Re: [RFC] CMA page migration failure due to buffers on bh_lru

[Michal Nazarewicz]

On Tue, Jun 24 2014, Gioh Kim <gioh.kim@xxxxxxx> 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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