Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751102AbWAEBOY (ORCPT ); Wed, 4 Jan 2006 20:14:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751108AbWAEBOY (ORCPT ); Wed, 4 Jan 2006 20:14:24 -0500 Received: from mx1.redhat.com ([66.187.233.31]:27275 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1751102AbWAEBOX (ORCPT ); Wed, 4 Jan 2006 20:14:23 -0500 Date: Wed, 4 Jan 2006 20:14:04 -0500 From: Dave Jones To: Con Kolivas Cc: ck@vds.kolivas.org, Radoslaw Szkodzinski , Arjan van de Ven , linux kernel mailing list Subject: Re: 2.6.15-ck1 Message-ID: <20060105011404.GB2658@redhat.com> Mail-Followup-To: Dave Jones , Con Kolivas , ck@vds.kolivas.org, Radoslaw Szkodzinski , Arjan van de Ven , linux kernel mailing list References: <200601041200.03593.kernel@kolivas.org> <200601051112.52404.kernel@kolivas.org> <20060105002759.GB30967@redhat.com> <200601051149.18335.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200601051149.18335.kernel@kolivas.org> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1934 Lines: 43 On Thu, Jan 05, 2006 at 11:49:17AM +1100, Con Kolivas wrote: > On Thursday 05 January 2006 11:27, Dave Jones wrote: > > On Thu, Jan 05, 2006 at 11:12:51AM +1100, Con Kolivas wrote: > > > On Thursday 05 January 2006 08:40, Radoslaw Szkodzinski wrote: > > > > Arjan van de Ven wrote: > > > > > On Wed, 2006-01-04 at 14:57 -0500, Dave Jones wrote: > > > > > > > > > > sounds like we need some sort of profiler or benchmarker or at least > > > > > a tool that helps finding out which timers are regularly firing, > > > > > with the aim at either grouping them or trying to reduce their > > > > > disturbance in some form. > > > > > > > > You mean something like a modification to timer debugging patch to > > > > record the last time the timer fired, right? > > > > Timertop could then detect the pattern and provide frequency, standard > > > > deviation and other statistical data. > > > > It would be much more expensive to test of course. > > > > > > I don't think the timer debugging patch needs to give out any more info. > > > The userspace tool should be able to do this with the amount of info the > > > timer debugging patch is giving already. > > > > In the absense of a pointer to a userspace tool, I found the following > > handy. (It also fixes a bug where it was printing garbage as process > > names). > > Timertop and pmstats are here: > http://ck.kolivas.org/patches/dyn-ticks/ me no likee. it's very pretty, but it feels awkward to drive. Even after I'd stopped it dancing long enough to read, its output format seemed odd. With the diff I did, I just piped it through sort -n -k2 | tail to see the interesting parts. Dave - 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/