Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752957Ab0GNI5r (ORCPT ); Wed, 14 Jul 2010 04:57:47 -0400 Received: from mail-bw0-f46.google.com ([209.85.214.46]:49419 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752264Ab0GNI5q (ORCPT ); Wed, 14 Jul 2010 04:57:46 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=RStEJhnYKlJKs2iGeAK70yPlRz1c8bNpB4toF9+JaaeHjWU6Xlwv8TIbv1pFy2tcFZ hODSwDYEsq9XtgP4KHgIuom1Pa7GEtwl1Y0C1J5o349tThncoj/i+8se1i0d6Q2l/nYb ZIN4xX0FnAzcVY833l7AmVmHQ0ICTVhFZwCF4= MIME-Version: 1.0 In-Reply-To: References: <20100714083112.GA4627@brouette> <4C3D777F.8090702@cs.helsinki.fi> Date: Wed, 14 Jul 2010 11:57:42 +0300 X-Google-Sender-Auth: 8tRMgzMS49wDDbnfAHAIeM6qfWI Message-ID: Subject: Re: kmemleak, cpu usage jump out of nowhere From: Pekka Enberg To: Zeno Davatz Cc: Mike Galbraith , Damien Wyart , linux-kernel@vger.kernel.org, Catalin Marinas , Andrew Morton , mingo@elte.hu, a.p.zijlstra@chello.nl Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2382 Lines: 56 On Wed, Jul 14, 2010 at 11:54 AM, Zeno Davatz wrote: > On Wed, Jul 14, 2010 at 10:38 AM, Pekka Enberg wrote: >> 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. > > Once it is gdm, once it is firefox-bin once it is htop. Its really od. > Nothing crashes one of those just uses lots of CPU. The machine just > gets really slow and then calms down again and everything is back to > normal. That's the part that makes me think it's scheduler and/or cpufreq related. > ;) > > Maybe a bad temper? Yeah, maybe Tux is having a bad day. :-) -- 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/