From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933646Ab2GLKOg (ORCPT ); Thu, 12 Jul 2012 06:14:36 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:34371 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933271Ab2GLKOf (ORCPT ); Thu, 12 Jul 2012 06:14:35 -0400 From: Andrew Vagin To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Andrew Vagin , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Steven Rostedt , Arun Sharma Subject: [PATCH] sched: deliver sched_switch events to a current task Date: Thu, 12 Jul 2012 14:14:29 +0400 Message-Id: <1342088069-1005148-1-git-send-email-avagin@openvz.org> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Otherwise they can't be filtered for a defined task. perf record -e sched:sched_switch ./foo This command doesn't report any event without this patch. I think it isn't a big problem for security, if someone will know who will be executed next. By default perf is disabled for non-root users. I need this events for profiling sleep times. sched_switch is used for getting callchains and sched_stat_* is used for getting time periods. This events are combined in user space, then it can be analized by perf tools. Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Steven Rostedt Cc: Arun Sharma Signed-off-by: Andrew Vagin --- kernel/sched/core.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d5594a4..c5d6a0f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1910,12 +1910,12 @@ static inline void prepare_task_switch(struct rq *rq, struct task_struct *prev, struct task_struct *next) { + trace_sched_switch(prev, next); sched_info_switch(prev, next); perf_event_task_sched_out(prev, next); fire_sched_out_preempt_notifiers(prev, next); prepare_lock_switch(rq, next); prepare_arch_switch(next); - trace_sched_switch(prev, next); } /** -- 1.7.1