle tasks */
};
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 4b87476a02d..d0097a0634e 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -7,7 +7,7 @@
* Update the current task's runtime statistics. Skip current tasks that
* are not in our scheduling class.
*/
-static inline void update_curr_rt(struct rq *rq)
+static void update_curr_rt(struct rq *rq)
{
struct task_struct *curr = rq->curr;
u64 delta_exec;
@@ -59,9 +59,9 @@ static void requeue_task_rt(struct rq *rq, struct task_struct *p)
}
static void
-yield_task_rt(struct rq *rq, struct task_struct *p)
+yield_task_rt(struct rq *rq)
{
- requeue_task_rt(rq, p);
+ requeue_task_rt(rq, rq->curr);
}
/*
@@ -206,7 +206,7 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p)
if (--p->time_slice)
return;
- p->time_slice = static_prio_timeslice(p->static_prio);
+ p->time_slice = DEF_TIMESLICE;
/*
* Requeue to the end of queue if we are not the only element
@@ -218,7 +218,15 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p)
}
}
-static struct sched_class rt_sched_class __read_mostly = {
+static void set_curr_task_rt(struct rq *rq)
+{
+ struct task_struct *p = rq->curr;
+
+ p->se.exec_start = rq->clock;
+}
+
+const struct sched_class rt_sched_class = {
+ .next = &fair_sched_class,
.enqueue_task = enqueue_task_rt,
.dequeue_task = dequeue_task_rt,
.yield_task = yield_task_rt,
@@ -230,5 +238,6 @@ static struct sched_class rt_sched_class __read_mostly = {
.load_balance = load_balance_rt,
+ .set_curr_task = set_curr_task_rt,
.task_tick = task_tick_rt,
};
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index c20a94dda61..1c084842c3e 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -16,18 +16,18 @@ static int show_schedstat(struct seq_file *seq, void *v)
struct rq *rq = cpu_rq(cpu);
#ifdef CONFIG_SMP
struct sched_domain *sd;
- int dcnt = 0;
+ int dcount = 0;
#endif
/* runqueue-specific stats */
seq_printf(seq,
"cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %llu %llu %lu",
cpu, rq->yld_both_empty,
- rq->yld_act_empty, rq->yld_exp_empty, rq->yld_cnt,
- rq->sched_switch, rq->sched_cnt, rq->sched_goidle,
- rq->ttwu_cnt, rq->ttwu_local,
+ rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
+ rq->sched_switch, rq->sched_count, rq->sched_goidle,
+ rq->ttwu_count, rq->ttwu_local,
rq->rq_sched_info.cpu_time,
- rq->rq_sched_info.run_delay, rq->rq_sched_info.pcnt);
+ rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
seq_printf(seq, "\n");
@@ -39,12 +39,12 @@ static int show_schedstat(struct seq_file *seq, void *v)
char mask_str[NR_CPUS];
cpumask_scnprintf(mask_str, NR_CPUS, sd->span);
- seq_printf(seq, "domain%d %s", dcnt++, mask_str);
+ seq_printf(seq, "domain%d %s", dcount++, mask_str);
for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
itype++) {
seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu "
"%lu",
- sd->lb_cnt[itype],
+ sd->lb_count[itype],
sd->lb_balanced[itype],
sd->lb_failed[itype],
sd->lb_imbalance[itype],
@@ -55,9 +55,9 @@ static int show_schedstat(struct seq_file *seq, void *v)
}
seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu %lu %lu"
" %lu %lu %lu\n",
- sd->alb_cnt, sd->alb_failed, sd->alb_pushed,
- sd->sbe_cnt, sd->sbe_balanced, sd->sbe_pushed,
- sd->sbf_cnt, sd->sbf_balanced, sd->sbf_pushed,
+ sd->alb_count, sd->alb_failed, sd->alb_pushed,
+ sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
+ sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
sd->ttwu_wake_remote, sd->ttwu_move_affine,
sd->ttwu_move_balance);
}
@@ -101,7 +101,7 @@ rq_sched_info_arrive(struct rq *rq, unsigned long long delta)
{
if (rq) {
rq->rq_sched_info.run_delay += delta;
- rq->rq_sched_info.pcnt++;
+ rq->rq_sched_info.pcount++;
}
}
@@ -129,7 +129,7 @@ rq_sched_info_depart(struct rq *rq, unsigned long long delta)
