From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-we0-f173.google.com (mail-we0-f173.google.com [74.125.82.173]) by kanga.kvack.org (Postfix) with ESMTP id 638FD6B0031 for ; Thu, 10 Jul 2014 08:14:23 -0400 (EDT) Received: by mail-we0-f173.google.com with SMTP id t60so8937870wes.32 for ; Thu, 10 Jul 2014 05:14:22 -0700 (PDT) Received: from zene.cmpxchg.org (zene.cmpxchg.org. [2a01:238:4224:fa00:ca1f:9ef3:caee:a2bd]) by mx.google.com with ESMTPS id z20si12395452wij.18.2014.07.10.05.14.22 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 10 Jul 2014 05:14:22 -0700 (PDT) Date: Thu, 10 Jul 2014 08:14:19 -0400 From: Johannes Weiner Subject: Re: [PATCH 5/6] mm: page_alloc: Abort fair zone allocation policy when remotes nodes are encountered Message-ID: <20140710121419.GM29639@cmpxchg.org> References: <1404893588-21371-1-git-send-email-mgorman@suse.de> <1404893588-21371-6-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1404893588-21371-6-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Andrew Morton , Linux Kernel , Linux-MM , Linux-FSDevel On Wed, Jul 09, 2014 at 09:13:07AM +0100, Mel Gorman wrote: > The purpose of numa_zonelist_order=zone is to preserve lower zones > for use with 32-bit devices. If locality is preferred then the > numa_zonelist_order=node policy should be used. Unfortunately, the fair > zone allocation policy overrides this by skipping zones on remote nodes > until the lower one is found. While this makes sense from a page aging > and performance perspective, it breaks the expected zonelist policy. This > patch restores the expected behaviour for zone-list ordering. > > Signed-off-by: Mel Gorman 32-bit NUMA? :-) Anyway, this change also cuts down the fair pass overhead on bigger NUMA machines, so I'm all for it. Acked-by: Johannes Weiner -- 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