From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: linux-mm@kvack.org, David Rientjes <rientjes@google.com>,
Matt Mackall <mpm@selenic.com>,
Glauber Costa <glommer@parallels.com>,
Joonsoo Kim <js1304@gmail.com>
Subject: Common [1/9] slub: Add debugging to verify correct cache use on kmem_cache_free()
Date: Tue, 31 Jul 2012 12:36:21 -0500 [thread overview]
Message-ID: <20120731173634.162543139@linux.com> (raw)
In-Reply-To: 20120731173620.432853182@linux.com
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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>
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-07-31 11:46:01.544493395 -0500
+++ linux-2.6/mm/slub.c 2012-07-31 11:53:21.832078581 -0500
@@ -2583,6 +2583,13 @@
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;
+ }
+
slab_free(s, page, x, _RET_IP_);
trace_kmem_cache_free(_RET_IP_, x);
--
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next prev parent reply other threads:[~2012-07-31 17:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-31 17:36 Common [0/9] Sl[auo]b: Common code rework V7 Christoph Lameter
2012-07-31 17:36 ` Christoph Lameter [this message]
2012-07-31 17:36 ` Common [2/9] slub: Use kmem_cache for the kmem_cache structure Christoph Lameter
2012-08-01 8:42 ` Glauber Costa
2012-08-01 18:05 ` Christoph Lameter
2012-07-31 17:36 ` Common [3/9] Move list_add() to slab_common.c Christoph Lameter
2012-07-31 17:36 ` Common [4/9] Extract a common function for kmem_cache_destroy Christoph Lameter
2012-07-31 17:36 ` Common [5/9] Always use the name "kmem_cache" for the slab cache with the kmem_cache structure Christoph Lameter
2012-07-31 17:36 ` Common [6/9] Move freeing of kmem_cache structure to common code Christoph Lameter
2012-07-31 17:36 ` Common [7/9] Get rid of __kmem_cache_destroy Christoph Lameter
2012-07-31 17:36 ` Common [8/9] Move duping of slab name to slab_common.c Christoph Lameter
2012-07-31 18:02 ` Christoph Lameter
2012-07-31 17:36 ` Common [9/9] Do slab aliasing call from common code Christoph Lameter
2012-08-02 7:24 ` Glauber Costa
2012-08-02 13:57 ` Christoph Lameter
2012-08-02 13:58 ` Glauber Costa
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