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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-09-14 20:02:34 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-15 16:51:31 +0200
commita7558e01056f5191ff2ecff53b075dcb9e484188 (patch)
tree1364bbf9273ce353f4f3146aebe567f79b7c8cad /kernel
parent7d47872146398dbede13223299fe1cb368ebc781 (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c2
-rw-r--r--kernel/sched_fair.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 4da335cec8e..0d4c4fea331 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2602,7 +2602,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
inc_nr_running(rq);
}
trace_sched_wakeup_new(rq, p, 1);
- check_preempt_curr(rq, p, 0);
+ check_preempt_curr(rq, p, WF_FORK);
#ifdef CONFIG_SMP
if (p->sched_class->task_wake_up)
p->sched_class->task_wake_up(rq, p);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 007958e3c93..6766959c7f4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1580,7 +1580,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int flags
*/
if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
set_last_buddy(se);
- if (sched_feat(NEXT_BUDDY))
+ if (sched_feat(NEXT_BUDDY) && !(flags & WF_FORK))
set_next_buddy(pse);
/*