From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760808AbXGPJmR (ORCPT ); Mon, 16 Jul 2007 05:42:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756014AbXGPJmE (ORCPT ); Mon, 16 Jul 2007 05:42:04 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:50106 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755046AbXGPJmB (ORCPT ); Mon, 16 Jul 2007 05:42:01 -0400 Date: Mon, 16 Jul 2007 11:41:58 +0200 From: Ingo Molnar To: Markus Cc: Linux Kernel Mailing List Subject: Re: [patch] CFS scheduler, -v19 Message-ID: <20070716094158.GA19491@elte.hu> References: <20070706173319.GA2356@elte.hu> <200707141334.45628.lists4me@web.de> <200707141711.25272.lists4me@web.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200707141711.25272.lists4me@web.de> User-Agent: Mutt/1.5.14 (2007-02-12) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.0.3 -1.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Markus wrote: > [...] The mouse is smooth, just when one app is being quit (dont know > why...) the mouse will be jerking for a few seconds... is the mouse jerky on any app quitting? Or is your observation the following: _sometimes_ apps quit unexpectedly (their window just vanishes?), and _at the same time_, the mouse becomes jerky as well, for a few seconds? the mouse typically only becomes jerky when there's some really high load on the system - anything else would be a kernel bug. A jerky mouse on an unloaded system is definitely a sign of some sort of kernel bug (in or outside of the scheduler). An app vanishing unexpectedly might mean an OOM-kill - but that would should up in the syslog as well. Pretty weird. Can you make this regression trigger arbitrarily, so that we could debug it better? Apps exiting unexpectedly can be debugged via: http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc6/2.6.22-rc6-mm1/broken-out/vdso-print-fatal-signals.patch you can turn it on via the print-fatal-signals=1 boot option or via: echo 1 > /proc/sys/kernel/print-fatal-signals this feature will produce a small dump to the syslog about every app that exits unexpectedly. Note that this might not cover all types of "window suddenly vanishes" regressions. Ingo