diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab.c | 1 | ||||
| -rw-r--r-- | mm/slub.c | 21 |
2 files changed, 18 insertions, 4 deletions
@@ -4099,6 +4099,7 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit, if ((ret < 0) || !is_root_cache(cachep)) return ret; + VM_BUG_ON(!mutex_is_locked(&slab_mutex)); for_each_memcg_cache_index(i) { c = cache_from_memcg(cachep, i); if (c) @@ -5108,12 +5108,25 @@ static ssize_t slab_attr_store(struct kobject *kobj, if (s->max_attr_size < len) s->max_attr_size = len; + /* + * This is a best effort propagation, so this function's return + * value will be determined by the parent cache only. This is + * basically because not all attributes will have a well + * defined semantics for rollbacks - most of the actions will + * have permanent effects. + * + * Returning the error value of any of the children that fail + * is not 100 % defined, in the sense that users seeing the + * error code won't be able to know anything about the state of + * the cache. + * + * Only returning the error code for the parent cache at least + * has well defined semantics. The cache being written to + * directly either failed or succeeded, in which case we loop + * through the descendants with best-effort propagation. + */ for_each_memcg_cache_index(i) { struct kmem_cache *c = cache_from_memcg(s, i); - /* - * This function's return value is determined by the - * parent cache only - */ if (c) attribute->store(c, buf, len); } |
