Messages in this thread Patch in this message | | | Date | Sat, 28 May 2011 16:42:15 GMT | From | tip-bot for Peter Zijlstra <> | Subject | [tip:perf/core] perf: De-schedule a task context when removing the last event |
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Commit-ID: 64ce312618ef0e11d88def80effcefd1b59fdb1e Gitweb: http://git.kernel.org/tip/64ce312618ef0e11d88def80effcefd1b59fdb1e Author: Peter Zijlstra <a.p.zijlstra@chello.nl> AuthorDate: Sat, 9 Apr 2011 21:17:48 +0200 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Sat, 28 May 2011 18:01:23 +0200
perf: De-schedule a task context when removing the last event
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> --- kernel/events/core.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index c378062..cc5d57d 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1120,6 +1120,10 @@ static int __perf_remove_from_context(void *info) raw_spin_lock(&ctx->lock); event_sched_out(event, cpuctx, 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); return 0;
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