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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-04-05 17:23:55 +0200
committerIngo Molnar <mingo@elte.hu>2011-04-14 08:52:40 +0200
commitb84cb5df1f9ad6da3f214c638d5fb08d0c99de1f (patch)
treecd7053563e72bdf6b5b5cb8ca6a6d646c914680a /kernel/sched.c
parente4a52bcb9a18142d79e231b6733cabdbf2e67c1f (diff)
sched: Remove rq argument from ttwu_stat()
In order to call ttwu_stat() without holding rq->lock we must remove its rq argument. Since we need to change rq stats, account to the local rq instead of the task rq, this is safe since we have IRQs disabled. Reviewed-by: Frank Rowand <frank.rowand@am.sony.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110405152729.394638826@chello.nl
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 871dd9e147a6..5ec2e8b4b01a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2410,9 +2410,11 @@ static void update_avg(u64 *avg, u64 sample)
#endif
static void
-ttwu_stat(struct rq *rq, struct task_struct *p, int cpu, int wake_flags)
+ttwu_stat(struct task_struct *p, int cpu, int wake_flags)
{
#ifdef CONFIG_SCHEDSTATS
+ struct rq *rq = this_rq();
+
#ifdef CONFIG_SMP
int this_cpu = smp_processor_id();
@@ -2561,9 +2563,10 @@ out_activate:
ttwu_activate(rq, p, ENQUEUE_WAKEUP | ENQUEUE_WAKING);
out_running:
ttwu_post_activation(p, rq, wake_flags);
- ttwu_stat(rq, p, cpu, wake_flags);
success = 1;
__task_rq_unlock(rq);
+
+ ttwu_stat(p, cpu, wake_flags);
out:
raw_spin_unlock_irqrestore(&p->pi_lock, flags);
put_cpu();
@@ -2600,7 +2603,7 @@ static void try_to_wake_up_local(struct task_struct *p)
ttwu_activate(rq, p, ENQUEUE_WAKEUP);
ttwu_post_activation(p, rq, 0);
- ttwu_stat(rq, p, smp_processor_id(), 0);
+ ttwu_stat(p, smp_processor_id(), 0);
out:
raw_spin_unlock(&p->pi_lock);
}