Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752668Ab0GNIeo (ORCPT ); Wed, 14 Jul 2010 04:34:44 -0400 Received: from mail-fx0-f46.google.com ([209.85.161.46]:52264 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752190Ab0GNIen (ORCPT ); Wed, 14 Jul 2010 04:34:43 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=JxcXPm7IAdXsSA7tS9W/A6q6OfrNnJmyeIgZ76FFPrM8GDS/9wHyQJKsZdTRxAQM3e LHmfolncklR45fyxTCq3j4NdkAe2ktXfcWYwA4WqZGKt9z1yrrnLHnWZ8cOpl3G9IA4n NxsPyquyzJtgrAaSmlDdmHq+NwIzV9n3zDIH8= MIME-Version: 1.0 In-Reply-To: <20100714083112.GA4627@brouette> References: <20100714083112.GA4627@brouette> Date: Wed, 14 Jul 2010 10:34:41 +0200 Message-ID: Subject: Re: kmemleak, cpu usage jump out of nowhere From: Zeno Davatz To: Damien Wyart Cc: Pekka Enberg , linux-kernel@vger.kernel.org, Catalin Marinas , Andrew Morton 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: 1686 Lines: 40 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. Best Zeno -- 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/