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mm, slub: allocate private object map for validate_slab_cache() 

validate_slab_cache() is called either to handle a sysfs write, or from a
self-test context. In both situations it's straightforward to preallocate a
private object bitmap instead of grabbing the shared static one meant for
critical sections, so let's do that.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
This commit is contained in:
Vlastimil Babka 2021-05-23 01:37:07 +02:00
parent b3fd64e145
commit 0a19e7dd92
1 changed files with 15 additions and 9 deletions
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24
mm/slub.c
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@ -4679,11 +4679,11 @@ static int count_total(struct page *page)
#endif
#ifdef CONFIG_SLUB_DEBUG
static void validate_slab(struct kmem_cache *s, struct page *page)
static void validate_slab(struct kmem_cache *s, struct page *page,
unsigned long *obj_map)
{
void *p;
void *addr = page_address(page);
unsigned long *map;
slab_lock(page);
@ -4691,21 +4691,20 @@ static void validate_slab(struct kmem_cache *s, struct page *page)
goto unlock;
/* Now we know that a valid freelist exists */
map = get_map(s, page);
__fill_map(obj_map, s, page);
for_each_object(p, s, addr, page->objects) {
u8 val = test_bit(__obj_to_index(s, addr, p), map) ?
u8 val = test_bit(__obj_to_index(s, addr, p), obj_map) ?
SLUB_RED_INACTIVE : SLUB_RED_ACTIVE;
if (!check_object(s, page, p, val))
break;
}
put_map(map);
unlock:
slab_unlock(page);
}
static int validate_slab_node(struct kmem_cache *s,
struct kmem_cache_node *n)
struct kmem_cache_node *n, unsigned long *obj_map)
{
unsigned long count = 0;
struct page *page;
@ -4714,7 +4713,7 @@ static int validate_slab_node(struct kmem_cache *s,
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, slab_list) {
validate_slab(s, page);
validate_slab(s, page, obj_map);
count++;
}
if (count != n->nr_partial) {
@ -4727,7 +4726,7 @@ static int validate_slab_node(struct kmem_cache *s,
goto out;
list_for_each_entry(page, &n->full, slab_list) {
validate_slab(s, page);
validate_slab(s, page, obj_map);
count++;
}
if (count != atomic_long_read(&n->nr_slabs)) {
@ -4746,10 +4745,17 @@ long validate_slab_cache(struct kmem_cache *s)
int node;
unsigned long count = 0;
struct kmem_cache_node *n;
unsigned long *obj_map;
obj_map = bitmap_alloc(oo_objects(s->oo), GFP_KERNEL);
if (!obj_map)
return -ENOMEM;
flush_all(s);
for_each_kmem_cache_node(s, node, n)
count += validate_slab_node(s, n);
count += validate_slab_node(s, n, obj_map);
bitmap_free(obj_map);
return count;
}