From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx184.postini.com [74.125.245.184]) by kanga.kvack.org (Postfix) with SMTP id 7489F6B00ED for ; Mon, 19 Mar 2012 07:39:53 -0400 (EDT) Message-ID: <1332157166.18960.299.camel@twins> Subject: Re: [RFC][PATCH 00/26] sched/numa From: Peter Zijlstra Date: Mon, 19 Mar 2012 12:39:26 +0100 In-Reply-To: <1332155527.18960.292.camel@twins> References: <20120316144028.036474157@chello.nl> <4F670325.7080700@redhat.com> <1332155527.18960.292.camel@twins> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Avi Kivity Cc: Linus Torvalds , Andrew Morton , Thomas Gleixner , Ingo Molnar , Paul Turner , Suresh Siddha , Mike Galbraith , "Paul E. McKenney" , Lai Jiangshan , Dan Smith , Bharata B Rao , Lee Schermerhorn , Andrea Arcangeli , Rik van Riel , Johannes Weiner , linux-kernel@vger.kernel.org, linux-mm@kvack.org On Mon, 2012-03-19 at 12:12 +0100, Peter Zijlstra wrote: > > - doesn't work well with large pages >=20 > That's for someone who cares about large pages to sort, isn't it? Also, > I thought you virt people only used THP anyway, and those work just fine > (they get broken down, and presumably something will build them back up > on the other side).=20 Note that all it would take is to make THP swap work. That on its own might make sense too since writing a 2M stip of data is probably as fast as a single 4K page on many of the rotating rust things. No idea on SSD, but those things are typically fast either way. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758223Ab2CSLkG (ORCPT ); Mon, 19 Mar 2012 07:40:06 -0400 Received: from casper.infradead.org ([85.118.1.10]:40931 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754752Ab2CSLkE convert rfc822-to-8bit (ORCPT ); Mon, 19 Mar 2012 07:40:04 -0400 Message-ID: <1332157166.18960.299.camel@twins> Subject: Re: [RFC][PATCH 00/26] sched/numa From: Peter Zijlstra To: Avi Kivity Cc: Linus Torvalds , Andrew Morton , Thomas Gleixner , Ingo Molnar , Paul Turner , Suresh Siddha , Mike Galbraith , "Paul E. McKenney" , Lai Jiangshan , Dan Smith , Bharata B Rao , Lee Schermerhorn , Andrea Arcangeli , Rik van Riel , Johannes Weiner , linux-kernel@vger.kernel.org, linux-mm@kvack.org Date: Mon, 19 Mar 2012 12:39:26 +0100 In-Reply-To: <1332155527.18960.292.camel@twins> References: <20120316144028.036474157@chello.nl> <4F670325.7080700@redhat.com> <1332155527.18960.292.camel@twins> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2012-03-19 at 12:12 +0100, Peter Zijlstra wrote: > > - doesn't work well with large pages > > That's for someone who cares about large pages to sort, isn't it? Also, > I thought you virt people only used THP anyway, and those work just fine > (they get broken down, and presumably something will build them back up > on the other side). Note that all it would take is to make THP swap work. That on its own might make sense too since writing a 2M stip of data is probably as fast as a single 4K page on many of the rotating rust things. No idea on SSD, but those things are typically fast either way.