From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: linux-mm@kvack.org, David Rientjes <rientjes@google.com>
Subject: [Slub cleanup 2/9] slub: Add frozen check in __slab_alloc
Date: Mon, 23 Jan 2012 14:16:48 -0600 [thread overview]
Message-ID: <20120123201706.547465637@linux.com> (raw)
In-Reply-To: 20120123201646.924319545@linux.com
[-- Attachment #1: frozen_check_in_slab_free --]
[-- Type: text/plain, Size: 1139 bytes --]
Verify that objects returned from __slab_alloc come from slab pages
in the correct state.
Signed-off-by: Christoph Lameter <cl@linux.com>
---
mm/slub.c | 6 ++++++
1 file changed, 6 insertions(+)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-01-13 08:47:07.498748874 -0600
+++ linux-2.6/mm/slub.c 2012-01-13 08:47:10.938748802 -0600
@@ -2220,6 +2220,12 @@ redo:
stat(s, ALLOC_REFILL);
load_freelist:
+ /*
+ * freelist is pointing to the list of objects to be used.
+ * page is pointing to the page from which the objects are obtained.
+ * That page must be frozen for per cpu allocations to work.
+ */
+ VM_BUG_ON(!c->page->frozen);
c->freelist = get_freepointer(s, freelist);
c->tid = next_tid(c->tid);
local_irq_restore(flags);
--
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next prev parent reply other threads:[~2012-01-23 20:17 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-23 20:16 [Slub cleanup 0/9] Slub: cleanups V1 Christoph Lameter
2012-01-23 20:16 ` [Slub cleanup 1/9] slub: Use freelist instead of "object" in __slab_alloc Christoph Lameter
2012-02-01 21:51 ` David Rientjes
2012-01-23 20:16 ` Christoph Lameter [this message]
2012-02-01 21:54 ` [Slub cleanup 2/9] slub: Add frozen check " David Rientjes
2012-01-23 20:16 ` [Slub cleanup 3/9] slub: Acquire_slab() avoid loop Christoph Lameter
2012-01-23 20:16 ` [Slub cleanup 4/9] slub: Simplify control flow in __slab_alloc() Christoph Lameter
2012-02-01 22:02 ` David Rientjes
2012-01-23 20:16 ` [Slub cleanup 6/9] slub: Get rid of the node field Christoph Lameter
2012-02-01 22:11 ` David Rientjes
2012-01-23 20:16 ` [Slub cleanup 7/9] slub: Separate out kmem_cache_cpu processing from deactivate_slab Christoph Lameter
2012-01-23 20:16 ` [Slub cleanup 8/9] slub: Use page variable instead of c->page Christoph Lameter
2012-01-23 20:16 ` [Slub cleanup 9/9] slub: pass page to node_match() instead of kmem_cache_cpu structure Christoph Lameter
[not found] ` <20120123201708.312262597@linux.com>
2012-02-01 22:05 ` [Slub cleanup 5/9] slub: new_slab_objects() can also get objects from partial list David Rientjes
-- strict thread matches above, loose matches on Subject: below --
2012-05-09 15:09 [Slub cleanup 0/9] Slub: cleanups V2 cl, Christoph Lameter
2012-05-09 15:09 ` [Slub cleanup 2/9] slub: Add frozen check in __slab_alloc cl, Christoph Lameter
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