From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with SMTP id 853376B004F for ; Tue, 7 Jul 2009 04:36:52 -0400 (EDT) Received: from m6.gw.fujitsu.co.jp ([10.0.50.76]) by fgwmail7.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n679KDOU003343 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Tue, 7 Jul 2009 18:20:13 +0900 Received: from smail (m6 [127.0.0.1]) by outgoing.m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 55AEB45DE50 for ; Tue, 7 Jul 2009 18:20:13 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (s6.gw.fujitsu.co.jp [10.0.50.96]) by m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 3871C45DD72 for ; Tue, 7 Jul 2009 18:20:13 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 1C7131DB803E for ; Tue, 7 Jul 2009 18:20:13 +0900 (JST) Received: from m108.s.css.fujitsu.com (m108.s.css.fujitsu.com [10.249.87.108]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id B221BE08004 for ; Tue, 7 Jul 2009 18:20:12 +0900 (JST) Date: Tue, 7 Jul 2009 18:18:29 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [RFC][PATCH 0/4] ZERO PAGE again v2 Message-Id: <20090707181829.10d48272.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <4A530FD4.7060606@redhat.com> References: <20090707165101.8c14b5ac.kamezawa.hiroyu@jp.fujitsu.com> <20090707084750.GX2714@wotan.suse.de> <4A530FD4.7060606@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Avi Kivity Cc: Nick Piggin , "linux-mm@kvack.org" , "hugh.dickins@tiscali.co.uk" , "akpm@linux-foundation.org" , torvalds@linux-foundation.org List-ID: On Tue, 07 Jul 2009 12:05:24 +0300 Avi Kivity wrote: > On 07/07/2009 11:47 AM, Nick Piggin wrote: > >> Any comments are welcome. > >> > > > > Can we just try to wean them off it? Using zero page for huge sparse > > matricies is probably not ideal anyway because it needs to still be > > faulted in and it occupies TLB space. They might see better performance > > by using a better algorithm. > > > > For kvm live migration, I've thought of extending mincore() to report if > a page will be read as zeros. > BTW, ksm can scale enough to combine all pages which just includes zero ? No heavy cache ping-pong without zero-page ? Thanks, -Kame -- 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