linux-kernel - Re: [PATCH 08/29] mm: kmem_cache_objs_to

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Date:	Wed, 21 Feb 2007 17:47:59 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
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>
Subject: Re: [PATCH 08/29] mm: kmem_cache_objs_to_pages()

Hi Peter,

On 2/21/07, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> Provide a method to calculate the number of pages needed to store a given
> number of slab objects (upper bound when considering possible partial and
> free slabs).

So how does this work? You ask the slab allocator how many pages you
need for a given number of objects and then those pages are available
to it via the page allocator? Can other users also dip into those
reserves?

I would prefer we simply have an API for telling the slab allocator to
keep certain number of pages in a reserve for a cache rather than
exposing internals such as object size to rest of the world.

                                 Pekka
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