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SubjectRe: [PATCH V4 03/16] perf, x86: use context switch callback to flush LBR stack
On Mon, Jun 30, 2014 at 04:50:40PM +0800, Yan, Zheng wrote:
> @@ -185,6 +185,23 @@ void intel_pmu_lbr_enable(struct perf_event *event)
> return;
>
> /*
> + * It is necessary to flush the stack on context switch. This happens
> + * when the branch stack does not tag its entries with the pid of the
> + * current task.

Did you mean to say: "This happens _because_ the branch stack does not
tag its entries with the pid of the current task." ?

> + */
> + if (sched_in) {
> + intel_pmu_lbr_reset();
> + cpuc->lbr_context = ctx;
> + }
> +}
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