netdev - Re: [RFC][PATCH 5/6] slab: kmem_cache_objs_to

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Message-ID: <Pine.LNX.4.64.0611301053340.23820@schroedinger.engr.sgi.com>
Date:	Thu, 30 Nov 2006 10:55:51 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	netdev@...r.kernel.org, linux-mm@...ck.org,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC][PATCH 5/6] slab: kmem_cache_objs_to_pages()

On Thu, 30 Nov 2006, Peter Zijlstra wrote:

> +unsigned int kmem_cache_objs_to_pages(struct kmem_cache *cachep, int nr)
> +{
> +	return ((nr + cachep->num - 1) / cachep->num) << cachep->gfporder;

cachep->num refers to the number of objects in a slab of gfporder.

thus

return (nr + cachep->num - 1) / cachep->num;

But then this is very optimistic estimate that assumes a single node and 
no free objects in between.
-
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