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slub: Dump list of objects not freed on kmem_cache_close() 

Dump a list of unfreed objects if a slab cache is closed but
objects still remain.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Christoph Lameter 2008-04-25 12:22:43 -07:00 committed by Pekka Enberg
parent 599870b175
commit 33b12c3813
1 changed files with 31 additions and 1 deletions
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32
mm/slub.c
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@ -2371,6 +2371,32 @@ const char *kmem_cache_name(struct kmem_cache *s)
} }
EXPORT_SYMBOL(kmem_cache_name); EXPORT_SYMBOL(kmem_cache_name);
static void list_slab_objects(struct kmem_cache *s, struct page *page,
const char *text)
{
#ifdef CONFIG_SLUB_DEBUG
void *addr = page_address(page);
void *p;
DECLARE_BITMAP(map, page->objects);
bitmap_zero(map, page->objects);
slab_err(s, page, "%s", text);
slab_lock(page);
for_each_free_object(p, s, page->freelist)
set_bit(slab_index(p, s, addr), map);
for_each_object(p, s, addr, page->objects) {
if (!test_bit(slab_index(p, s, addr), map)) {
printk(KERN_ERR "INFO: Object 0x%p @offset=%tu\n",
p, p - addr);
print_tracking(s, p);
}
}
slab_unlock(page);
#endif
}
/* /*
* Attempt to free all partial slabs on a node. * Attempt to free all partial slabs on a node.
*/ */
@ -2380,12 +2406,16 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
struct page *page, *h; struct page *page, *h;
spin_lock_irqsave(&n->list_lock, flags); spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry_safe(page, h, &n->partial, lru) list_for_each_entry_safe(page, h, &n->partial, lru) {
if (!page->inuse) { if (!page->inuse) {
list_del(&page->lru); list_del(&page->lru);
discard_slab(s, page); discard_slab(s, page);
n->nr_partial--; n->nr_partial--;
} else {
list_slab_objects(s, page,
"Objects remaining on kmem_cache_close()");
} }
}
spin_unlock_irqrestore(&n->list_lock, flags); spin_unlock_irqrestore(&n->list_lock, flags);
} }