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sched: Keep kthreads at default priority 

Removes kthread/workqueue priority boost, they increase worst-case
desktop latencies.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1252486344.28645.18.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2009-09-09 15:41:37 +02:00 committed by Ingo Molnar
parent 172e082a91
commit 61cbe54d94
2 changed files with 0 additions and 6 deletions
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4
kernel/kthread.c
View File

@ -16,8 +16,6 @@
#include <linux/mutex.h>
#include <trace/events/sched.h>
#define KTHREAD_NICE_LEVEL (-5)
static DEFINE_SPINLOCK(kthread_create_lock);
static LIST_HEAD(kthread_create_list);
struct task_struct *kthreadd_task;
@ -145,7 +143,6 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
* The kernel thread should not inherit these properties.
*/
sched_setscheduler_nocheck(create.result, SCHED_NORMAL, &param);
set_user_nice(create.result, KTHREAD_NICE_LEVEL);
set_cpus_allowed_ptr(create.result, cpu_all_mask);
}
return create.result;
@ -221,7 +218,6 @@ 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, KTHREAD_NICE_LEVEL);
set_cpus_allowed_ptr(tsk, cpu_all_mask);
set_mems_allowed(node_possible_map);

2
kernel/workqueue.c
View File

@ -317,8 +317,6 @@ static int worker_thread(void *__cwq)
if (cwq->wq->freezeable)
set_freezable();
set_user_nice(current, -5);
for (;;) {
prepare_to_wait(&cwq->more_work, &wait, TASK_INTERRUPTIBLE);
if (!freezing(current) &&