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

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Message-ID: <53ACAB82.6020201@lge.com>
Date:	Fri, 27 Jun 2014 08:23:46 +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: Re: [RFC] CMA page migration failure due to buffers on bh_lru



2014-06-27 오전 12:57, Michal Nazarewicz 쓴 글:
> On Tue, Jun 24 2014, Gioh Kim <gioh.kim@....com> wrote:
>> 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.
>
> Just to make sure I understood you correctly, you're saying Laura's
> patch at <https://lkml.org/lkml/2012/8/31/313> fixes your issue?
>

Yes, it is.
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