Message-ID: <53A8D092.4040801@lge.com>
Date: Tue, 24 Jun 2014 10:12:50 +0900
From: Gioh Kim <gioh.kim@lge.com>
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To: Michal Nazarewicz <mina86@mina86.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
CC: Joonsoo Kim <iamjoonsoo.kim@lge.com>, Mel Gorman <mgorman@suse.de>,
        =?EUC-KR?B?wMywx8ij?= <gunho.lee@lge.com>
Subject: [RFC] CMA page migration failure due to buffers on bh_lru
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Sender: linux-kernel-owner@vger.kernel.org


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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