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

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Date:	Fri, 4 May 2007 13:54:32 +0300
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>,
	"James Bottomley" <James.Bottomley@...eleye.com>,
	"Mike Christie" <michaelc@...wisc.edu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Daniel Phillips" <phillips@...gle.com>,
	"Christoph Lameter" <clameter@....com>
Subject: Re: [PATCH 08/40] mm: kmem_cache_objsize

On 5/4/07, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> Expost buffer_size in order to allow fair estimates on the actual space
> used/needed.

[snip]

>  #ifdef CONFIG_SLAB_FAIR
> -static inline int slab_alloc_rank(gfp_t flags)
> +static __always_inline int slab_alloc_rank(gfp_t flags)
>  {
>         return gfp_to_rank(flags);
>  }
>  #else
> -static inline int slab_alloc_rank(gfp_t flags)
> +static __always_inline int slab_alloc_rank(gfp_t flags)
>  {
>         return 0;
>  }

Me thinks this hunk doesn't belong in this patch.

> @@ -3815,6 +3815,12 @@ unsigned int kmem_cache_size(struct kmem
>  }
>  EXPORT_SYMBOL(kmem_cache_size);
>
> +unsigned int kmem_cache_objsize(struct kmem_cache *cachep)
> +{
> +       return cachep->buffer_size;
> +}
> +EXPORT_SYMBOL_GPL(kmem_cache_objsize);
> +
>  const char *kmem_cache_name(struct kmem_cache *cachep)
>  {
>         return cachep->name;
> @@ -4512,3 +4518,9 @@ unsigned int ksize(const void *objp)
>
>         return obj_size(virt_to_cache(objp));
>  }
> +
> +unsigned int kobjsize(size_t size)
> +{
> +       return kmem_cache_objsize(kmem_find_general_cachep(size, 0));
> +}
> +EXPORT_SYMBOL_GPL(kobjsize);

Looks good to me. Unfortunately, you need to do SLUB as well. Aah, the
wonders of three kernel memory allocators... ;-)

                                     Pekka
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