From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with SMTP id 2DC846B005A for ; Thu, 6 Aug 2009 09:11:39 -0400 (EDT) Message-ID: <4A7AD681.3090709@redhat.com> Date: Thu, 06 Aug 2009 09:11:29 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [RFC] respect the referenced bit of KVM guest pages? References: <20090805024058.GA8886@localhost> <20090805155805.GC23385@random.random> <20090806100824.GO23385@random.random> <4A7AAE07.1010202@redhat.com> <20090806102057.GQ23385@random.random> <20090806105932.GA1569@localhost> In-Reply-To: <20090806105932.GA1569@localhost> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Wu Fengguang Cc: Andrea Arcangeli , Avi Kivity , "Dike, Jeffrey G" , "Yu, Wilfred" , "Kleen, Andi" , Hugh Dickins , Andrew Morton , Christoph Lameter , KOSAKI Motohiro , Mel Gorman , LKML , linux-mm List-ID: Wu Fengguang wrote: > This is a quick hack to materialize the idea. It remembers roughly > the last 32*SWAP_CLUSTER_MAX=1024 active (mapped) pages scanned, > and if _all of them_ are referenced, then the referenced bit is > probably meaningless and should not be taken seriously. This has the potential to increase the number of active pages scanned by almost a factor 1024. Let me whip up an alternative idea when I get to the office later today. -- 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