sched: Allow SCHED_BATCH to preempt SCHED_IDLE tasks
Perform the test for SCHED_IDLE before testing for SCHED_BATCH (and ensure idle tasks don't preempt idle tasks) so the non-interactive, but still important, SCHED_BATCH tasks will run in favor of the very low priority SCHED_IDLE tasks. Signed-off-by: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> Cc: Richard Purdie <richard.purdie@linuxfoundation.org> LKML-Reference: <1298408674-3130-2-git-send-email-dvhart@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
e0a92c1747
commit
a2f5c9ab79
|
@ -1870,16 +1870,18 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_
|
||||||
if (test_tsk_need_resched(curr))
|
if (test_tsk_need_resched(curr))
|
||||||
return;
|
return;
|
||||||
|
|
||||||
|
/* Idle tasks are by definition preempted by non-idle tasks. */
|
||||||
|
if (unlikely(curr->policy == SCHED_IDLE) &&
|
||||||
|
likely(p->policy != SCHED_IDLE))
|
||||||
|
goto preempt;
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Batch and idle tasks do not preempt (their preemption is driven by
|
* Batch and idle tasks do not preempt non-idle tasks (their preemption
|
||||||
* the tick):
|
* is driven by the tick):
|
||||||
*/
|
*/
|
||||||
if (unlikely(p->policy != SCHED_NORMAL))
|
if (unlikely(p->policy != SCHED_NORMAL))
|
||||||
return;
|
return;
|
||||||
|
|
||||||
/* Idle tasks are by definition preempted by everybody. */
|
|
||||||
if (unlikely(curr->policy == SCHED_IDLE))
|
|
||||||
goto preempt;
|
|
||||||
|
|
||||||
if (!sched_feat(WAKEUP_PREEMPT))
|
if (!sched_feat(WAKEUP_PREEMPT))
|
||||||
return;
|
return;
|
||||||
|
|
Loading…
Reference in a new issue