From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755210AbXGIOJp (ORCPT ); Mon, 9 Jul 2007 10:09:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752635AbXGIOJj (ORCPT ); Mon, 9 Jul 2007 10:09:39 -0400 Received: from andromeda.dapyr.net ([69.45.6.100]:60039 "EHLO andromeda.dapyr.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752519AbXGIOJi (ORCPT ); Mon, 9 Jul 2007 10:09:38 -0400 X-Greylist: delayed 416 seconds by postgrey-1.27 at vger.kernel.org; Mon, 09 Jul 2007 10:09:38 EDT Date: Mon, 9 Jul 2007 10:02:42 -0400 From: Konrad Rzeszutek To: linux-kernel@vger.kernel.org Subject: [PATCH] Inhibit NMI watchdog when Alt-SysRq-T operation is underway. Message-ID: <20070709140242.GA18098@andromeda.dapyr.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On large memory configuration with not so fast CPUs the NMI watchdog is triggered when memory addresses are being gathered and printed. The code paths for Alt-SysRq-t are sprinkled with touch_nmi_watchdog in various places but not in this routine (or in the loop that utilizes this function). The patch has been tested for regression on large CPU+memory configuration (128 logical CPUs + 224 GB) and 1,2,4,16-CPU sockets with various memory sizes (1,2,4,6,20).