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.4.64.0703221510080.9678@graphe.net>
Date:	Thu, 22 Mar 2007 15:10:29 -0700 (PDT)
From:	Christoph Lameter <christoph@...eter.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
cc:	Andi Kleen <andi@...stfloor.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	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:

> @@ -1394,6 +1394,9 @@ void __init kmem_cache_init(void)
>  	int order;
>  	int node;
>  
> +	if (num_online_nodes() == 1)
> +		use_alien_caches = 0;
> +

What happens if you bring up a second node?

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