答复: [Lsf-pc] [LSF/MM TOPIC] Improving CMA

[朱辉 <zhuhui@xiaomi.com>]

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________________________________________
发件人: Gioh Kim <gioh.kim@lge.com>
发送时间: 2014年11月26日 12:25
收件人: Mel Gorman; Laura Abbott
抄送: lsf-pc@lists.linux-foundation.org; linux-mm@kvack.org; SeongJae Park; minchan@kernel.org; 朱辉; iamjoonsoo.kim@lge.com
主题: Re: [Lsf-pc] [LSF/MM TOPIC] Improving CMA

2014-11-25 오후 8:32에 Mel Gorman 이(가) 쓴 글:
> On Mon, Nov 24, 2014 at 05:54:14PM -0800, Laura Abbott wrote:
>> There have been a number of patch series posted designed to improve various
>> aspects of CMA. A sampling:
>>
>> https://lkml.org/lkml/2014/10/15/623
>> http://marc.info/?l=linux-mm&m=141571797202006&w=2
>> https://lkml.org/lkml/2014/6/26/549
>>
>> As far as I can tell, these are all trying to fix real problems with CMA but
>> none of them have moved forward very much from what I can tell. The goal of
>> this session would be to come out with an agreement on what are the biggest
>> problems with CMA and the best ways to solve them.
>>
>
> I think this is a good topic. Some of the issues have been brought up before
> at LSF/MM but they never made that much traction so it's worth revisiting. I
> haven't been paying close attention to the mailing list discussions but
> I've been a little worried that the page allocator paths are turning into
> a bigger and bigger mess. I'm also a bit worried that options such as
> migrating pages out of CMA areas that are about to be pinned for having
> callback options to forcibly free pages never went anywhere.
>

> I have two question.
>
> First, is GCMA able to replace CMA? It's news to me.
> I need some time to check GCMA.
>
> Second, is CMA popular enough to change allocator path?
> Yes, I need it.
> But I don't know any company uses it, and nobody seems to have interest in
> it.

We (xiaomi) use it in our new mibox.

Thanks,
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