Re: [LSF/MM ATTEND] 2016: Requests to attend MM-summit

[Vlastimil Babka <vbabka@suse.cz>]

On 26.1.2016 8:38, Joonsoo Kim wrote:
> On Mon, Jan 25, 2016 at 03:37:06PM -0800, Laura Abbott wrote:
>>
>> Is that series going to conflict with the work done for ZONE_DEVICE or run
>> into similar problems?
>> 033fbae988fcb67e5077203512181890848b8e90 (mm: ZONE_DEVICE for "device memory")
>> has commit text about running out of ZONE_SHIFT bits and needing to get
>> rid of ZONE_DMA instead so it seems like ZONE_CMA would run into the same
>> problem.
> 
> Hmm... I'm not sure. I need a investigation. What I did before is
> enlarging section size. Then, number of section is reduced and we need
> less section bit in struct page's flag. This worked for my sparsemem
> configuration but I'm not sure other conguration. Perhaps, in other
> congifuration, we can limit node bits and max number of node.

This seems to be a solution proposed for the ZONE_DMA and ZONE_DEVICE
coexistence https://lkml.org/lkml/2016/1/25/1233
It wouldn't help with ZONE_CMA, so I guess it's time to look for a more robust one.

> Thanks.
> 
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