linux-kernel - Re: [patch 2/3] cpu alloc: Use in slub

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Message-ID: <48E642CA.2050405@linux-foundation.org>
Date:	Fri, 03 Oct 2008 11:05:30 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jeremy@...p.org, ebiederm@...ssion.com,
	travis@....com, herbert@...dor.apana.org.au, xemul@...nvz.org,
	penberg@...helsinki.fi
Subject: Re: [patch 2/3] cpu alloc: Use in slub

Eric Dumazet wrote:
>
> Then maybe change MAX_NUMNODES to 0 or 1 to reflect
> node[] is dynamically sized ?

See kmem_cache_init(). It only allocates the used bytes. If you only have a
single nodes then only 1 pointer will be allocated.

#ifdef CONFIG_NUMA
        kmem_size = offsetof(struct kmem_cache, node) +
                                nr_node_ids * sizeof(struct kmem_cache_node *);
#else


That does not work for the statically allocated kmalloc array though.



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