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| author | Gleb Natapov <gleb@redhat.com> | 2011-10-23 19:10:33 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-11-14 13:01:21 +0100 |
| commit | 1d5f003f5a964711853514b04ddc872eec0fdc7b (patch) | |
| tree | 6f3e912a02b50dc698f601c3a08453a781e7f754 /kernel/events | |
| parent | 57d1c0c03c6b48b2b96870d831b9ce6b917f53ac (diff) | |
| download | linux-3.10-1d5f003f5a964711853514b04ddc872eec0fdc7b.tar.gz linux-3.10-1d5f003f5a964711853514b04ddc872eec0fdc7b.tar.bz2 linux-3.10-1d5f003f5a964711853514b04ddc872eec0fdc7b.zip | |
perf: Do not set task_ctx pointer in cpuctx if there are no events in the context
Do not set task_ctx pointer during sched_in if there are no
events associated with the context. Otherwise if during task
execution total number of events in the system will become zero
perf_event_context_sched_out() will not be called and cpuctx->task_ctx
will be left with a stale value.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20111023171033.GI17571@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 0e8457da6f9..b0c1186fd97 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2173,7 +2173,8 @@ static void perf_event_context_sched_in(struct perf_event_context *ctx, perf_event_sched_in(cpuctx, ctx, task); - cpuctx->task_ctx = ctx; + if (ctx->nr_events) + cpuctx->task_ctx = ctx; perf_pmu_enable(ctx->pmu); perf_ctx_unlock(cpuctx, ctx); |