# define schedstat_set(var, val) do { } while (0)
#endif
-#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
+#ifdef CONFIG_SCHEDSTATS
/*
* Called when a process is dequeued from the active array and given
* the cpu. We should note that with the exception of interactive
@@ -164,7 +164,7 @@ static void sched_info_arrive(struct task_struct *t)
sched_info_dequeued(t);
t->sched_info.run_delay += delta;
t->sched_info.last_arrival = now;
- t->sched_info.pcnt++;
+ t->sched_info.pcount++;
rq_sched_info_arrive(task_rq(t), delta);
}
@@ -233,5 +233,5 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
#else
#define sched_info_queued(t) do { } while (0)
#define sched_info_switch(t, next) do { } while (0)
-#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
+#endif /* CONFIG_SCHEDSTATS */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c7314f95264..96efbb85999 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -222,14 +222,11 @@ static ctl_table kern_table[] = {
#ifdef CONFIG_SCHED_DEBUG
{
.ctl_name = CTL_UNNUMBERED,
- .procname = "sched_min_granularity_ns",
- .data = &sysctl_sched_min_granularity,
+ .procname = "sched_nr_latency",
+ .data = &sysctl_sched_nr_latency,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &min_sched_granularity_ns,
- .extra2 = &max_sched_granularity_ns,
+ .proc_handler = &proc_dointvec,
},
{
.ctl_name = CTL_UNNUMBERED,
@@ -266,38 +263,24 @@ static ctl_table kern_table[] = {
},
{
.ctl_name = CTL_UNNUMBERED,
- .procname = "sched_stat_granularity_ns",
- .data = &sysctl_sched_stat_granularity,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &min_wakeup_granularity_ns,
- .extra2 = &max_wakeup_granularity_ns,
- },
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "sched_runtime_limit_ns",
- .data = &sysctl_sched_runtime_limit,
+ .procname = "sched_child_runs_first",
+ .data = &sysctl_sched_child_runs_first,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = &min_sched_granularity_ns,
- .extra2 = &max_sched_granularity_ns,
+ .proc_handler = &proc_dointvec,
},
{
.ctl_name = CTL_UNNUMBERED,
- .procname = "sched_child_runs_first",
- .data = &sysctl_sched_child_runs_first,
+ .procname = "sched_features",
+ .data = &sysctl_sched_features,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = CTL_UNNUMBERED,
- .procname = "sched_features",
- .data = &sysctl_sched_features,
+ .procname = "sched_migration_cost",
+ .data = &sysctl_sched_migration_cost,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec,
@@ -897,6 +880,14 @@ static ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &hugetlb_treat_movable_handler,
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "hugetlb_dynamic_pool",
+ .data = &hugetlb_dynamic_pool,
+ .maxlen = sizeof(hugetlb_dynamic_pool),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
#endif
{
.ctl_name = VM_LOWMEM_RESERVE_RATIO,
@@ -1053,7 +1044,7 @@ static ctl_table vm_table[] = {
.strategy = &sysctl_string,
},
#endif
-#if defined(CONFIG_X86_32) || \
+#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
(defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
{
.ctl_name = VM_VDSO_ENABLED,
diff --git a/kernel/time.c b/kernel/time.c
index 2289a8d6831..1afcc78dc3b 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -57,11 +57,7 @@ EXPORT_SYMBOL(sys_tz);
*/
asmlinkage long sys_time(time_t __user * tloc)
{
- time_t i;
- struct timespec tv;
-
- getnstimeofday(&tv);
- i = tv.tv_sec;
+ time_t i = get_seconds();
if (tloc) {
if (put_user(i,tloc))
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index f6635112654..8d53106a0a9 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -23,3 +23,8 @@ config HIGH_RES_TIMERS
hardware is not capable then this option only increases
the size of the kernel image.
