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: <20070322224045.GA3200@linux-os.sc.intel.com>
Date:	Thu, 22 Mar 2007 15:40:45 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Christoph Lameter <christoph@...eter.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 11:12:39PM +0100, Eric Dumazet wrote:
> Siddha, Suresh B a écrit :
> >+	if (num_online_nodes() == 1)
> >+		use_alien_caches = 0;
> >+
> 
> Unfortunatly this part is wrong.

oops.

> 
> 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..

thanks,
suresh
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