Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757623Ab3FTKa5 (ORCPT ); Thu, 20 Jun 2013 06:30:57 -0400 Received: from mx1.redhat.com ([209.132.183.28]:31665 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755163Ab3FTKa4 (ORCPT ); Thu, 20 Jun 2013 06:30:56 -0400 Date: Thu, 20 Jun 2013 18:30:48 +0800 From: Dong Zhu To: John Stultz , Thomas Gleixner Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] timer stats: reset entries when disable the timer usage statistics Message-ID: <20130620103048.GP8399@zhudong.nay.redhat.com> References: <20130610075745.GK8399@zhudong.nay.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130610075745.GK8399@zhudong.nay.redhat.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1581 Lines: 46 On Mon, Jun 10, 2013 at 03:57:45PM +0800, Dong Zhu wrote: > From 4dbb760213856dc382241db456c1c6487694837c Mon Sep 17 00:00:00 2001 > From: Dong Zhu > Date: Mon, 10 Jun 2013 15:09:27 +0800 > > we can start/stop data collection by using : > echo [1|0] > /proc/timer_stats > when we stop the data collection,hrtimer will not update the statistics > for a timer any more,but we could still check the timer usage > statistics,unfortunately the data is not the latest, the inaccurate data > might make us confusing. So the purpose of this patch is to reset the > entries once disable operation is executed.In this way we will never > see the inaccurate timer usage statistics. > > Signed-off-by: Dong Zhu > --- > kernel/time/timer_stats.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c > index 0b537f2..43f05e7 100644 > --- a/kernel/time/timer_stats.c > +++ b/kernel/time/timer_stats.c > @@ -371,6 +371,7 @@ static ssize_t tstats_write(struct file *file, const char __user *buf, > switch (ctl[0]) { > case '0': > if (timer_stats_active) { > + reset_entries(); > timer_stats_active = 0; > time_stop = ktime_get(); > sync_access(); > -- > 1.7.11.7 Hi all, Any comments here ? -- Best Regards, Dong Zhu -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/