[PATCH 07/15] perf, core: Always swtich pmu specific data during context switch

[Yan, Zheng]

From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>

Swtich pmu specific data even if switching perf task conext is
optimized out.

Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
 kernel/events/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 6499dae..974f7c7 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2318,6 +2318,8 @@ 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;
+			ctx->task_ctx_data = xchg(&next_ctx->task_ctx_data,
+						  ctx->task_ctx_data);
 			do_switch = 0;
 
 			perf_event_sync_stat(ctx, next_ctx);
-- 
1.8.1.4

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