From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265305AbUGMPI1 (ORCPT ); Tue, 13 Jul 2004 11:08:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265317AbUGMPI1 (ORCPT ); Tue, 13 Jul 2004 11:08:27 -0400 Received: from mail.ccur.com ([208.248.32.212]:52234 "EHLO exchange.ccur.com") by vger.kernel.org with ESMTP id S265305AbUGMPIK (ORCPT ); Tue, 13 Jul 2004 11:08:10 -0400 Date: Tue, 13 Jul 2004 11:08:08 -0400 From: Joe Korty To: William Lee Irwin III , linux-kernel@vger.kernel.org Subject: Re: preempt-timing-2.6.8-rc1 Message-ID: <20040713150808.GA23127@tsunami.ccur.com> Reply-To: joe.korty@ccur.com References: <20040713122805.GZ21066@holomorphy.com> <20040713143600.GA22758@tsunami.ccur.com> <20040713144028.GH21066@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040713144028.GH21066@holomorphy.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 13, 2004 at 07:40:28AM -0700, William Lee Irwin III wrote: > On Tue, Jul 13, 2004 at 05:28:05AM -0700, William Lee Irwin III wrote: > >> This patch uses the preemption counter increments and decrements to time > >> non-preemptible critical sections. > >> This is an instrumentation patch intended to help determine the causes of > >> scheduling latency related to long non-preemptible critical sections. > >> Changes from 2.6.7-based patch: > >> (1) fix unmap_vmas() check correctly this time > >> (2) add touch_preempt_timing() to cond_resched_lock() > >> (3) depend on preempt until it's worked out wtf goes wrong without it > > On Tue, Jul 13, 2004 at 10:36:00AM -0400, Joe Korty wrote: > > You preemption-block hold times will improve *enormously* if you move all > > softirq processing down to the daemon (and possibly raise the daemon to > > one of the higher SCHED_RR priorities, to compensate for softirq processing > > no longer happening at interrupt level). > > Plausible. Got a patch? I can scrape one up. It'll be a day or so. Joe