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authorVladimir Davydov <vdavydov@parallels.com>2014-01-23 15:52:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:51 -0800
commit1aa13254259bdef0bca723849ab3bab308d2f0c3 (patch)
tree4d2207788bf99f908ffed696f9d58c96eaf0b8b0 /mm/slab_common.c
parent363a044f739b0f07a8c063b838c5528d10720e02 (diff)
downloadop-kernel-dev-1aa13254259bdef0bca723849ab3bab308d2f0c3.zip
op-kernel-dev-1aa13254259bdef0bca723849ab3bab308d2f0c3.tar.gz
memcg, slab: clean up memcg cache initialization/destruction
Currently, we have rather a messy function set relating to per-memcg kmem cache initialization/destruction. Per-memcg caches are created in memcg_create_kmem_cache(). This function calls kmem_cache_create_memcg() to allocate and initialize a kmem cache and then "registers" the new cache in the memcg_params::memcg_caches array of the parent cache. During its work-flow, kmem_cache_create_memcg() executes the following memcg-related functions: - memcg_alloc_cache_params(), to initialize memcg_params of the newly created cache; - memcg_cache_list_add(), to add the new cache to the memcg_slab_caches list. On the other hand, kmem_cache_destroy() called on a cache destruction only calls memcg_release_cache(), which does all the work: it cleans the reference to the cache in its parent's memcg_params::memcg_caches, removes the cache from the memcg_slab_caches list, and frees memcg_params. Such an inconsistency between destruction and initialization paths make the code difficult to read, so let's clean this up a bit. This patch moves all the code relating to registration of per-memcg caches (adding to memcg list, setting the pointer to a cache from its parent) to the newly created memcg_register_cache() and memcg_unregister_cache() functions making the initialization and destruction paths look symmetrical. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Glauber Costa <glommer@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Balbir Singh <bsingharora@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 70f9e24..db24ec4 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -215,7 +215,7 @@ kmem_cache_create_memcg(struct mem_cgroup *memcg, const char *name, size_t size,
s->refcount = 1;
list_add(&s->list, &slab_caches);
- memcg_cache_list_add(memcg, s);
+ memcg_register_cache(s);
out_unlock:
mutex_unlock(&slab_mutex);
@@ -265,7 +265,8 @@ void kmem_cache_destroy(struct kmem_cache *s)
if (s->flags & SLAB_DESTROY_BY_RCU)
rcu_barrier();
- memcg_release_cache(s);
+ memcg_unregister_cache(s);
+ memcg_free_cache_params(s);
kfree(s->name);
kmem_cache_free(kmem_cache, s);
} else {
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