From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752715AbaIJOOO (ORCPT ); Wed, 10 Sep 2014 10:14:14 -0400 Received: from mga14.intel.com ([192.55.52.115]:58890 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752258AbaIJOKd (ORCPT ); Wed, 10 Sep 2014 10:10:33 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,499,1406617200"; d="scan'208";a="589215265" From: kan.liang@intel.com To: a.p.zijlstra@chello.nl, eranian@google.com Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, paulus@samba.org, acme@kernel.org, ak@linux.intel.com, kan.liang@intel.com, "Yan, Zheng" Subject: [PATCH V5 06/16] perf, core: always switch pmu specific data during context switch Date: Wed, 10 Sep 2014 10:09:03 -0400 Message-Id: <1410358153-421-7-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1410358153-421-1-git-send-email-kan.liang@intel.com> References: <1410358153-421-1-git-send-email-kan.liang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kan Liang 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 --- kernel/events/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 3a1458c..5f49df2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2412,6 +2412,9 @@ 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