+config GENERIC_CLOCKEVENTS_BUILD
+ bool
+ default y
+ depends on GENERIC_CLOCKEVENTS || GENERIC_CLOCKEVENTS_MIGR
+
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index 99b6034fc86..905b0b50792 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -1,6 +1,6 @@
obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o
-obj-$(CONFIG_GENERIC_CLOCKEVENTS) += clockevents.o
+obj-$(CONFIG_GENERIC_CLOCKEVENTS_BUILD) += clockevents.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) += tick-broadcast.o
obj-$(CONFIG_TICK_ONESHOT) += tick-oneshot.o
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 41dd3105ce7..822beebe664 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -194,6 +194,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
local_irq_restore(flags);
}
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
/**
* clockevents_notify - notification about relevant events
*/
@@ -222,4 +223,4 @@ void clockevents_notify(unsigned long reason, void *arg)
spin_unlock(&clockevents_lock);
}
EXPORT_SYMBOL_GPL(clockevents_notify);
-
+#endif
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 0962e057766..fc3fc79b3d5 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -64,8 +64,9 @@ static void tick_broadcast_start_periodic(struct clock_event_device *bc)
*/
int tick_check_broadcast_device(struct clock_event_device *dev)
{
- if (tick_broadcast_device.evtdev ||
- (dev->features & CLOCK_EVT_FEAT_C3STOP))
+ if ((tick_broadcast_device.evtdev &&
+ tick_broadcast_device.evtdev->rating >= dev->rating) ||
+ (dev->features & CLOCK_EVT_FEAT_C3STOP))
return 0;
clockevents_exchange_device(NULL, dev);
@@ -176,8 +177,6 @@ static void tick_do_periodic_broadcast(void)
*/
static void tick_handle_periodic_broadcast(struct clock_event_device *dev)
{
- dev->next_event.tv64 = KTIME_MAX;
-
tick_do_periodic_broadcast();
/*
@@ -218,26 +217,43 @@ static void tick_do_broadcast_on_off(void *why)
bc = tick_broadcast_device.evtdev;
/*
- * Is the device in broadcast mode forever or is it not
- * affected by the powerstate ?
+ * Is the device not affected by the powerstate ?
*/
- if (!dev || !tick_device_is_functional(dev) ||
- !(dev->features & CLOCK_EVT_FEAT_C3STOP))
+ if (!dev || !(dev->features & CLOCK_EVT_FEAT_C3STOP))
goto out;
- if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_ON) {
+ /*
+ * Defect device ?
+ */
+ if (!tick_device_is_functional(dev)) {
+ /*
+ * AMD C1E wreckage fixup:
+ *
+ * Device was registered functional in the first
+ * place. Now the secondary CPU detected the C1E
+ * misfeature and notifies us to fix it up
+ */
+ if (*reason != CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
+ goto out;
+ }
+
+ switch (*reason) {
+ case CLOCK_EVT_NOTIFY_BROADCAST_ON:
+ case CLOCK_EVT_NOTIFY_BROADCAST_FORCE:
if (!cpu_isset(cpu, tick_broadcast_mask)) {
cpu_set(cpu, tick_broadcast_mask);
if (td->mode == TICKDEV_MODE_PERIODIC)
clockevents_set_mode(dev,
CLOCK_EVT_MODE_SHUTDOWN);
}
- } else {
+ break;
+ case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
if (cpu_isset(cpu, tick_broadcast_mask)) {
cpu_clear(cpu, tick_broadcast_mask);
if (td->mode == TICKDEV_MODE_PERIODIC)
tick_setup_periodic(dev, 0);
}
+ break;
}
if (cpus_empty(tick_broadcast_mask))
@@ -515,11 +531,9 @@ static void tick_broadcast_clear_oneshot(int cpu)
*/
void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
{
- if (bc->mode != CLOCK_EVT_MODE_ONESHOT) {
- bc->event_handler = tick_handle_oneshot_broadcast;
- clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
- bc->next_event.tv64 = KTIME_MAX;
- }
+ bc->event_handler = tick_handle_oneshot_broadcast;
+ clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
+ bc->next_event.tv64 = KTIME_MAX;
}
/*
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 77a21abc871..1bea399a9ef 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -200,7 +200,7 @@ static int tick_check_new_device(struct clock_event_device *newdev)
cpu = smp_processor_id();
if (!cpu_isset(cpu, newdev->cpumask))
