From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Subject: Re: [patch v2] slub: add option to disable higher order debugging
 slabs
Date: Tue, 7 Jul 2009 11:57:19 -0400 (EDT)
Message-ID: <alpine.DEB.1.10.0907071150010.5124@gentwo.org>
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To: David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Pekka Enberg <penberg-bbCR+/B0CizivPeTLB3BmA@public.gmane.org>, Larry Finger <Larry.Finger-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>, "Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Kernel Testers List <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>

On Tue, 7 Jul 2009, David Rientjes wrote:

> + * Debugging flags that require metadata to be stored in the slab, up to
> + * DEBUG_SIZE in size.
> + */
> +#define DEBUG_SIZE_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
> +#define DEBUG_SIZE (3 * sizeof(void *) + 2 * sizeof(struct track))

There is no need for DEBUG_SIZE since slub keeps both the size of the
object kmem_cache->objsize and the size with the metadata kmem_cache->size

If the order of both is different then the order would increase.