netdev - Re: [PATCH 08/40] mm: kmem_cache

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Message-Id: <1178302904.2767.6.camel@lappy>
Date:	Fri, 04 May 2007 20:21:44 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Thomas Graf <tgraf@...g.ch>,
	David Miller <davem@...emloft.net>,
	James Bottomley <James.Bottomley@...elEye.com>,
	Mike Christie <michaelc@...wisc.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Phillips <phillips@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 08/40] mm: kmem_cache_objsize

On Fri, 2007-05-04 at 11:04 -0700, Christoph Lameter wrote:
> On Fri, 4 May 2007, Peter Zijlstra wrote:
> 
> > > I could add a function that tells you how many object you could allocate 
> > > from a slab without the page allocator becoming involved? It would count 
> > > the object slots available on the partial slabs.
> > 
> > I need to know how many pages to reserve to allocate a given number of
> > items from a given slab; assuming the partial slabs are empty. That is,
> > I need a worst case upper bound.
> 
> Ok so you really need the number of objects per page? If you know the 
> number of objects then you can calculate the pages needed which would be 
> the maximum memory needed?

Yes, that would work.



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