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    Subject[tip:perf/core] perf: De-schedule a task context when removing the last event
    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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