From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266352AbUHBI0o (ORCPT ); Mon, 2 Aug 2004 04:26:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266358AbUHBI0o (ORCPT ); Mon, 2 Aug 2004 04:26:44 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:35273 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S266352AbUHBI0n (ORCPT ); Mon, 2 Aug 2004 04:26:43 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8-rc2-M5 From: Lee Revell To: Ingo Molnar Cc: linux-kernel In-Reply-To: <20040802073938.GA8332@elte.hu> References: <20040726124059.GA14005@elte.hu> <20040726204720.GA26561@elte.hu> <20040729222657.GA10449@elte.hu> <1091141622.30033.3.camel@mindpipe> <20040730064431.GA17777@elte.hu> <1091228074.805.6.camel@mindpipe> <1091234100.1677.41.camel@mindpipe> <1091403477.862.4.camel@mindpipe> <1091407585.862.40.camel@mindpipe> <20040802073938.GA8332@elte.hu> Content-Type: text/plain Message-Id: <1091435237.3024.9.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Mon, 02 Aug 2004 04:27:18 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2004-08-02 at 03:39, Ingo Molnar wrote: > * Lee Revell wrote: > > > If we have any suspects for the code paths involved, couldn't this be > > verified by adding a udelay(10) to the path, and verifying that the > > hump moves by 10? This technique could also be used to distinguish > > different code paths with similar execution times. It looks like they > > are finite and few in number. > > i believe wli's latency-timing patch gives a pretty good indication of > the code path(s) involved - i'm using something quite similar to that. > The printout triggers immediately at the end of a high latency, so the > stack contains a number of clues about what went on before. > Can you post this patch, or add it to the voluntary preempt series? The one posted several weeks ago worked for me but had to be applied manually and has probably been improved since. Just to clarify the last numbers I posted were for O2. Lee