linux-kernel - [RFC] CMA page migration failure due to buffers on bh

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Date:	Tue, 24 Jun 2014 10:12:50 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	Michal Nazarewicz <mina86@...a86.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
CC:	Joonsoo Kim <iamjoonsoo.kim@....com>, Mel Gorman <mgorman@...e.de>,
	이건호 <gunho.lee@....com>
Subject: [RFC] CMA page migration failure due to buffers on bh_lru

Hello,

I am trying to apply CMA feature for my platform.
My kernel version, 3.10.x, is not allocating memory from CMA area so that I applied
a Joonsoo Kim's patch (https://lkml.org/lkml/2014/5/28/64).
Now my platform can use CMA area effectively.

But I have many failures to allocate memory from CMA area.
I found the same situation to Laura Abbott's patch descrbing, https://lkml.org/lkml/2012/8/31/313,
that releases buffer-heads attached at CPU's LRU list.

If Joonsoo's patch is applied and/or CMA feature is applied more and more,
buffer-heads problem is going to be serious definitely.

Please look into the Laura's patch again.
I think it must be applied with Joonsoo's patch.

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