Re: [PATCH 2/3] x86: add numa_move_cpus_to_node

[Yinghai Lu]

Christoph Lameter wrote:
> On Mon, 11 May 2009, Yinghai Lu wrote:
> 
>>> This going to be fun for the allocators that have put their queues on the
>>> respective nodes. How are the various OS structures that were allocated on
>>> the node that is downed / upped relocated?
>> NODE_DATA is new allocated on that node is backed on line for the first time.
>>
>> per_cpu will still stay with old near node. because per_cpu is somehow preallocated for all possible cpu.
> 
> Slab allocators and page allocator use neither NODE_DATA nor percpu
> 
> It may be best to bring the processors down and up again if the node
> assignment changes. That will cause the allocators to reallocate the per
> cpu resources on the right node.

or let user util do that? aka before hotadd mem to that node, use /sys to bring
the cpu offine and put the cpus online after mem is added ?

YH
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