On Tue, Aug 30, 2016 at 06:10:46PM +0530, Aneesh Kumar K.V wrote:

"Aneesh Kumar K.V" [off-list ref] writes:

quoted

....

quoted

 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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