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authorMichal Schmidt <mschmidt@redhat.com>2008-01-25 21:08:33 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:33 +0100
commit4f05b98d54b140ed3c5851d5d5156e9918c6305d (patch)
treef12f09c1e54e72adf4724b94733cb5b08e0879f7
parent1ad82fd547c716f96e544b477e0bdbfa2d647529 (diff)
sched: fix, always create kernel threads with normal priority
Ensure that the kernel threads are created with the usual nice level and affinity even if kthreadd's properties were changed from the default by root. Signed-off-by: Michal Schmidt <mschmidt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/kthread.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index dcfe724300e..0ac887882f9 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -15,6 +15,8 @@
#include <linux/mutex.h>
#include <asm/semaphore.h>
+#define KTHREAD_NICE_LEVEL (-5)
+
static DEFINE_SPINLOCK(kthread_create_lock);
static LIST_HEAD(kthread_create_list);
struct task_struct *kthreadd_task;
@@ -94,10 +96,18 @@ static void create_kthread(struct kthread_create_info *create)
if (pid < 0) {
create->result = ERR_PTR(pid);
} else {
+ struct sched_param param = { .sched_priority = 0 };
wait_for_completion(&create->started);
read_lock(&tasklist_lock);
create->result = find_task_by_pid(pid);
read_unlock(&tasklist_lock);
+ /*
+ * root may have changed our (kthreadd's) priority or CPU mask.
+ * The kernel thread should not inherit these properties.
+ */
+ sched_setscheduler(create->result, SCHED_NORMAL, &param);
+ set_user_nice(create->result, KTHREAD_NICE_LEVEL);
+ set_cpus_allowed(create->result, CPU_MASK_ALL);
}
complete(&create->done);
}
@@ -221,7 +231,7 @@ int kthreadd(void *unused)
/* Setup a clean context for our children to inherit. */
set_task_comm(tsk, "kthreadd");
ignore_signals(tsk);
- set_user_nice(tsk, -5);
+ set_user_nice(tsk, KTHREAD_NICE_LEVEL);
set_cpus_allowed(tsk, CPU_MASK_ALL);
current->flags |= PF_NOFREEZE;