Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932674AbWCWS0u (ORCPT ); Thu, 23 Mar 2006 13:26:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932677AbWCWS0u (ORCPT ); Thu, 23 Mar 2006 13:26:50 -0500 Received: from mx1.redhat.com ([66.187.233.31]:42217 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S932674AbWCWS0t (ORCPT ); Thu, 23 Mar 2006 13:26:49 -0500 Date: Thu, 23 Mar 2006 13:26:16 -0500 (EST) From: Rik van Riel X-X-Sender: riel@cuia.boston.redhat.com To: Linus Torvalds cc: Marcelo Tosatti , Andrew Morton , Peter Zijlstra , linux-mm@kvack.org, linux-kernel@vger.kernel.org, bob.picco@hp.com, iwamoto@valinux.co.jp, christoph@lameter.com, wfg@mail.ustc.edu.cn, npiggin@suse.de Subject: Re: [PATCH 00/34] mm: Page Replacement Policy Framework In-Reply-To: Message-ID: References: <20060322223107.12658.14997.sendpatchset@twins.localnet> <20060322145132.0886f742.akpm@osdl.org> <20060323205324.GA11676@dmt.cnet> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1111 Lines: 30 On Thu, 23 Mar 2006, Linus Torvalds wrote: > a) the current one actually seems to have beaten the on-comers (except > for loads that were actually made up to try to defeat LRU) A valid concern. I am of the opinion that we should try to introduce change in small increments, whereever possible. > b) is page replacement actually a huge issue? Being involved in RHEL support occasionally: YES! Page replacement may be doing the right thing in 99% of the cases, but the misbehaviour in "corner cases" can be very significant. I put "corner cases" in quotes because they are not cornercases to the users - these loads tend to be the main workload on some systems! IMHO, improving performance for most workloads is nowhere near as important as increasing the coverage of the VM, ie. the number of workloads that it handles well. -- All Rights Reversed - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/