From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx129.postini.com [74.125.245.129]) by kanga.kvack.org (Postfix) with SMTP id 4A5716B02A7 for ; Tue, 13 Dec 2011 21:21:21 -0500 (EST) Subject: Re: [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance From: Shaohua Li In-Reply-To: <20111213203856.GA6312@tassilo.jf.intel.com> References: <1323655125.22361.376.camel@sli10-conroe> <20111213190632.GA5830@tassilo.jf.intel.com> <20111213203856.GA6312@tassilo.jf.intel.com> Content-Type: text/plain; charset="UTF-8" Date: Wed, 14 Dec 2011 10:33:47 +0800 Message-ID: <1323830027.22361.401.camel@sli10-conroe> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andi Kleen Cc: Christoph Lameter , lkml , linux-mm , Andrew Morton , Jens Axboe , "lee.schermerhorn@hp.com" , David Rientjes On Wed, 2011-12-14 at 04:38 +0800, Andi Kleen wrote: > On Tue, Dec 13, 2011 at 02:12:58PM -0600, Christoph Lameter wrote: > > On Tue, 13 Dec 2011, Andi Kleen wrote: > > > > > I would prefer to add a new policy (INTERLEAVE_MULTI or so) for this > > > instead of a global sysctl, that takes the additional parameter. > > > > That would require a change of all scripts and code that uses > > MPOL_INTERLEAVE. Lets not do that. > > Yes, but setting a sysctl would need the same right? > > It's not clear that all workloads want this. > > With a global switch only you cannot set it case by case. That's what I want to avoid letting each apps to explicitly do it, it's a lot of burden. That's true only workload with heavy I/O wants this. but I don't expect it will harm other workloads. >> Also I don't like having more per task state. Could you compute this >> from the address instead even for the process policy case? > >That sounds good. the process policy case doesn't give an address for allocation. Thanks, Shaohua -- 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