From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id 8E26A6B004D for ; Thu, 9 Jul 2009 18:26:00 -0400 (EDT) Message-ID: <4A567310.5@redhat.com> Date: Thu, 09 Jul 2009 18:45:36 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux References: <7cb22078-f200-45e3-a265-10cce2ae8224@default> In-Reply-To: <7cb22078-f200-45e3-a265-10cce2ae8224@default> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Dan Magenheimer Cc: Anthony Liguori , linux-kernel@vger.kernel.org, npiggin@suse.de, akpm@osdl.org, jeremy@goop.org, xen-devel@lists.xensource.com, tmem-devel@oss.oracle.com, alan@lxorguk.ukuu.org.uk, linux-mm@kvack.org, kurt.hackel@oracle.com, Rusty Russell , dave.mccracken@oracle.com, Marcelo Tosatti , sunil.mushran@oracle.com, Avi Kivity , Schwidefsky , chris.mason@oracle.com, Balbir Singh List-ID: Dan Magenheimer wrote: > But this means that either the content of that page must have been > preserved somewhere or the discard fault handler has sufficient > information to go back and get the content from the source (e.g. > the filesystem). Or am I misunderstanding? The latter. Only pages which can be fetched from source again are marked as volatile. > But IMHO this is a corollary of the fundamental difference. CMM2's > is more the "VMware" approach which is that OS's should never have > to be modified to run in a virtual environment. Actually, the CMM2 mechanism is quite invasive in the guest operating system's kernel. > ( I don't see why CMM2 provides more flexibility. I don't think anyone is arguing that. One thing that people have argued is that CMM2 can be more efficient, and easier to get the policy right in the face of multiple guest operating systems. -- 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