From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sd0208e0.au.ibm.com (d23rh904.au.ibm.com [202.81.18.202]) by ausmtp04.au.ibm.com (8.13.8/8.13.8) with ESMTP id l1MFpwgI287650 for ; Fri, 23 Feb 2007 02:51:58 +1100 Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.250.242]) by sd0208e0.au.ibm.com (8.13.8/8.13.8/NCO v8.2) with ESMTP id l1MFdTg6185352 for ; Fri, 23 Feb 2007 02:39:30 +1100 Received: from d23av01.au.ibm.com (loopback [127.0.0.1]) by d23av01.au.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l1MFa0SK029193 for ; Fri, 23 Feb 2007 02:36:00 +1100 Message-ID: <45DDB85D.209@in.ibm.com> Date: Thu, 22 Feb 2007 21:05:57 +0530 From: Balbir Singh Reply-To: balbir@in.ibm.com MIME-Version: 1.0 Subject: Re: [PATCH] Take anonymous pages off the LRU if we have no swap References: <45DCD309.5010109@redhat.com> <45DCFD22.2020300@redhat.com> <45DD88E3.2@redhat.com> In-Reply-To: <45DD88E3.2@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel Cc: Christoph Lameter , akpm@linux-foundation.org, linux-mm@kvack.org, Vaidyanathan Srinivasan List-ID: Rik van Riel wrote: > Christoph Lameter wrote: >> On Wed, 21 Feb 2007, Rik van Riel wrote: >> > Absolutely. I am convinced that the whole "swappiness" thing > of scanning past the anonymous pages in order to find the page > cache pages will fall apart on 256GB systems even with somewhat > friendly workloads. > That should probably make a good case for splitting the LRU into unmapped and mapped page LRU's :-) I hope to get to it, implement it and get some results. A big global LRU is like a big piece of software that is requesting to be broken up. Scanning through uninteresting pages (in my case searching for pages belonging to particular container for my memory controller) is a big overhead. -- Warm Regards, Balbir Singh -- 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