From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265232AbUGMOkh (ORCPT ); Tue, 13 Jul 2004 10:40:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265268AbUGMOkh (ORCPT ); Tue, 13 Jul 2004 10:40:37 -0400 Received: from holomorphy.com ([207.189.100.168]:44949 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S265232AbUGMOkb (ORCPT ); Tue, 13 Jul 2004 10:40:31 -0400 Date: Tue, 13 Jul 2004 07:40:28 -0700 From: William Lee Irwin III To: Joe Korty Cc: linux-kernel@vger.kernel.org Subject: Re: preempt-timing-2.6.8-rc1 Message-ID: <20040713144028.GH21066@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Joe Korty , linux-kernel@vger.kernel.org References: <20040713122805.GZ21066@holomorphy.com> <20040713143600.GA22758@tsunami.ccur.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040713143600.GA22758@tsunami.ccur.com> User-Agent: Mutt/1.5.5.1+cvs20040105i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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? -- wli