From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1032661AbeCAPkQ (ORCPT ); Thu, 1 Mar 2018 10:40:16 -0500 Received: from mga14.intel.com ([192.55.52.115]:18846 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1032646AbeCAPkK (ORCPT ); Thu, 1 Mar 2018 10:40:10 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,408,1515484800"; d="scan'208";a="208109396" From: Alexey Budankov Subject: [RFC PATCH] perf/core: exposing type of context-switch-out event To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , Andi Kleen , linux-kernel , Dmitri Prokhorov Organization: Intel Corp. Message-ID: <06006a92-3745-0785-cb11-ddbf70e84ded@linux.intel.com> Date: Thu, 1 Mar 2018 18:40:04 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, This patch prototypes exposing the type of context-switch-out event using PERF_RECORD_MISC_EXT_RESERVED bit for PERF_RECORD_SWITCH[_CPU_WIDE] records. Types of context-switch-out events introduced by the patch meant to be a) preempted (task->state == TASK_RUNNING) or b) yielded == !preempted; The changes have been manually tested on Fedora 27 with the patched kernel: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core Signed-off-by: Alexey Budankov --- kernel/events/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 57898102847f..e3ca597f4e2b 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7216,6 +7216,8 @@ static void perf_event_switch(struct task_struct *task, struct task_struct *next_prev, bool sched_in) { struct perf_switch_event switch_event; + __u16 switch_type = sched_in ? 0 : PERF_RECORD_MISC_SWITCH_OUT | + (task->state == TASK_RUNNING ? 0 : PERF_RECORD_MISC_EXT_RESERVED); /* N.B. caller checks nr_switch_events != 0 */ @@ -7225,7 +7227,7 @@ static void perf_event_switch(struct task_struct *task, .event_id = { .header = { /* .type */ - .misc = sched_in ? 0 : PERF_RECORD_MISC_SWITCH_OUT, + .misc = switch_type, /* .size */ }, /* .next_prev_pid */