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Merge branch 'sched/urgent' into sched/core

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Merge reason: Merge dependent fix, update to latest -rc.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2010-02-08 08:55:43 +01:00
parent 2357725695 50200df462
commit 6d3e0907b8
1629 changed files with 41043 additions and 16909 deletions
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kernel/sched.c
+31 -13
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@@ -2286,14 +2286,12 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
}
/*
* Called from:
* Gets called from 3 sites (exec, fork, wakeup), since it is called without
* holding rq->lock we need to ensure ->cpus_allowed is stable, this is done
* by:
*
* - fork, @p is stable because it isn't on the tasklist yet
*
* - exec, @p is unstable, retry loop
*
* - wake-up, we serialize ->cpus_allowed against TASK_WAKING so
* we should be good.
* exec: is unstable, retry loop
* fork & wake-up: serialize ->cpus_allowed against TASK_WAKING
*/
static inline
int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)
@@ -2586,9 +2584,6 @@ void sched_fork(struct task_struct *p, int clone_flags)
if (p->sched_class->task_fork)
p->sched_class->task_fork(p);
#ifdef CONFIG_SMP
cpu = select_task_rq(p, SD_BALANCE_FORK, 0);
#endif
set_task_cpu(p, cpu);
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
@@ -2618,6 +2613,21 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
{
unsigned long flags;
struct rq *rq;
int cpu __maybe_unused = get_cpu();
#ifdef CONFIG_SMP
/*
* Fork balancing, do it here and not earlier because:
* - cpus_allowed can change in the fork path
* - any previously selected cpu might disappear through hotplug
*
* We still have TASK_WAKING but PF_STARTING is gone now, meaning
* ->cpus_allowed is stable, we have preemption disabled, meaning
* cpu_online_mask is stable.
*/
cpu = select_task_rq(p, SD_BALANCE_FORK, 0);
set_task_cpu(p, cpu);
#endif
rq = task_rq_lock(p, &flags);
BUG_ON(p->state != TASK_WAKING);
@@ -2631,6 +2641,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
p->sched_class->task_woken(rq, p);
#endif
task_rq_unlock(rq, &flags);
put_cpu();
}
#ifdef CONFIG_PREEMPT_NOTIFIERS
@@ -3687,8 +3698,11 @@ need_resched_nonpreemptible:
post_schedule(rq);
if (unlikely(reacquire_kernel_lock(current) < 0))
if (unlikely(reacquire_kernel_lock(current) < 0)) {
prev = rq->curr;
switch_count = &prev->nivcsw;
goto need_resched_nonpreemptible;
}
preempt_enable_no_resched();
if (need_resched())
@@ -5293,14 +5307,18 @@ int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
* the ->cpus_allowed mask from under waking tasks, which would be
* possible when we change rq->lock in ttwu(), so synchronize against
* TASK_WAKING to avoid that.
*
* Make an exception for freshly cloned tasks, since cpuset namespaces
* might move the task about, we have to validate the target in
* wake_up_new_task() anyway since the cpu might have gone away.
*/
again:
while (p->state == TASK_WAKING)
while (p->state == TASK_WAKING && !(p->flags & PF_STARTING))
cpu_relax();
rq = task_rq_lock(p, &flags);
if (p->state == TASK_WAKING) {
if (p->state == TASK_WAKING && !(p->flags & PF_STARTING)) {
task_rq_unlock(rq, &flags);
goto again;
}