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sched: fix, always create kernel threads with normal priority

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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>
This commit is contained in:
Michal Schmidt 2008-01-25 21:08:33 +01:00 committed by Ingo Molnar
parent 1ad82fd547
commit 4f05b98d54
1 changed files with 11 additions and 1 deletions
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12
kernel/kthread.c
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@ -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;