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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:14 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:14 +0200 |
| commit | 00bf7bfc2eaf775b634774e9ec435d720b6ecee7 (patch) | |
| tree | 1f816516361276a56b9dee6b39e90361dc3468be /kernel | |
| parent | 0702e3ebc1e42576a04d29f8adacf13be825b800 (diff) | |
| download | op-kernel-dev-00bf7bfc2eaf775b634774e9ec435d720b6ecee7.zip op-kernel-dev-00bf7bfc2eaf775b634774e9ec435d720b6ecee7.tar.gz | |
sched: fix: move the CPU check into ->task_new_fair()
noticed by Peter Zijlstra:
fix: move the CPU check into ->task_new_fair(), this way we
can call place_entity() and get child ->vruntime right at
initial wakeup time.
(without this there can be large latencies)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 5 | ||||
| -rw-r--r-- | kernel/sched_fair.c | 3 |
2 files changed, 3 insertions, 5 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index f2b8db4..b41ef66 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1660,17 +1660,14 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags) { unsigned long flags; struct rq *rq; - int this_cpu; rq = task_rq_lock(p, &flags); BUG_ON(p->state != TASK_RUNNING); - this_cpu = smp_processor_id(); /* parent's CPU */ update_rq_clock(rq); p->prio = effective_prio(p); - if (task_cpu(p) != this_cpu || !p->sched_class->task_new || - !current->se.on_rq) { + if (!p->sched_class->task_new || !current->se.on_rq || !rq->cfs.curr) { activate_task(rq, p, 0); } else { /* diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index a9dfb77..f5f49176 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1007,13 +1007,14 @@ static void task_new_fair(struct rq *rq, struct task_struct *p) { struct cfs_rq *cfs_rq = task_cfs_rq(p); struct sched_entity *se = &p->se, *curr = cfs_rq->curr; + int this_cpu = smp_processor_id(); sched_info_queued(p); update_curr(cfs_rq); place_entity(cfs_rq, se, 1); - if (sysctl_sched_child_runs_first && + if (sysctl_sched_child_runs_first && this_cpu == task_cpu(p) && curr->vruntime < se->vruntime) { /* * Upon rescheduling, sched_class::put_prev_task() will place |
