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Date: Tue, 20 Mar 2007 17:18:04 -0700 (PDT) From: Christoph Lameter <christoph@...eter.com> To: Andi Kleen <andi@...stfloor.org> cc: Eric Dumazet <dada1@...mosbay.com>, Andrew Morton <akpm@...ux-foundation.org>, linux kernel <linux-kernel@...r.kernel.org> Subject: Re: [RFC] SLAB : NUMA cache_free_alien() very expensive because of virt_to_slab(objp); nodeid = slabp->nodeid; On Tue, 20 Mar 2007, Andi Kleen wrote: > > > 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. We usually use page_to_nid(). Sure this will determine the node the object resides on. But this may not be the node on which the slab is tracked since there may have been a fallback at alloc time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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