Re: [PATCH] Export symbol ksize()

[Pekka Enberg <penberg@cs.helsinki.fi>]

On Tue, Feb 17, 2009 at 6:17 PM, Christoph Lameter
<cl@linux-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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