From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755968Ab3EQNHJ (ORCPT ); Fri, 17 May 2013 09:07:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:10942 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754991Ab3EQNHH (ORCPT ); Fri, 17 May 2013 09:07:07 -0400 Date: Fri, 17 May 2013 09:07:00 -0400 From: Don Zickus To: Li Zefan Cc: Ingo Molnar , LKML Subject: Re: [PATCH 2/3] watchdog: Document watchdog_thresh sysctl Message-ID: <20130517130700.GG78758@redhat.com> References: <51959668.9040106@huawei.com> <51959678.6000802@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <51959678.6000802@huawei.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 17, 2013 at 10:31:20AM +0800, Li Zefan wrote: > > Signed-off-by: Li Zefan Acked-by: Don Zickus > --- > Documentation/sysctl/kernel.txt | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt > index ccd4258..e8fabd6 100644 > --- a/Documentation/sysctl/kernel.txt > +++ b/Documentation/sysctl/kernel.txt > @@ -76,6 +76,7 @@ show up in /proc/sys/kernel: > - tainted > - threads-max > - unknown_nmi_panic > +- watchdog_thresh > - version > > ============================================================== > @@ -648,3 +649,16 @@ that time, kernel debugging information is displayed on console. > > NMI switch that most IA32 servers have fires unknown NMI up, for > example. If a system hangs up, try pressing the NMI switch. > + > +============================================================== > + > +watchdog_thresh: > + > +This value can be used to control the frequency of hrtimer and NMI > +events and the soft and hard lockup thresholds. The default threshold > +is 10 seconds. > + > +The softlockup threshold is (2 * watchdog_thresh). Setting this > +tunable to zero will disable lockup detection altogether. > + > +============================================================== > -- > 1.8.0.2