From: David Rientjes <rientjes@google.com>
To: Christoph Lameter <cl@linux.com>
Cc: Glauber Costa <glommer@parallels.com>,
Pekka Enberg <penberg@kernel.org>,
linux-mm@kvack.org, Joonsoo Kim <js1304@gmail.com>
Subject: Re: Common [01/19] slub: Add debugging to verify correct cache use on kmem_cache_free()
Date: Thu, 2 Aug 2012 13:37:09 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1208021334350.5454@chino.kir.corp.google.com> (raw)
In-Reply-To: <20120802201530.921218259@linux.com>
On Thu, 2 Aug 2012, Christoph Lameter wrote:
> Add additional debugging to check that the objects is actually from the cache
> the caller claims. Doing so currently trips up some other debugging code. It
> takes a lot to infer from that what was happening.
>
> Signed-off-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
> Index: linux-2.6/mm/slub.c
> ===================================================================
> --- linux-2.6.orig/mm/slub.c 2012-08-02 13:52:35.314898373 -0500
> +++ linux-2.6/mm/slub.c 2012-08-02 13:52:38.662958767 -0500
> @@ -2607,6 +2607,13 @@
>
> page = virt_to_head_page(x);
>
> + if (kmem_cache_debug(s) && page->slab != s) {
> + printk("kmem_cache_free: Wrong slab cache. %s but object"
> + " is from %s\n", page->slab->name, s->name);
> + WARN_ON(1);
> + return;
> + }
> +
This could quickly spam the kernel log depending on how frequently objects
are being freed from the buggy callsite, should we disable further
debugging for the cache in situations like this?
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next prev parent reply other threads:[~2012-08-02 20:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-02 20:15 Common [00/19] Sl[auo]b: Common code rework V9 Christoph Lameter
2012-08-02 20:15 ` Common [01/19] slub: Add debugging to verify correct cache use on kmem_cache_free() Christoph Lameter
2012-08-02 20:37 ` David Rientjes [this message]
2012-08-02 20:42 ` Christoph Lameter
2012-08-02 20:47 ` David Rientjes
2012-08-03 13:45 ` Christoph Lameter
2012-08-02 20:15 ` Common [02/19] slub: Use kmem_cache for the kmem_cache structure Christoph Lameter
2012-08-02 20:52 ` David Rientjes
2012-08-03 14:07 ` Christoph Lameter
2012-08-03 13:20 ` Glauber Costa
2012-08-03 13:52 ` Christoph Lameter
2012-08-03 13:53 ` Glauber Costa
2012-08-03 14:02 ` Christoph Lameter
2012-08-02 20:15 ` Common [03/19] Rename oops label Christoph Lameter
2012-08-02 20:45 ` David Rientjes
2012-08-02 20:15 ` Common [04/19] Improve error handling in kmem_cache_create Christoph Lameter
2012-08-02 20:58 ` David Rientjes
2012-08-02 20:15 ` Common [05/19] Move list_add() to slab_common.c Christoph Lameter
2012-08-02 21:18 ` David Rientjes
2012-08-02 20:15 ` Common [06/19] Extract a common function for kmem_cache_destroy Christoph Lameter
2012-08-02 20:15 ` Common [07/19] Always use the name "kmem_cache" for the slab cache with the kmem_cache structure Christoph Lameter
2012-08-02 20:15 ` Common [08/19] Move freeing of kmem_cache structure to common code Christoph Lameter
2012-08-02 20:15 ` Common [09/19] Get rid of __kmem_cache_destroy Christoph Lameter
2012-08-02 20:15 ` Common [10/19] Move duping of slab name to slab_common.c Christoph Lameter
2012-08-02 20:15 ` Common [11/19] Do slab aliasing call from common code Christoph Lameter
2012-08-02 20:15 ` Common [12/19] Move sysfs_slab_add to common Christoph Lameter
2012-08-02 20:15 ` Common [13/19] slub: Use a statically allocated kmem_cache boot structure for bootstrap Christoph Lameter
2012-08-02 20:15 ` Common [14/19] slub: Introduce function for opening boot caches Christoph Lameter
2012-08-02 20:15 ` Common [15/19] create common create_kmalloc_cache() Christoph Lameter
2012-08-02 20:15 ` Common [16/19] Move kmem_cache allocations into common code Christoph Lameter
2012-08-02 20:15 ` Common [17/19] Shrink __kmem_cache_create() parameter lists Christoph Lameter
2012-08-02 20:15 ` Common [18/19] Move kmem_cache refcounting to common code Christoph Lameter
2012-08-02 20:15 ` Common [19/19] Common alignment code Christoph Lameter
2012-08-03 13:09 ` Common [00/19] Sl[auo]b: Common code rework V9 Glauber Costa
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