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

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Message-Id: <1164912917.6588.155.camel@twins>
Date:	Thu, 30 Nov 2006 19:55:17 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
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, 2006-11-30 at 10:55 -0800, Christoph Lameter wrote:
> 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.

Ah, my bad, thanks!

> 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.

Right, perhaps my bad in wording the intent; the needed information is
how many more pages would I need to grow the slab with in order to store
so many new object.

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