On Tue, Aug 30, 2016 at 06:10:46PM +0530, Aneesh Kumar K.V wrote:
> "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> writes:
>
> > ....
> >
> >> static inline void check_highest_zone(enum zone_type k)
> >> {
> >> - if (k > policy_zone && k != ZONE_MOVABLE)
> >> + if (k > policy_zone && k != ZONE_MOVABLE && !is_zone_cma_idx(k))
> >> policy_zone = k;
> >> }
> >>
> >
> >
> > Should we apply policy to allocation from ZONE CMA ?. CMA reserve
> > happens early and may mostly come from one node. Do we want the
> > CMA allocation to fail if we use mbind(MPOL_BIND) with a node mask not
> > including that node on which CMA is reserved, considering CMA memory is
> > going to be used for special purpose.
>
> Looking at this again, I guess CMA alloc is not going to depend on
> memory policy, but this is for other movable allocation ?
This is for usual file cache or anonymous page allocation. IIUC,
policy_zone is used to determine if mempolicy should be applied or not
and setting policy_zone to ZONE_CMA makes mempolicy less useful.
Thanks.
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