Re: [BUGFIX] set_mempolicy(MPOL_INTERLEAV) N_HIGH_MEMORY aware

["KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>]

Andi Kleen wrote:
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> writes:
>
>> tested on x86-64/fake NUMA and ia64/NUMA.
>> (That ia64 is a host which orignal bug report used.)
>>
>> Maybe this is bigger patch than expected, but NODEMASK_ALLOC() will be a
>> way
>> to go, anyway. (even if CPUMASK_ALLOC is not used anyware yet..)
>> Kosaki tested this on ia64 NUMA. thanks.
>
> Note that low/high memory support in NUMA policy is only partial
> anyways, e.g. the VMA based policy only supports a single zone. That
> was by design choice and because NUMA has a lot of issues on 32bit due
> to the limited address space and is not widely used.
>
> So small fixes are ok but I wouldn't go to large effort to fix NUMA
> policy on 32bit.
>
ya, maybe you mention to something related to policy_zone.
It's checked only in bind code now. (from before 2.6.30..)
The bug was accessing NODE_DATA(nid), which is NULL.
(All possible node doesn't have pgdat)

Thanks,
-Kame


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