- goto out;
+ goto out_bc;
td = &per_cpu(tick_cpu_device, cpu);
curdev = td->evtdev;
@@ -265,7 +265,7 @@ out_bc:
*/
if (tick_check_broadcast_device(newdev))
ret = NOTIFY_STOP;
-out:
+
spin_unlock_irqrestore(&tick_device_lock, flags);
return ret;
@@ -345,6 +345,7 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason,
case CLOCK_EVT_NOTIFY_BROADCAST_ON:
case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
+ case CLOCK_EVT_NOTIFY_BROADCAST_FORCE:
tick_broadcast_on_off(reason, dev);
break;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 4ad79f6bdec..7e8983aecf8 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -49,19 +49,12 @@ struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
static unsigned long total_sleep_time; /* seconds */
EXPORT_SYMBOL(xtime);
-
-#ifdef CONFIG_NO_HZ
static struct timespec xtime_cache __attribute__ ((aligned (16)));
static inline void update_xtime_cache(u64 nsec)
{
xtime_cache = xtime;
timespec_add_ns(&xtime_cache, nsec);
}
-#else
-#define xtime_cache xtime
-/* We do *not* want to evaluate the argument for this case */
-#define update_xtime_cache(n) do { } while (0)
-#endif
static struct clocksource *clock; /* pointer to current clocksource */
diff --git a/kernel/user.c b/kernel/user.c
index 9ca2848fc35..f0e561e6d08 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -50,12 +50,16 @@ struct user_struct root_user = {
.uid_keyring = &root_user_keyring,
.session_keyring = &root_session_keyring,
#endif
+#ifdef CONFIG_FAIR_USER_SCHED
+ .tg = &init_task_group,
+#endif
};
/*
* These routines must be called with the uidhash spinlock held!
*/
-static inline void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
+static inline void uid_hash_insert(struct user_struct *up,
+ struct hlist_head *hashent)
{
hlist_add_head(&up->uidhash_node, hashent);
}
@@ -65,13 +69,14 @@ static inline void uid_hash_remove(struct user_struct *up)
hlist_del_init(&up->uidhash_node);
}
-static inline struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
+static inline struct user_struct *uid_hash_find(uid_t uid,
+ struct hlist_head *hashent)
{
struct user_struct *user;
struct hlist_node *h;
hlist_for_each_entry(user, h, hashent, uidhash_node) {
- if(user->uid == uid) {
+ if (user->uid == uid) {
atomic_inc(&user->__count);
return user;
}
@@ -80,6 +85,203 @@ static inline struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *ha
return NULL;
}
+#ifdef CONFIG_FAIR_USER_SCHED
+
+static struct kobject uids_kobject; /* represents /sys/kernel/uids directory */
+static DEFINE_MUTEX(uids_mutex);
+
+static void sched_destroy_user(struct user_struct *up)
+{
+ sched_destroy_group(up->tg);
+}
+
+static int sched_create_user(struct user_struct *up)
+{
+ int rc = 0;
+
+ up->tg = sched_create_group();
+ if (IS_ERR(up->tg))
+ rc = -ENOMEM;
+
+ return rc;
+}
+
+static void sched_switch_user(struct task_struct *p)
+{
+ sched_move_task(p);
+}
+
+static inline void uids_mutex_lock(void)
+{
+ mutex_lock(&uids_mutex);
+}
+
+static inline void uids_mutex_unlock(void)
+{
+ mutex_unlock(&uids_mutex);
+}
+
+/* return cpu shares held by the user */
+ssize_t cpu_shares_show(struct kset *kset, char *buffer)
+{
+ struct user_struct *up = container_of(kset, struct user_struct, kset);
+
+ return sprintf(buffer, "%lu\n", sched_group_shares(up->tg));
+}
+
+/* modify cpu shares held by the user */
+ssize_t cpu_shares_store(struct kset *kset, const char *buffer, size_t size)
+{
+ struct user_struct *up = container_of(kset, struct user_struct, kset);
+ unsigned long shares;
+ int rc;
+
+ sscanf(buffer, "%lu", &shares);
+
+ rc = sched_group_set_shares(up->tg, shares);
+
+ return (rc ? rc : size);
+}
+
+static void user_attr_init(struct subsys_attribute *sa, char *name, int mode)
+{
+ sa->attr.name = name;
+ sa->attr.mode = mode;
+ sa->show = cpu_shares_show;
+ sa->store = cpu_shares_store;
+}
+
+/* Create "/sys/kernel/uids/<uid>" directory and
+ * "/sys/kernel/uids/<uid>/cpu_share" file for this user.
