linux-kernel - Re: [RFC] SLAB : NUMA cache_free_alien() very expensive because of virt_to

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Date:	Tue, 20 Mar 2007 17:16:37 -0700 (PDT)
From:	Christoph Lameter <christoph@...eter.com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	Andi Kleen <andi@...stfloor.org>,
	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, 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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