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

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Message-ID: <Pine.LNX.4.64.0703221825050.13376@graphe.net>
Date:	Thu, 22 Mar 2007 18:25:16 -0700 (PDT)
From:	Christoph Lameter <christoph@...eter.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
cc:	Eric Dumazet <dada1@...mosbay.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: non-NUMA cache_free_alien() (was Re: [RFC] SLAB : NUMA
 cache_free_alien() very expensive because of virt_to_slab(objp); nodeid =
 slabp->nodeid;)

On Thu, 22 Mar 2007, Siddha, Suresh B wrote:

> > You should check num_possible_nodes(), or nr_node_ids (this one is cheaper, 
> > its a variable instead of a function call)
> 
> But that is based on compile time option, isn't it? Perhaps I need
> to use some other mechanism to find out the platform is not NUMA capable..

No its runtime.

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