From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <js1304@gmail.com>,
Glauber Costa <glommer@parallels.com>,
linux-mm@kvack.org, David Rientjes <rientjes@google.com>
Subject: C14 [01/14] [PATCH 10/28] slub: Add debugging to verify correct cache use on kmem_cache_free()
Date: Tue, 4 Sep 2012 23:06:14 +0000 [thread overview]
Message-ID: <000001399388b912-0f946031-9abd-4b99-8380-e6dd4d88341d-000000@email.amazonses.com> (raw)
In-Reply-To: <20120904230609.691088980@linux.com>
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.
V2: Only warn once.
Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
mm/slub.c | 7 +++++++
1 file changed, 7 insertions(+)
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c 2012-09-04 18:00:13.218025791 -0500
+++ linux/mm/slub.c 2012-09-04 18:02:00.947707104 -0500
@@ -2614,6 +2614,13 @@ void kmem_cache_free(struct kmem_cache *
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_ONCE(1);
+ return;
+ }
+
slab_free(s, page, x, _RET_IP_);
trace_kmem_cache_free(_RET_IP_, x);
--
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next prev parent reply other threads:[~2012-09-04 23:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20120904230609.691088980@linux.com>
2012-09-04 23:06 ` C14 [02/14] slub: Use kmem_cache for the kmem_cache structure Christoph Lameter
2012-09-04 23:06 ` Christoph Lameter [this message]
2012-09-04 23:18 ` C14 [05/14] Extract a common function for kmem_cache_destroy Christoph Lameter
2012-09-04 23:18 ` C14 [09/14] Move duping of slab name to slab_common.c Christoph Lameter
2012-09-04 23:18 ` C14 [13/14] Shrink __kmem_cache_create() parameter lists Christoph Lameter
2012-09-04 23:38 ` C14 [04/14] Move list_add() to slab_common.c Christoph Lameter
2012-09-04 23:38 ` C14 [08/14] Get rid of __kmem_cache_destroy Christoph Lameter
2012-09-04 23:38 ` C14 [14/14] [PATCH 23/28] Move kmem_cache refcounting to common code Christoph Lameter
2012-09-05 0:18 ` C14 [10/14] Do slab aliasing call from " Christoph Lameter
2012-09-05 0:18 ` C14 [11/14] Move sysfs_slab_add to common Christoph Lameter
2012-09-05 0:18 ` C14 [07/14] Move freeing of kmem_cache structure to common code Christoph Lameter
2012-09-05 0:20 ` C14 [06/14] Always use the name "kmem_cache" for the slab cache with the kmem_cache structure Christoph Lameter
2012-09-05 0:20 ` C14 [03/14] Improve error handling in kmem_cache_create Christoph Lameter
2012-09-05 0:20 ` C14 [12/14] Move kmem_cache allocations into common code Christoph Lameter
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