+ */
+static int user_kobject_create(struct user_struct *up)
+{
+ struct kset *kset = &up->kset;
+ struct kobject *kobj = &kset->kobj;
+ int error;
+
+ memset(kset, 0, sizeof(struct kset));
+ kobj->parent = &uids_kobject; /* create under /sys/kernel/uids dir */
+ kobject_set_name(kobj, "%d", up->uid);
+ kset_init(kset);
+ user_attr_init(&up->user_attr, "cpu_share", 0644);
+
+ error = kobject_add(kobj);
+ if (error)
+ goto done;
+
+ error = sysfs_create_file(kobj, &up->user_attr.attr);
+ if (error)
+ kobject_del(kobj);
+
+ kobject_uevent(kobj, KOBJ_ADD);
+
+done:
+ return error;
+}
+
+/* create these in sysfs filesystem:
+ * "/sys/kernel/uids" directory
+ * "/sys/kernel/uids/0" directory (for root user)
+ * "/sys/kernel/uids/0/cpu_share" file (for root user)
+ */
+int __init uids_kobject_init(void)
+{
+ int error;
+
+ /* create under /sys/kernel dir */
+ uids_kobject.parent = &kernel_subsys.kobj;
+ uids_kobject.kset = &kernel_subsys;
+ kobject_set_name(&uids_kobject, "uids");
+ kobject_init(&uids_kobject);
+
+ error = kobject_add(&uids_kobject);
+ if (!error)
+ error = user_kobject_create(&root_user);
+
+ return error;
+}
+
+/* work function to remove sysfs directory for a user and free up
+ * corresponding structures.
+ */
+static void remove_user_sysfs_dir(struct work_struct *w)
+{
+ struct user_struct *up = container_of(w, struct user_struct, work);
+ struct kobject *kobj = &up->kset.kobj;
+ unsigned long flags;
+ int remove_user = 0;
+
+ /* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
+ * atomic.
+ */
+ uids_mutex_lock();
+
+ local_irq_save(flags);
+
+ if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) {
+ uid_hash_remove(up);
+ remove_user = 1;
+ spin_unlock_irqrestore(&uidhash_lock, flags);
+ } else {
+ local_irq_restore(flags);
+ }
+
+ if (!remove_user)
+ goto done;
+
+ sysfs_remove_file(kobj, &up->user_attr.attr);
+ kobject_uevent(kobj, KOBJ_REMOVE);
+ kobject_del(kobj);
+
+ sched_destroy_user(up);
+ key_put(up->uid_keyring);
+ key_put(up->session_keyring);
+ kmem_cache_free(uid_cachep, up);
+
+done:
+ uids_mutex_unlock();
+}
+
+/* IRQs are disabled and uidhash_lock is held upon function entry.
+ * IRQ state (as stored in flags) is restored and uidhash_lock released
+ * upon function exit.
