Messages in this thread | | | Date | Tue, 20 Mar 2007 22:32:18 +0100 | From | Andi Kleen <> | Subject | Re: [RFC] SLAB : NUMA cache_free_alien() very expensive because of virt_to_slab(objp); nodeid = slabp->nodeid; |
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> > Is it possible virt_to_slab(objp)->nodeid being different from pfn_to_nid(objp) ? > > It is possible the page allocator falls back to another node than > requested. We would need to check that this never occurs.
The only way to ensure that would be to set a strict mempolicy. But I'm not sure that's a good idea -- after all you don't want to fail an allocation in this case.
But pfn_to_nid on the object like proposed by Eric should work anyways. But I'm not sure the tables used for that will be more often cache hot than the slab.
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