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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-11-04 21:25:10 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-05 10:30:15 +0100 |
| commit | 02479099c286894644f8e96c6bbb535ab64662fd (patch) | |
| tree | df25bc51ddb31a44c91b672311b532de626fadcb | |
| parent | 4793241be408b3926ee00c704d7da3b3faf3a05f (diff) | |
| download | linux-02479099c286894644f8e96c6bbb535ab64662fd.tar.gz | |
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>
| -rw-r--r-- | kernel/sched_fair.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index a6b1db8a0bd8..51aa3e102acb 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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 |