linux-kernel - Re: Re: [BLOCK] bh: Ensure bh fits within a page

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Message-ID: <84144f020608011208x3c40450cm85af5a2d18ac854d@mail.gmail.com>
Date:	Tue, 1 Aug 2006 22:08:33 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Andrew Morton" <akpm@...l.org>,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, ext2-devel@...ts.sourceforge.net
Subject: Re: Re: [BLOCK] bh: Ensure bh fits within a page

Hi,

On 8/1/06, Christoph Lameter <clameter@....com> wrote:
> The slab allocator gives no guarantee that a structure is not straddling a
> page boundary regardless of debug or not. It may just happen that the
> objects are arranged if kmem_cache_cretae() is called with certain
> parameters. Another arch with other cacheline alignment and another page
> size may arrange the objects differently.

Indeed. You could try to force zero-order page allocations for a
cache, but we are probably better of using the page allocator directly
or crafting a special purpose allocator for the block layer.

                                 Pekka
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