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Message-Id: <1388728091-18564-7-git-send-email-zheng.z.yan@intel.com> Date: Fri, 3 Jan 2014 13:48:03 +0800 From: "Yan, Zheng" <zheng.z.yan@...el.com> To: linux-kernel@...r.kernel.org Cc: a.p.zijlstra@...llo.nl, mingo@...nel.org, acme@...radead.org, eranian@...gle.com, andi@...stfloor.org, "Yan, Zheng" <zheng.z.yan@...el.com> Subject: [PATCH 06/14] 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 optimizes context switch oout in this case. Previous patch inroduces pmu specific data. The data is task specific, so we should switch the data even when context switch is optimized out. Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com> --- kernel/events/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index b6650ab..d6d8dea 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2319,6 +2319,8 @@ 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); -- 1.8.4.2 -- 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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