From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755988AbXLBOQ4 (ORCPT ); Sun, 2 Dec 2007 09:16:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752628AbXLBOQt (ORCPT ); Sun, 2 Dec 2007 09:16:49 -0500 Received: from lazybastard.de ([212.112.238.170]:54954 "EHLO longford.lazybastard.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751048AbXLBOQs convert rfc822-to-8bit (ORCPT ); Sun, 2 Dec 2007 09:16:48 -0500 Date: Sun, 2 Dec 2007 15:11:18 +0100 From: =?utf-8?B?SsO2cm4=?= Engel To: Ingo Molnar Cc: =?utf-8?B?SsO2cm4=?= Engel , Mark Lord , Pavel Machek , Mark Lord , Thomas Gleixner , len.brown@intel.com, Andrew Morton , linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org, rjw@sisk.pl Subject: Re: [BUG] Strange 1-second pauses during Resume-from-RAM Message-ID: <20071202141117.GB9516@lazybastard.org> References: <20071130183510.GA1570@lazybastard.org> <20071130184625.GB9928@elte.hu> <20071201151650.GA5031@lazybastard.org> <20071201183256.GA14052@elte.hu> <20071201204747.GA6458@lazybastard.org> <20071201205456.GA8231@elte.hu> <20071201234112.GA7209@lazybastard.org> <20071202085607.GA28966@elte.hu> <20071202113143.GA9378@lazybastard.org> <20071202135711.GA20434@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <20071202135711.GA20434@elte.hu> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2 December 2007 14:57:11 +0100, Ingo Molnar wrote: > > hm, do you have CONFIG_FRAME_POINTERS=y, i.e. are the dumps reliable? I do. Went through 10odd runs and annotated the function right below mcount each time. Seems to work now. Trouble is that it doesn't solve my real problem at hand. Something is causing significant delays when writing to logfs. Core logfs code is not running, but may cause whatever other code is running and burning up all the cpu time. Wasting 100ms of "qemu-time" to write a single page happens fairly frequently. With the latency tracer the problem appears to have become worse. Now the loftlockup code triggers quite frequently. Which makes a bit of sense, as the problem is a busy CPU, rather than an idle one. Guess I'll try oprofile or lcov instead. Jörn -- Joern's library part 5: http://www.faqs.org/faqs/compression-faq/part2/section-9.html