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Date:	Thu, 10 Jul 2014 08:14:19 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 5/6] mm: page_alloc: Abort fair zone allocation policy
 when remotes nodes are encountered

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 <mgorman@...e.de>

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 <hannes@...xchg.org>
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