From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 23 Mar 2006 13:26:16 -0500 (EST) From: Rik van Riel 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: owner-linux-mm@kvack.org Return-Path: 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 List-ID: 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org