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Commit 61cbe54d authored by Mike Galbraith's avatar Mike Galbraith Committed by Ingo Molnar
Browse files

sched: Keep kthreads at default priority 



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

Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1252486344.28645.18.camel@marge.simson.net>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 172e082a

kernel/kthread.c

+0 −4
Original line number Diff line number Diff line
@@ -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);

kernel/workqueue.c

+0 −2
Original line number Diff line number Diff line
@@ -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) &&