From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sun, 20 May 2001 19:38:59 +0200 (CEST) From: Mike Galbraith Subject: Re: [RFC][PATCH] Re: Linux 2.4.4-ac10 In-Reply-To: <20010520173252.Q754@nightmaster.csn.tu-chemnitz.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Ingo Oeser Cc: Rik van Riel , "Stephen C. Tweedie" , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Sun, 20 May 2001, Ingo Oeser wrote: > On Sun, May 20, 2001 at 05:29:49AM +0200, Mike Galbraith wrote: > > I'm not sure why that helps. I didn't put it in as a trick or > > anything though. I put it in because it didn't seem like a > > good idea to ever have more cleaned pages than free pages at a > > time when we're yammering for help.. so I did that and it helped. > > The rationale for this is easy: free pages is wasted memory, > clean pages is hot, clean cache. The best state a cache can be in. Sure. Under low load, cache is great. Under stress, keeping it is not an option though ;-) We're at or beyond capacity and moving at a high delda V (people yammering for help). If you can recognize and kill the delta rapidly by dumping that which you are going to have to dump anyway, you save time getting back on your feet. (my guess as to why dumping clean pages does measurably help in this case) -Mike -- 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.eu.org/Linux-MM/