diff options
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/mm/slub.c b/mm/slub.c index 7fa27aee9b6e..06cdb1829dc9 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2007,6 +2007,7 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) int pages; int pobjects; + preempt_disable(); do { pages = 0; pobjects = 0; @@ -2040,6 +2041,14 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage); + if (unlikely(!s->cpu_partial)) { + unsigned long flags; + + local_irq_save(flags); + unfreeze_partials(s, this_cpu_ptr(s->cpu_slab)); + local_irq_restore(flags); + } + preempt_enable(); #endif } @@ -3369,7 +3378,7 @@ 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; @@ -3381,11 +3390,23 @@ 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. + */ + kick_all_cpus_sync(); + } + flush_all(s); for_each_kmem_cache_node(s, node, n) { - if (!n->nr_partial) - continue; - INIT_LIST_HEAD(&discard); for (i = 0; i < SHRINK_PROMOTE_MAX; i++) INIT_LIST_HEAD(promote + i); @@ -3440,7 +3461,7 @@ 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; |