Re: [PATCH] CMA: treat free cma pages as non-free if not ALLOC_CMA on watermark checking

[Zhang Yanfei]

Hello Minchan,

How are you?

å 2015/1/19 14:55, Minchan Kim åé:
> Hello,
> 
> On Sun, Jan 18, 2015 at 04:32:59PM +0800, Hui Zhu wrote:
>> From: Hui Zhu <zhuhui@xxxxxxxxxx>
>>
>> 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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