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: <20070323141407.GB20548@one.firstfloor.org>
Date:	Fri, 23 Mar 2007 15:14:07 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <christoph@...eter.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	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, Mar 22, 2007 at 06:25:16PM -0700, Christoph Lameter wrote:
> 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.

I don't see any code that would ever change the mask from the compile
default. But that is easy to fix.

-Andi

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