Messages in this thread Patch in this message | | | Date | Sun, 23 Oct 2011 19:10:33 +0200 | From | Gleb Natapov <> | Subject | [PATCH] perf: do not set task_ctx pointer in cpuctx if there is no events in the context |
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Do not set task_ctx pointer during sched_in if there is 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> diff --git a/kernel/events/core.c b/kernel/events/core.c index 0f85778..68b13ee 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2172,7 +2172,8 @@ 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); -- Gleb.
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