linux-kernel - Re: [PATCH 08/40] mm: kmem_cache

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Message-ID: <463B7E5C.8030201@cs.helsinki.fi>
Date:	Fri, 04 May 2007 21:41:32 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <clameter@....com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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>
Subject: Re: [PATCH 08/40] mm: kmem_cache_objsize

Christoph Lameter wrote:
> Hmmm... Maybe lets have
> 
> unsigned kmem_estimate_pages(struct kmem_cache *slab_cache, int objects)
> 
> which would calculate the worst case memory scenario for allocation the 
> number of indicated objects?

IIRC this looks more or less what Peter had initially. I don't like the 
API because there's no way for slab (perhaps this is different for slub) 
how many pages you really need due to per-node and per-cpu caches, etc.

It's better that the slab tells you what it actually knows and lets the 
callers figure out what a worst-case upper bound is.

				Pekka


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