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perf: Do not set task_ctx pointer in cpuctx if there are no events in the context

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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 <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Gleb Natapov 2011-10-23 19:10:33 +02:00 • committed by Ingo Molnar
commit 1d5f003f5a
1 changed files with 2 additions and 1 deletions
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3
kernel/events/core.c
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@ -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);