From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id AF2FB6B009F for ; Sun, 26 Jul 2009 10:56:13 -0400 (EDT) Message-ID: <4A6C6F96.2050207@redhat.com> Date: Sun, 26 Jul 2009 18:00:38 +0300 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux References: <4A5A1A51.2080301@redhat.com> <4A5A3AC1.5080800@codemonkey.ws> <20090713201745.GA3783@think> <4A5B9B55.6000404@codemonkey.ws> <20090713210112.GC3783@think> <4A5BA451.5070604@codemonkey.ws> In-Reply-To: <4A5BA451.5070604@codemonkey.ws> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Anthony Liguori Cc: Chris Mason , Dan Magenheimer , Rik van Riel , 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, Schwidefsky , Balbir Singh List-ID: On 07/14/2009 12:17 AM, Anthony Liguori wrote: > Chris Mason wrote: >> On Mon, Jul 13, 2009 at 03:38:45PM -0500, Anthony Liguori wrote: >> I'll definitely grant that caching with writethough adds more caching, >> but it does need trim support before it is similar to tmem. > > I think trim is somewhat orthogonal but even if you do need it, the > nice thing about implementing ATA trim support verses a > paravirtualization is that it works with a wide variety of guests. > > From the perspective of the VMM, it seems like a good thing. trim is also lovely in that images will no longer grow monotonously even though guest disk usage is constant or is even reduced. -- error compiling committee.c: too many arguments to function -- 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