sched: Add WF_FORK
Avoid the cache buddies from biasing the time distribution away from fork()ers. Normally the next buddy will be the preferred scheduling target, but this makes fork()s prefer to run the new child, whereas we prefer to run the parent, since that will generate more work. 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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@ -1028,6 +1028,7 @@ struct sched_domain;
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* wake flags
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*/
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#define WF_SYNC 0x01 /* waker goes to sleep after wakup */
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#define WF_FORK 0x02 /* child wakeup after fork */
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struct sched_class {
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const struct sched_class *next;
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@ -2602,7 +2602,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
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inc_nr_running(rq);
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}
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trace_sched_wakeup_new(rq, p, 1);
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check_preempt_curr(rq, p, 0);
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check_preempt_curr(rq, p, WF_FORK);
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#ifdef CONFIG_SMP
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if (p->sched_class->task_wake_up)
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p->sched_class->task_wake_up(rq, p);
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@ -1580,7 +1580,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int flags
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*/
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if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
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set_last_buddy(se);
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if (sched_feat(NEXT_BUDDY))
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if (sched_feat(NEXT_BUDDY) && !(flags & WF_FORK))
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set_next_buddy(pse);
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/*
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