From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266127AbUHPFOa (ORCPT ); Mon, 16 Aug 2004 01:14:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267438AbUHPFOa (ORCPT ); Mon, 16 Aug 2004 01:14:30 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:13955 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S266127AbUHPFO3 (ORCPT ); Mon, 16 Aug 2004 01:14:29 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8.1-P0 From: Lee Revell To: Ingo Molnar Cc: Florian Schmidt , linux-kernel , Felipe Alfaro Solana In-Reply-To: <20040816045110.GA15841@elte.hu> References: <1092432929.3450.78.camel@mindpipe> <20040814072009.GA6535@elte.hu> <20040815115649.GA26259@elte.hu> <20040816022554.16c3c84a@mango.fruits.de> <1092622121.867.109.camel@krustophenia.net> <20040816024314.GA8960@elte.hu> <20040816030818.GA10685@elte.hu> <1092629953.810.23.camel@krustophenia.net> <20040816042653.GA14738@elte.hu> <1092630624.810.30.camel@krustophenia.net> <20040816045110.GA15841@elte.hu> Content-Type: text/plain Message-Id: <1092633318.801.11.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Mon, 16 Aug 2004 01:15:19 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2004-08-16 at 00:51, Ingo Molnar wrote: > * Lee Revell wrote: > seems we need a lock-break in the innermost loop of copy_page_range(). > That loop processes up to 1024 pages currently, before the lock-break in > the outer loop happens. Large GUI processes are more likely to have full > 4MB regions mapped & populated. > > i suspect you could trigger a similarly bad latency by doing a fork() in > mlockall-test.cc - the attached mlockall-test2.cc does this. Do you get > bad latencies? > Yes, mlockall-test2 with 10+MB of memory produces a 200us-3ms xrun about half the time. Lee