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Date: Sun, 19 Oct 2014 17:55:01 -0400 From: Kan Liang <kan.liang@...el.com> To: a.p.zijlstra@...llo.nl, eranian@...gle.com Cc: linux-kernel@...r.kernel.org, mingo@...hat.com, paulus@...ba.org, acme@...nel.org, jolsa@...hat.com, ak@...ux.intel.com, Kan Liang <kan.liang@...el.com>, "Yan, Zheng" <zheng.z.yan@...el.com> 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 <zheng.z.yan@...el.com> Signed-off-by: Kan Liang <kan.liang@...el.com> --- 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); -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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