linux-kernel - Re: [PATCH 05/34] mm, vmscan: begin reclaiming pages on a per-node basis

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Message-ID: <20160712135435.GB5881@cmpxchg.org>
Date:	Tue, 12 Jul 2016 09:54:35 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/34] mm, vmscan: begin reclaiming pages on a per-node
 basis

On Fri, Jul 08, 2016 at 10:34:41AM +0100, Mel Gorman wrote:
> This patch makes reclaim decisions on a per-node basis.  A reclaimer knows
> what zone is required by the allocation request and skips pages from
> higher zones.  In many cases this will be ok because it's a GFP_HIGHMEM
> request of some description.  On 64-bit, ZONE_DMA32 requests will cause
> some problems but 32-bit devices on 64-bit platforms are increasingly
> rare.  Historically it would have been a major problem on 32-bit with big
> Highmem:Lowmem ratios but such configurations are also now rare and even
> where they exist, they are not encouraged.  If it really becomes a
> problem, it'll manifest as very low reclaim efficiencies.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>