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authorIngo Molnar <mingo@elte.hu>2008-07-21 17:19:50 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-21 17:19:50 +0200
commiteb6a12c2428d21a9f3e0f1a50e927d5fd80fc3d0 (patch)
tree5ac6f43899648abeab1d43aad3107f664e7f13d5 /net/sunrpc/svc.c
parentc4762aba0b1f72659aae9ce37b772ca8bd8f06f4 (diff)
parent14b395e35d1afdd8019d11b92e28041fad591b71 (diff)
Merge branch 'linus' into cpus4096-for-linus
Conflicts: net/sunrpc/svc.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'net/sunrpc/svc.c')
-rw-r--r--net/sunrpc/svc.c112
1 files changed, 41 insertions, 71 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 083d1268813..835d2741308 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -18,6 +18,7 @@
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/kthread.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/xdr.h>
@@ -291,15 +292,14 @@ svc_pool_map_put(void)
/*
- * Set the current thread's cpus_allowed mask so that it
+ * Set the given thread's cpus_allowed mask so that it
* will only run on cpus in the given pool.
- *
- * Returns 1 and fills in oldmask iff a cpumask was applied.
*/
-static inline int
-svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask)
+static inline void
+svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
{
struct svc_pool_map *m = &svc_pool_map;
+ unsigned int node = m->pool_to[pidx];
/*
* The caller checks for sv_nrpools > 1, which
@@ -307,27 +307,18 @@ svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask)
*/
BUG_ON(m->count == 0);
- switch (m->mode)
- {
- default:
- return 0;
+ switch (m->mode) {
case SVC_POOL_PERCPU:
{
- unsigned int cpu = m->pool_to[pidx];
- cpumask_of_cpu_ptr(cpumask, cpu);
-
- *oldmask = current->cpus_allowed;
- set_cpus_allowed_ptr(current, cpumask);
- return 1;
+ cpumask_of_cpu_ptr(cpumask, node);
+ set_cpus_allowed_ptr(task, cpumask);
+ break;
}
case SVC_POOL_PERNODE:
{
- unsigned int node = m->pool_to[pidx];
node_to_cpumask_ptr(nodecpumask, node);
-
- *oldmask = current->cpus_allowed;
- set_cpus_allowed_ptr(current, nodecpumask);
- return 1;
+ set_cpus_allowed_ptr(task, nodecpumask);
+ break;
}
}
}
@@ -444,7 +435,7 @@ EXPORT_SYMBOL(svc_create);
struct svc_serv *
svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
void (*shutdown)(struct svc_serv *serv),
- svc_thread_fn func, int sig, struct module *mod)
+ svc_thread_fn func, struct module *mod)
{
struct svc_serv *serv;
unsigned int npools = svc_pool_map_get();
@@ -453,7 +444,6 @@ svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
if (serv != NULL) {
serv->sv_function = func;
- serv->sv_kill_signal = sig;
serv->sv_module = mod;
}
@@ -462,7 +452,8 @@ svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
EXPORT_SYMBOL(svc_create_pooled);
/*
- * Destroy an RPC service. Should be called with the BKL held
+ * Destroy an RPC service. Should be called with appropriate locking to
+ * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
*/
void
svc_destroy(struct svc_serv *serv)
@@ -579,46 +570,6 @@ out_enomem:
EXPORT_SYMBOL(svc_prepare_thread);
/*
- * Create a thread in the given pool. Caller must hold BKL.
- * On a NUMA or SMP machine, with a multi-pool serv, the thread
- * will be restricted to run on the cpus belonging to the pool.
- */
-static int
-__svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
- struct svc_pool *pool)
-{
- struct svc_rqst *rqstp;
- int error = -ENOMEM;
- int have_oldmask = 0;
- cpumask_t uninitialized_var(oldmask);
-
- rqstp = svc_prepare_thread(serv, pool);
- if (IS_ERR(rqstp)) {
- error = PTR_ERR(rqstp);
- goto out;
- }
-
- if (serv->sv_nrpools > 1)
- have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask);
-
- error = kernel_thread((int (*)(void *)) func, rqstp, 0);
-
- if (have_oldmask)
- set_cpus_allowed_ptr(current, &oldmask);
-
- if (error < 0)
- goto out_thread;
- svc_sock_update_bufs(serv);
- error = 0;
-out:
- return error;
-
-out_thread:
- svc_exit_thread(rqstp);
- goto out;
-}
-
-/*
* Choose a pool in which to create a new thread, for svc_set_num_threads
*/
static inline struct svc_pool *
@@ -675,7 +626,7 @@ found_pool:
* of threads the given number. If `pool' is non-NULL, applies
* only to threads in that pool, otherwise round-robins between
* all pools. Must be called with a svc_get() reference and
- * the BKL held.
+ * the BKL or another lock to protect access to svc_serv fields.
*
* Destroying threads relies on the service threads filling in
* rqstp->rq_task, which only the nfs ones do. Assumes the serv
@@ -687,7 +638,9 @@ found_pool:
int
svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
{
- struct task_struct *victim;
+ struct svc_rqst *rqstp;
+ struct task_struct *task;
+ struct svc_pool *chosen_pool;
int error = 0;
unsigned int state = serv->sv_nrthreads-1;
@@ -703,18 +656,34 @@ svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
/* create new threads */
while (nrservs > 0) {
nrservs--;
+ chosen_pool = choose_pool(serv, pool, &state);
+
+ rqstp = svc_prepare_thread(serv, chosen_pool);
+ if (IS_ERR(rqstp)) {
+ error = PTR_ERR(rqstp);
+ break;
+ }
+
__module_get(serv->sv_module);
- error = __svc_create_thread(serv->sv_function, serv,
- choose_pool(serv, pool, &state));
- if (error < 0) {
+ task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
+ if (IS_ERR(task)) {
+ error = PTR_ERR(task);
module_put(serv->sv_module);
+ svc_exit_thread(rqstp);
break;
}
+
+ rqstp->rq_task = task;
+ if (serv->sv_nrpools > 1)
+ svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
+
+ svc_sock_update_bufs(serv);
+ wake_up_process(task);
}
/* destroy old threads */
while (nrservs < 0 &&
- (victim = choose_victim(serv, pool, &state)) != NULL) {
- send_sig(serv->sv_kill_signal, victim, 1);
+ (task = choose_victim(serv, pool, &state)) != NULL) {
+ send_sig(SIGINT, task, 1);
nrservs++;
}
@@ -723,7 +692,8 @@ svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
EXPORT_SYMBOL(svc_set_num_threads);
/*
- * Called from a server thread as it's exiting. Caller must hold BKL.
+ * Called from a server thread as it's exiting. Caller must hold the BKL or
+ * the "service mutex", whichever is appropriate for the service.
*/
void
svc_exit_thread(struct svc_rqst *rqstp)