linux-kernel - Re: [patch v2 3/3] mm: page_alloc: fair zone allocator policy

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Date:	Fri, 02 Aug 2013 13:51:54 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Zlatko Calusic <zcalusic@...sync.net>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v2 3/3] mm: page_alloc: fair zone allocator policy

On 08/02/2013 11:37 AM, Johannes Weiner wrote:
> Each zone that holds userspace pages of one workload must be aged at a
> speed proportional to the zone size.  Otherwise, the time an
> individual page gets to stay in memory depends on the zone it happened
> to be allocated in.  Asymmetry in the zone aging creates rather
> unpredictable aging behavior and results in the wrong pages being
> reclaimed, activated etc.


> When zone_reclaim_mode is enabled, allocations will now spread out to
> all zones on the local node, not just the first preferred zone (which
> on a 4G node might be a tiny Normal zone).
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> Tested-by: Zlatko Calusic <zcalusic@...sync.net>

Reviewed-by: Rik van Riel <riel@...hat.com>


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