Re: [PATCH v5 0/6] Introduce ZONE_CMA

[Aneesh Kumar K.V]

Joonsoo Kim <js1304@xxxxxxxxx> writes:

> 2016-08-29 18:27 GMT+09:00 Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>:
>> js1304@xxxxxxxxx writes:
>>
>>> From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
>>>
>>> Hello,
>>>
>>> Changes from v4
>>> o Rebase on next-20160825
>>> o Add general fix patch for lowmem reserve
>>> o Fix lowmem reserve ratio
>>> o Fix zone span optimizaion per Vlastimil
>>> o Fix pageset initialization
>>> o Change invocation timing on cma_init_reserved_areas()
>>
>> I don't see much information regarding how we interleave between
>> ZONE_CMA and other zones for movable allocation. Is that explained in
>> any of the patch ? The fair zone allocator got removed by
>> e6cbd7f2efb433d717af72aa8510a9db6f7a7e05
>
> Interleaving would not work since the fair zone allocator policy is removed.
> I don't think that it's a big problem because it is just matter of
> timing to fill
> up the memory. Eventually, memory on ZONE_CMA will be fully used in
> any case.

Does that mean a CMA allocation will now be slower because in most case we
will need to reclaim ? The zone list will now have ZONE_CMA in the
beginning right ?

-aneesh