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-rw-r--r--mm/slab.c4
-rw-r--r--mm/slab.h2
-rw-r--r--mm/slab_common.c27
-rw-r--r--mm/slob.c2
-rw-r--r--mm/slub.c19
5 files changed, 23 insertions, 31 deletions
diff --git a/mm/slab.c b/mm/slab.c
index be977ef6e718..8a0e3392f181 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2315,7 +2315,7 @@ out:
return nr_freed;
}
-int __kmem_cache_shrink(struct kmem_cache *cachep)
+int __kmem_cache_shrink(struct kmem_cache *cachep, bool deactivate)
{
int ret = 0;
int node;
@@ -2335,7 +2335,7 @@ int __kmem_cache_shrink(struct kmem_cache *cachep)
int __kmem_cache_shutdown(struct kmem_cache *cachep)
{
- return __kmem_cache_shrink(cachep);
+ return __kmem_cache_shrink(cachep, false);
}
void __kmem_cache_release(struct kmem_cache *cachep)
diff --git a/mm/slab.h b/mm/slab.h
index 2fa824335a50..d07563f37f33 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -167,7 +167,7 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
int __kmem_cache_shutdown(struct kmem_cache *);
void __kmem_cache_release(struct kmem_cache *);
-int __kmem_cache_shrink(struct kmem_cache *);
+int __kmem_cache_shrink(struct kmem_cache *, bool);
void slab_kmem_cache_release(struct kmem_cache *);
struct seq_file;
diff --git a/mm/slab_common.c b/mm/slab_common.c
index f266b0de1e92..4a999d749d2b 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -582,29 +582,6 @@ void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg)
get_online_cpus();
get_online_mems();
-#ifdef CONFIG_SLUB
- /*
- * In case of SLUB, we need to disable empty slab caching to
- * avoid pinning the offline memory cgroup by freeable kmem
- * pages charged to it. SLAB doesn't need this, as it
- * periodically purges unused slabs.
- */
- mutex_lock(&slab_mutex);
- list_for_each_entry(s, &slab_caches, list) {
- c = is_root_cache(s) ? cache_from_memcg_idx(s, idx) : NULL;
- if (c) {
- c->cpu_partial = 0;
- c->min_partial = 0;
- }
- }
- mutex_unlock(&slab_mutex);
- /*
- * kmem_cache->cpu_partial is checked locklessly (see
- * put_cpu_partial()). Make sure the change is visible.
- */
- synchronize_sched();
-#endif
-
mutex_lock(&slab_mutex);
list_for_each_entry(s, &slab_caches, list) {
if (!is_root_cache(s))
@@ -616,7 +593,7 @@ void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg)
if (!c)
continue;
- __kmem_cache_shrink(c);
+ __kmem_cache_shrink(c, true);
arr->entries[idx] = NULL;
}
mutex_unlock(&slab_mutex);
@@ -787,7 +764,7 @@ int kmem_cache_shrink(struct kmem_cache *cachep)
get_online_cpus();
get_online_mems();
kasan_cache_shrink(cachep);
- ret = __kmem_cache_shrink(cachep);
+ ret = __kmem_cache_shrink(cachep, false);
put_online_mems();
put_online_cpus();
return ret;
diff --git a/mm/slob.c b/mm/slob.c
index eac04d4357ec..5ec158054ffe 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -634,7 +634,7 @@ void __kmem_cache_release(struct kmem_cache *c)
{
}
-int __kmem_cache_shrink(struct kmem_cache *d)
+int __kmem_cache_shrink(struct kmem_cache *d, bool deactivate)
{
return 0;
}
diff --git a/mm/slub.c b/mm/slub.c
index 1e5ef312f146..6de08005d9cd 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3891,7 +3891,7 @@ EXPORT_SYMBOL(kfree);
* being allocated from last increasing the chance that the last objects
* are freed in them.
*/
-int __kmem_cache_shrink(struct kmem_cache *s)
+int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate)
{
int node;
int i;
@@ -3903,6 +3903,21 @@ int __kmem_cache_shrink(struct kmem_cache *s)
unsigned long flags;
int ret = 0;
+ if (deactivate) {
+ /*
+ * Disable empty slabs caching. Used to avoid pinning offline
+ * memory cgroups by kmem pages that can be freed.
+ */
+ s->cpu_partial = 0;
+ s->min_partial = 0;
+
+ /*
+ * s->cpu_partial is checked locklessly (see put_cpu_partial),
+ * so we have to make sure the change is visible.
+ */
+ synchronize_sched();
+ }
+
flush_all(s);
for_each_kmem_cache_node(s, node, n) {
INIT_LIST_HEAD(&discard);
@@ -3959,7 +3974,7 @@ static int slab_mem_going_offline_callback(void *arg)
mutex_lock(&slab_mutex);
list_for_each_entry(s, &slab_caches, list)
- __kmem_cache_shrink(s);
+ __kmem_cache_shrink(s, false);
mutex_unlock(&slab_mutex);
return 0;

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