Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752516Ab0GNIid (ORCPT ); Wed, 14 Jul 2010 04:38:33 -0400 Received: from courier.cs.helsinki.fi ([128.214.9.1]:56139 "EHLO mail.cs.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751427Ab0GNIib (ORCPT ); Wed, 14 Jul 2010 04:38:31 -0400 Message-ID: <4C3D777F.8090702@cs.helsinki.fi> Date: Wed, 14 Jul 2010 11:38:23 +0300 From: Pekka Enberg User-Agent: Thunderbird 2.0.0.24 (Macintosh/20100228) MIME-Version: 1.0 To: Zeno Davatz , Mike Galbraith CC: Damien Wyart , linux-kernel@vger.kernel.org, Catalin Marinas , Andrew Morton , mingo@elte.hu, a.p.zijlstra@chello.nl Subject: Re: kmemleak, cpu usage jump out of nowhere References: <20100714083112.GA4627@brouette> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1773 Lines: 37 Zeno Davatz wrote: > On Wed, Jul 14, 2010 at 10:31 AM, Damien Wyart wrote: > >>> On Wed, Jul 14, 2010 at 9:12 AM, Zeno Davatz wrote: >>>> I got a new Intel core-8 i7 processor. >>>> I am on kernel uname -a >>>> Linux zenogentoo 2.6.35-rc5 #97 SMP Tue Jul 13 16:13:25 CEST 2010 i686 >>>> Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz GenuineIntel GNU/Linux >>>> Sometimes in the middle of nowhere all of a sudden all of my 8-cores >>>> are at 100% CPU usage and my machine really lags and hangs and is not >>>> useable anymore. Some random process just grabs a bunch CPUs according >>>> to htop. >> * Pekka Enberg [2010-07-14 11:05]: >>> Why did you enable CONFIG_DEBUG_KMEMLEAK? Memory leak scanning is >>> likely the source of these pauses. >> I am seeing the same problem with a Core i7 920 and 2.6.35-rc5, and I do >> not have CONFIG_DEBUG_KMEMLEAK enabled, so I think this is not related. >> >> I do not see anything special in the logs, just the load becoming mad >> and almost preventing ssh access. I've been seeing that since the first >> 2.6.35 rc I tested (-rc2 or -rc3, I don't remember) and I did not have >> time to report it before but I was surprised nobody else did. No problem >> with 2.6.34 and 2.6.34.1. > > same with me. My last build I tested was 2.6.34-rc7. No problems > there. No CPU jumps out of nowhere. > > It is like any application all of a sudden use 400% CPU i.e. htop. Interesting. Lets CC some scheduler folks for help. Pekka -- 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/