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sched: Complete buddy switches
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Add a NEXT_BUDDY feature flag to aid in debugging.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Mike Galbraith authored and Ingo Molnar committed Sep 15, 2009
1 parent e6b1b2c commit 3cb63d5
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Showing 2 changed files with 3 additions and 1 deletion.
3 changes: 2 additions & 1 deletion kernel/sched_fair.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1501,7 +1501,8 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
*/
if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
set_last_buddy(se);
set_next_buddy(pse);
if (sched_feat(NEXT_BUDDY))
set_next_buddy(pse);

/*
* We can come here with TIF_NEED_RESCHED already set from new task
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1 change: 1 addition & 0 deletions kernel/sched_features.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,5 +14,6 @@ SCHED_FEAT(LB_WAKEUP_UPDATE, 1)
SCHED_FEAT(ASYM_EFF_LOAD, 1)
SCHED_FEAT(WAKEUP_SYNC, 0)
SCHED_FEAT(WAKEUP_OVERLAP, 0)
SCHED_FEAT(NEXT_BUDDY, 1)
SCHED_FEAT(LAST_BUDDY, 1)
SCHED_FEAT(OWNER_SPIN, 1)

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