From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262882AbTDFJOi (for ); Sun, 6 Apr 2003 05:14:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262883AbTDFJOi (for ); Sun, 6 Apr 2003 05:14:38 -0400 Received: from to-telus.redhat.com ([207.219.125.105]:13817 "EHLO touchme.toronto.redhat.com") by vger.kernel.org with ESMTP id S262882AbTDFJOh (for ); Sun, 6 Apr 2003 05:14:37 -0400 Date: Sun, 6 Apr 2003 05:26:03 -0400 From: Benjamin LaHaise To: William Lee Irwin III , Andrew Morton , andrea@suse.de, mbligh@aracnet.com, mingo@elte.hu, hugh@veritas.com, dmccr@us.ibm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: objrmap and vmtruncate Message-ID: <20030406052603.A4440@redhat.com> References: <20030404163154.77f19d9e.akpm@digeo.com> <12880000.1049508832@flay> <20030405024414.GP16293@dualathlon.random> <20030404192401.03292293.akpm@digeo.com> <20030405040614.66511e1e.akpm@digeo.com> <20030405232524.GD1828@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20030405232524.GD1828@holomorphy.com>; from wli@holomorphy.com on Sat, Apr 05, 2003 at 03:25:24PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 05, 2003 at 03:25:24PM -0800, William Lee Irwin III wrote: > I apparently erred when I claimed this kind of test would not provide > useful figures of merit for page replacement algorithms. There appears > to be more to life than picking the right pages. This is precisely the conclusion which davem and myself came to, and explained at the beginning of this whole ordeal. It all boils down to the complexity of the algorithm, and the fact that the number of cache misses scales with that. Can we get on with merging pgcl to mitigate some of the rmap costs now? ;-) -ben