Re: [RFC] SLAB : NUMA cache_free_alien() very expensive because ofvirt_to_slab(objp); nodeid = slabp->nodeid;

From: Christoph Lameter
Date: Tue Mar 20 2007 - 20:17:17 EST


On Tue, 20 Mar 2007, Eric Dumazet wrote:

> I understand we want to do special things (fallback and such tricks) at
> allocation time, but I believe that we can just trust the real nid of memory
> at free time.

Sorry no. The node at allocation time determines which node specific
structure tracks the slab. If we fall back then the node is allocated
from one node but entered in the node structure of another. Thus you
cannot free the slab without knowing the node at allocation time.

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