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authorVladimir Davydov <vdavydov@virtuozzo.com>2015-11-05 18:45:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 19:34:48 -0800
commitcd918c557439c8f0750f64883367aeff264b5fd8 (patch)
tree72487956b6483041f2591c42898909f3a75b4f1b
parentd60fdcc9e3febde2ebd49fe517e13f428bc12843 (diff)
mm/slab_common.c: do not warn that cache is busy on destroy more than once
Currently, when kmem_cache_destroy() is called for a global cache, we print a warning for each per memcg cache attached to it that has active objects (see shutdown_cache). This is redundant, because it gives no new information and only clutters the log. If a cache being destroyed has active objects, there must be a memory leak in the module that created the cache, and it does not matter if the cache was used by users in memory cgroups or not. This patch moves the warning from shutdown_cache(), which is called for shutting down both global and per memcg caches, to kmem_cache_destroy(), so that the warning is only printed once if there are objects left in the cache being destroyed. Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab_common.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index ab1f20e303e4..fba78e4a6643 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -451,12 +451,8 @@ EXPORT_SYMBOL(kmem_cache_create);
static int shutdown_cache(struct kmem_cache *s,
struct list_head *release, bool *need_rcu_barrier)
{
- if (__kmem_cache_shutdown(s) != 0) {
- printk(KERN_ERR "kmem_cache_destroy %s: "
- "Slab cache still has objects\n", s->name);
- dump_stack();
+ if (__kmem_cache_shutdown(s) != 0)
return -EBUSY;
- }
if (s->flags & SLAB_DESTROY_BY_RCU)
*need_rcu_barrier = true;
@@ -722,8 +718,13 @@ void kmem_cache_destroy(struct kmem_cache *s)
err = shutdown_memcg_caches(s, &release, &need_rcu_barrier);
if (!err)
- shutdown_cache(s, &release, &need_rcu_barrier);
+ err = shutdown_cache(s, &release, &need_rcu_barrier);
+ if (err) {
+ pr_err("kmem_cache_destroy %s: "
+ "Slab cache still has objects\n", s->name);
+ dump_stack();
+ }
out_unlock:
mutex_unlock(&slab_mutex);