From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752719Ab3EQCbh (ORCPT ); Thu, 16 May 2013 22:31:37 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:62599 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751680Ab3EQCbf (ORCPT ); Thu, 16 May 2013 22:31:35 -0400 Message-ID: <51959678.6000802@huawei.com> Date: Fri, 17 May 2013 10:31:20 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130509 Thunderbird/17.0.6 MIME-Version: 1.0 To: Ingo Molnar CC: Don Zickus , LKML Subject: [PATCH 2/3] watchdog: Document watchdog_thresh sysctl References: <51959668.9040106@huawei.com> In-Reply-To: <51959668.9040106@huawei.com> Content-Type: text/plain; charset="GB2312" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.135.68.215] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Li Zefan --- 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