linux-kernel - Re: [PATCH] mm/slab: add a leak decoder callback

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Message-ID: <0000013c3f0c8af2-361e64b5-f822-4a93-a67e-b2902bb336fc-000000@email.amazonses.com>
Date:	Tue, 15 Jan 2013 16:30:52 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Liu Bo <bo.li.liu@...cle.com>
cc:	linux-mm@...ck.org, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, Zach Brown <zab@...bo.net>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH] mm/slab: add a leak decoder callback

On Mon, 14 Jan 2013, Liu Bo wrote:

> This adds a leak decoder callback so that kmem_cache_destroy()
> can use to generate debugging output for the allocated objects.

Interesting idea.

> @@ -3787,6 +3789,9 @@ static int slab_unmergeable(struct kmem_cache *s)
>  	if (s->ctor)
>  		return 1;
>
> +	if (s->decoder)
> +		return 1;
> +
>  	/*
>  	 * We may have set a slab to be unmergeable during bootstrap.
>  	 */

The merge processing occurs during kmem_cache_create and you are setting
up the decoder field afterwards! Wont work.


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