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slub: enable tracking of full slabs 

If slab tracking is on then build a list of full slabs so that we can verify
the integrity of all slabs and are also able to built list of alloc/free
callers.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-05-06 14:49:42 -07:00 committed by Linus Torvalds
parent 77c5e2d01a
commit 643b113849
2 changed files with 41 additions and 1 deletions
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1
include/linux/slub_def.h
View File

@ -16,6 +16,7 @@ struct kmem_cache_node {
unsigned long nr_partial;
atomic_long_t nr_slabs;
struct list_head partial;
struct list_head full;
};
/*

41
mm/slub.c
View File

@ -661,6 +661,40 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
return search == NULL;
}
/*
* Tracking of fully allocated slabs for debugging
*/
static void add_full(struct kmem_cache *s, struct page *page)
{
struct kmem_cache_node *n;
VM_BUG_ON(!irqs_disabled());
VM_BUG_ON(!irqs_disabled());
if (!(s->flags & SLAB_STORE_USER))
return;
n = get_node(s, page_to_nid(page));
spin_lock(&n->list_lock);
list_add(&page->lru, &n->full);
spin_unlock(&n->list_lock);
}
static void remove_full(struct kmem_cache *s, struct page *page)
{
struct kmem_cache_node *n;
if (!(s->flags & SLAB_STORE_USER))
return;
n = get_node(s, page_to_nid(page));
spin_lock(&n->list_lock);
list_del(&page->lru);
spin_unlock(&n->list_lock);
}
static int alloc_object_checks(struct kmem_cache *s, struct page *page,
void *object)
{
@ -1090,6 +1124,8 @@ static void putback_slab(struct kmem_cache *s, struct page *page)
if (page->inuse) {
if (page->freelist)
add_partial(s, page);
else if (PageError(page))
add_full(s, page);
slab_unlock(page);
} else {
slab_unlock(page);
@ -1302,7 +1338,7 @@ out_unlock:
slab_empty:
if (prior)
/*
* Partially used slab that is on the partial list.
* Slab on the partial list.
*/
remove_partial(s, page);
@ -1314,6 +1350,8 @@ slab_empty:
debug:
if (!free_object_checks(s, page, x))
goto out_unlock;
if (!PageActive(page) && !page->freelist)
remove_full(s, page);
if (s->flags & SLAB_STORE_USER)
set_track(s, x, TRACK_FREE, addr);
goto checks_ok;
@ -1466,6 +1504,7 @@ static void init_kmem_cache_node(struct kmem_cache_node *n)
atomic_long_set(&n->nr_slabs, 0);
spin_lock_init(&n->list_lock);
INIT_LIST_HEAD(&n->partial);
INIT_LIST_HEAD(&n->full);
}
#ifdef CONFIG_NUMA