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Date:	Sun, 19 Oct 2014 17:55:01 -0400
From:	Kan Liang <>
	Kan Liang <>,
	"Yan, Zheng" <>
Subject: [PATCH V6 06/17] perf, core: always switch pmu specific data during context switch

If two tasks were both forked from the same parent task, Events in
their perf task contexts can be the same. Perf core may leave out
switching the perf event contexts.

Previous patch inroduces pmu specific data. The data is for saving
the LBR stack, it is task specific. So we need to switch the data
even when context switch is optimized out.

Signed-off-by: Yan, Zheng <>
Signed-off-by: Kan Liang <>
 kernel/events/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index a7c0d5c..5b5f143 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2420,6 +2420,9 @@ static void perf_event_context_sched_out(struct task_struct *task, int ctxn,
 			next->perf_event_ctxp[ctxn] = ctx;
 			ctx->task = next;
 			next_ctx->task = task;
+			swap(ctx->task_ctx_data, next_ctx->task_ctx_data);
 			do_switch = 0;
 			perf_event_sync_stat(ctx, next_ctx);

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