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sched: fix buddies for group scheduling 

Impact: scheduling order fix for group scheduling

For each level in the hierarchy, set the buddy to point to the right entity.
Therefore, when we do the hierarchical schedule, we have a fair chance of
ending up where we meant to.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-11-04 21:25:10 +01:00 committed by Ingo Molnar
parent 4793241be4
commit 02479099c2
1 changed files with 14 additions and 2 deletions
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16
kernel/sched_fair.c
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@ -1319,6 +1319,18 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
return 0;
}
static void set_last_buddy(struct sched_entity *se)
{
for_each_sched_entity(se)
cfs_rq_of(se)->last = se;
}
static void set_next_buddy(struct sched_entity *se)
{
for_each_sched_entity(se)
cfs_rq_of(se)->next = se;
}
/*
* Preempt the current task with a newly woken task if needed:
*/
@ -1352,8 +1364,8 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
* obvious reasons its a bad idea to schedule back to the idle thread.
*/
if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
cfs_rq_of(se)->last = se;
cfs_rq_of(pse)->next = pse;
set_last_buddy(se);
set_next_buddy(pse);
/*
* We can come here with TIF_NEED_RESCHED already set from new task