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| author | Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> | 2007-10-17 16:55:11 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-17 16:55:11 +0200 |
| commit | b9dca1e0fcb696716840a3bc8f20a6941b484dbf (patch) | |
| tree | 1fb2198b192b35382756e288ba33df6f37fcf6d4 /kernel | |
| parent | b1a8c172c318534b96d0f0f1aecdad3898118b98 (diff) | |
| download | linux-b9dca1e0fcb696716840a3bc8f20a6941b484dbf.tar.gz linux-b9dca1e0fcb696716840a3bc8f20a6941b484dbf.tar.bz2 linux-b9dca1e0fcb696716840a3bc8f20a6941b484dbf.zip | |
sched: fix new task startup crash
Child task may be added on a different cpu that the one on which parent
is running. In which case, task_new_fair() should check whether the new
born task's parent entity should be added as well on the cfs_rq.
Patch below fixes the problem in task_new_fair.
This could fix the put_prev_task_fair() crashes reported.
Reported-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reported-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 2 | ||||
| -rw-r--r-- | kernel/sched_fair.c | 6 |
2 files changed, 2 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 975436435b42..0ec9521a8e70 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1712,7 +1712,7 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags) p->prio = effective_prio(p); - if (!p->sched_class->task_new || !current->se.on_rq || !rq->cfs.curr) { + if (!p->sched_class->task_new || !current->se.on_rq) { activate_task(rq, p, 0); } else { /* diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index a17b785d7000..166ed6db600b 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1031,12 +1031,8 @@ static void task_new_fair(struct rq *rq, struct task_struct *p) swap(curr->vruntime, se->vruntime); } - update_stats_enqueue(cfs_rq, se); - check_spread(cfs_rq, se); - check_spread(cfs_rq, curr); - __enqueue_entity(cfs_rq, se); - account_entity_enqueue(cfs_rq, se); se->peer_preempt = 0; + enqueue_task_fair(rq, p, 0); resched_task(rq->curr); } |