Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751470AbZAZPBk (ORCPT ); Mon, 26 Jan 2009 10:01:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751455AbZAZPBb (ORCPT ); Mon, 26 Jan 2009 10:01:31 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:60881 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751431AbZAZPBa (ORCPT ); Mon, 26 Jan 2009 10:01:30 -0500 Date: Mon, 26 Jan 2009 16:00:02 +0100 From: Ingo Molnar To: Peter Zijlstra Cc: Kevin Shanahan , Avi Kivity , Steven Rostedt , "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Mike Galbraith , =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , bugme-daemon@bugzilla.kernel.org Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Message-ID: <20090126150002.GB9128@elte.hu> References: <1232455343.4895.4.camel@kulgan.wumi.org.au> <20090120125652.GA1457@elte.hu> <20090120130714.GA11048@elte.hu> <49760E2D.2060109@redhat.com> <1232547932.4895.119.camel@kulgan.wumi.org.au> <49773275.3020203@redhat.com> <20090121151820.GA23813@elte.hu> <1232963730.4921.12.camel@kulgan.wumi.org.au> <1232969705.4863.46.camel@laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1232969705.4863.46.camel@laptop> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 990 Lines: 32 * Peter Zijlstra wrote: > Is there a way to add a wall-time column to this output so that we can > see where the time goes? yes, on tip/master: http://people.redhat.com/mingo/tip.git/README do something like this: echo funcgraph-abstime > /debug/tracing/trace_options when the function-graph plugin is active. This will activate the absolute timestamps column in the trace output. > Another something nice would be to have ctx switches like: > > foo-1 => bar-2 ran: ${time foo spend on the cpu} since: ${time bar spend away from the cpu} > > I'll poke me a little at this function graph tracer thingy to see if I > can do that. indeed, tracking the 'scheduling atom duration' would be very nice. Ingo -- 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/