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>
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@ -2173,7 +2173,8 @@ static void perf_event_context_sched_in(struct perf_event_context *ctx,
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perf_event_sched_in(cpuctx, ctx, task);
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cpuctx->task_ctx = ctx;
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if (ctx->nr_events)
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cpuctx->task_ctx = ctx;
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perf_pmu_enable(ctx->pmu);
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perf_ctx_unlock(cpuctx, ctx);
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