+ */
+static inline void free_user(struct user_struct *up, unsigned long flags)
+{
+ /* restore back the count */
+ atomic_inc(&up->__count);
+ spin_unlock_irqrestore(&uidhash_lock, flags);
+
+ INIT_WORK(&up->work, remove_user_sysfs_dir);
+ schedule_work(&up->work);
+}
+
+#else /* CONFIG_FAIR_USER_SCHED */
+
+static void sched_destroy_user(struct user_struct *up) { }
+static int sched_create_user(struct user_struct *up) { return 0; }
+static void sched_switch_user(struct task_struct *p) { }
+static inline int user_kobject_create(struct user_struct *up) { return 0; }
+static inline void uids_mutex_lock(void) { }
+static inline void uids_mutex_unlock(void) { }
+
+/* IRQs are disabled and uidhash_lock is held upon function entry.
+ * IRQ state (as stored in flags) is restored and uidhash_lock released
+ * upon function exit.
+ */
+static inline void free_user(struct user_struct *up, unsigned long flags)
+{
+ uid_hash_remove(up);
+ spin_unlock_irqrestore(&uidhash_lock, flags);
+ sched_destroy_user(up);
+ key_put(up->uid_keyring);
+ key_put(up->session_keyring);
+ kmem_cache_free(uid_cachep, up);
+}
+
+#endif /* CONFIG_FAIR_USER_SCHED */
+
/*
* Locate the user_struct for the passed UID. If found, take a ref on it. The
* caller must undo that ref with free_uid().
@@ -106,15 +308,10 @@ void free_uid(struct user_struct *up)
return;
local_irq_save(flags);
- if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) {
- uid_hash_remove(up);
- spin_unlock_irqrestore(&uidhash_lock, flags);
- key_put(up->uid_keyring);
- key_put(up->session_keyring);
- kmem_cache_free(uid_cachep, up);
- } else {
+ if (atomic_dec_and_lock(&up->__count, &uidhash_lock))
+ free_user(up, flags);
+ else
local_irq_restore(flags);
- }
}
struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
@@ -122,6 +319,11 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
struct hlist_head *hashent = uidhashentry(ns, uid);
struct user_struct *up;
+ /* Make uid_hash_find() + user_kobject_create() + uid_hash_insert()
+ * atomic.
+ */
+ uids_mutex_lock();
+
spin_lock_irq(&uidhash_lock);
up = uid_hash_find(uid, hashent);
spin_unlock_irq(&uidhash_lock);
@@ -150,6 +352,22 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
return NULL;
}
+ if (sched_create_user(new) < 0) {
+ key_put(new->uid_keyring);
+ key_put(new->session_keyring);
+ kmem_cache_free(uid_cachep, new);
+ return NULL;
+ }
+
+ if (user_kobject_create(new)) {
+ sched_destroy_user(new);
+ key_put(new->uid_keyring);
+ key_put(new->session_keyring);
+ kmem_cache_free(uid_cachep, new);
+ uids_mutex_unlock();
+ return NULL;
+ }
+
/*
* Before adding this, check whether we raced
* on adding the same user already..
@@ -157,6 +375,11 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
spin_lock_irq(&uidhash_lock);
up = uid_hash_find(uid, hashent);
if (up) {
+ /* This case is not possible when CONFIG_FAIR_USER_SCHED
+ * is defined, since we serialize alloc_uid() using
+ * uids_mutex. Hence no need to call
+ * sched_destroy_user() or remove_user_sysfs_dir().
+ */
key_put(new->uid_keyring);
key_put(new->session_keyring);
kmem_cache_free(uid_cachep, new);
@@ -167,6 +390,9 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid)
spin_unlock_irq(&uidhash_lock);
}
+
+ uids_mutex_unlock();
+
return up;
}
@@ -184,6 +410,7 @@ void switch_uid(struct user_struct *new_user)
atomic_dec(&old_user->processes);
switch_uid_keyring(new_user);
current->user = new_user;
+ sched_switch_user(current);
/*
* We need to synchronize with __sigqueue_alloc()
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-23 03:58:31 +0000