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

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Message-ID: <xa1td2dvmznq.fsf@mina86.com>
Date:	Thu, 26 Jun 2014 17:57:45 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Gioh Kim <gioh.kim@....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

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?

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