linux-kernel - Re: [PATCH] Export symbol ksize()

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Date:	Tue, 17 Feb 2009 19:03:28 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-crypto@...r.kernel.org, Geert.Uytterhoeven@...ycom.com
Subject: Re: [PATCH] Export symbol ksize()

On Tue, Feb 17, 2009 at 6:17 PM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> On Sun, 15 Feb 2009, Matt Mackall wrote:
>
>> And it -is- a category error. The fact that kmalloc is implemented on
>> top of kmem_cache_alloc is an implementation detail that callers should
>> not assume. They shouldn't call kfree() on kmem_cache_alloc objects
>> (even though it might just happen to work), nor should they call
>> ksize().
>
> ksize does not take a kmem_cache pointer and it is mainly used for
> figuring out how much space kmalloc really allocated for an object. As
> such its more part of the kmalloc/kfree set of calls than the
> kmem_cache_* calls.
>
> We could add another call
>
>        kmem_cache_size()
>
> for symmetries sake.

Hmm, kmem_cache_size() seems bit pointless to me. For
kmem_cache_create()'d caches, actual allocated size should be more or
less optimal with no extra space.

                                     Pekka
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