linux-kernel - Re: [PATCH 04/31] mm, vmscan: begin reclaiming pages on a per-node basis

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Message-ID: <00cf01d1d66b$d0eb6eb0$72c24c10$@alibaba-inc.com>
Date:	Tue, 05 Jul 2016 11:17:51 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"Mel Gorman" <mgorman@...hsingularity.net>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, "Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 04/31] mm, vmscan: begin reclaiming pages on a per-node basis

> 
> 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>

>  mm/vmscan.c | 79 ++++++++++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 55 insertions(+), 24 deletions(-)