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perf: De-schedule a task context when removing the last event

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Since perf_install_in_context() will now install a context when we
add the first event, we can de-schedule the context when the last
event is removed.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110409192142.090431763@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2011-04-09 21:17:48 +02:00
committed by Ingo Molnar
parent e03a9a55b4
commit 64ce312618
1 changed files with 4 additions and 0 deletions
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4
kernel/events/core.c
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@@ -1120,6 +1120,10 @@ static int __perf_remove_from_context(void *info)
raw_spin_lock(&ctx->lock); raw_spin_lock(&ctx->lock);
event_sched_out(event, cpuctx, ctx); event_sched_out(event, cpuctx, ctx);
list_del_event(event, ctx); list_del_event(event, ctx);
if (!ctx->nr_events && cpuctx->task_ctx == ctx) {
ctx->is_active = 0;
cpuctx->task_ctx = NULL;
}
raw_spin_unlock(&ctx->lock); raw_spin_unlock(&ctx->lock);
return 0; return 0;