Messages in this thread | | | Date | Fri, 11 Jul 2014 12:24:51 -0400 | From | Tejun Heo <> | Subject | Re: [RFC Patch V1 07/30] mm: Use cpu_to_mem()/numa_mem_id() to support memoryless node |
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On Fri, Jul 11, 2014 at 11:19:14AM -0500, Christoph Lameter wrote: > Yes that works. But if we want a consistent node to allocate from (and > avoid the fallbacks) then we need this patch. I think this is up to those > needing memoryless nodes to figure out what semantics they need.
I'm not following what you're saying. Are you saying that we need to spread numa_mem_id() all over the place for GFP_THISNODE users on memless nodes? There aren't that many users of GFP_THISNODE. Wouldn't it make far more sense to just change them? Or just introduce a new GFP flag GFP_CLOSE_OR_BUST which allows falling back to the nearest local node for memless nodes. There's no reason to leak this information outside allocator proper.
Thanks.
-- tejun
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