Re: [PATCH] kswapd: no need reclaim cma pages triggered by unmovable allocation

David Hildenbrand
2021-03-15T16:13:55Z

On 15.03.21 17:09, Michal Hocko wrote:
> On Mon 15-03-21 16:46:33, David Hildenbrand wrote:
>> On 13.03.21 09:31, zhou wrote:
> [...]
>>> This optimization can avoid ~3% unnecessary isolations from cma
>>> (cma isolated / total isolated) with configuration of total 100Mb
>>> cma pages.
>>
>> Can you say a few words about interaction with ZONE_MOVABLE, which behaves
>> similar to CMA? I.e., does the same apply to ZONE_MOVABLE? Is it already
>> handled?
>
> No, the movable zone shouldn't be affected as the reclaim is zone aware.
> The problem is that CMA doesn't belong to any particular zone. This is
> something Joonsoo worked in the past and I believe following up on that
> work has been recommended last time a similar/same approach like this
> patch was proposed.

Okay, thanks - that's what I expected.

--
Thanks,

David / dhildenb