linux-kernel - Re: [PATCH] CMA: treat free cma pages as non-free if not ALLOC

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Date:	Tue, 20 Jan 2015 23:33:27 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Minchan Kim <minchan@...nel.org>, Hui Zhu <teawater@...il.com>
CC:	akpm@...ux-foundation.org, mgorman@...e.de, hannes@...xchg.org,
	riel@...hat.com, vbabka@...e.cz, iamjoonsoo.kim@....com,
	isimatu.yasuaki@...fujitsu.com, wangnan0@...wei.com,
	davidlohr@...com, cl@...ux.com, rientjes@...gle.com,
	sasha.levin@...cle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Hui Zhu <zhuhui@...omi.com>,
	Weixing Liu <liuweixing@...omi.com>
Subject: Re: [PATCH] CMA: treat free cma pages as non-free if not ALLOC_CMA
 on watermark checking

Hello Minchan,

How are you?

在 2015/1/19 14:55, Minchan Kim 写道:
> Hello,
> 
> On Sun, Jan 18, 2015 at 04:32:59PM +0800, Hui Zhu wrote:
>> From: Hui Zhu <zhuhui@...omi.com>
>>
>> The original of this patch [1] is part of Joonsoo's CMA patch series.
>> I made a patch [2] to fix the issue of this patch.  Joonsoo reminded me
>> that this issue affect current kernel too.  So made a new one for upstream.
> 
> Recently, we found many problems of CMA and Joonsoo tried to add more
> hooks into MM like agressive allocation but I suggested adding new zone

Just out of curiosity, "new zone"? Something like movable zone?

Thanks.

> would be more desirable than more hooks in mm fast path in various aspect.
> (ie, remove lots of hooks in hot path of MM, don't need reclaim hooks
>  for special CMA pages, don't need custom fair allocation for CMA).
> 
> Joonsoo is investigating the direction so please wait.
> If it turns out we have lots of hurdle to go that way,
> this direction(ie, putting more hooks) should be second plan.
> 
> Thanks.
> 

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