linux-kernel - Re: [RFCv2] mm: page allocation for less fragmentation

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Message-ID: <20150325105640.GI4701@suse.de>
Date:	Wed, 25 Mar 2015 10:56:40 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Gioh Kim <gioh.kim@....com>
Cc:	akpm@...ux-foundation.org, riel@...hat.com, hannes@...xchg.org,
	rientjes@...gle.com, vdavydov@...allels.com,
	iamjoonsoo.kim@....com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, gunho.lee@....com
Subject: Re: [RFCv2] mm: page allocation for less fragmentation

On Wed, Mar 25, 2015 at 11:39:15AM +0900, Gioh Kim wrote:
> My driver allocates more than 40MB pages via alloc_page() at a time and
> maps them at virtual address. Totally it uses 300~400MB pages.
> 
> If I run a heavy load test for a few days in 1GB memory system, I cannot allocate even order=3 pages
> because-of the external fragmentation.
> 
> I thought I needed a anti-fragmentation solution for my driver.
> But there is no allocation function that considers fragmentation.
> The compaction is not helpful because it is only for movable pages, not unmovable pages.
> 
> This patch proposes a allocation function allocates only pages in the same pageblock.
> 

Is this not what CMA is for? Or creating a MOVABLE zone?

-- 
Mel Gorman
SUSE Labs
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