On Wed 18-12-13 17:16:53, Vladimir Davydov wrote:
> Plus, rename memcg_register_cache() to memcg_init_cache_params(),
> because it actually does not register the cache anywhere, but simply
> initialize kmem_cache::memcg_params.
I've almost missed this is a memory leak fix.
I do not mind renaming and the name but wouldn't
memcg_alloc_cache_params suit better?
> Signed-off-by: Vladimir Davydov <vdavy...@parallels.com>
> Cc: Michal Hocko <mho...@suse.cz>
> Cc: Johannes Weiner <han...@cmpxchg.org>
> Cc: Glauber Costa <glom...@gmail.com>
> Cc: Christoph Lameter <c...@linux.com>
> Cc: Pekka Enberg <penb...@kernel.org>
> Cc: Andrew Morton <a...@linux-foundation.org>
> ---
> include/linux/memcontrol.h | 13 +++++++++----
> mm/memcontrol.c | 9 +++++++--
> mm/slab_common.c | 3 ++-
> 3 files changed, 18 insertions(+), 7 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index b3e7a66..b357ae3 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -497,8 +497,9 @@ void __memcg_kmem_commit_charge(struct page *page,
> void __memcg_kmem_uncharge_pages(struct page *page, int order);
>
> int memcg_cache_id(struct mem_cgroup *memcg);
> -int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
> - struct kmem_cache *root_cache);
> +int memcg_init_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
> + struct kmem_cache *root_cache);
> +void memcg_free_cache_params(struct kmem_cache *s);
> void memcg_release_cache(struct kmem_cache *cachep);
> void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache
> *cachep);
>
> @@ -641,12 +642,16 @@ static inline int memcg_cache_id(struct mem_cgroup
> *memcg)
> }
>
> static inline int
> -memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
> - struct kmem_cache *root_cache)
> +memcg_init_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
> + struct kmem_cache *root_cache)
> {
> return 0;
> }
>
> +static inline void memcg_free_cache_params(struct kmem_cache *s);
> +{
> +}
> +
> static inline void memcg_release_cache(struct kmem_cache *cachep)
> {
> }
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index bf5e894..e6ad6ff 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3195,8 +3195,8 @@ int memcg_update_cache_size(struct kmem_cache *s, int
> num_groups)
> return 0;
> }
>
> -int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
> - struct kmem_cache *root_cache)
> +int memcg_init_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
> + struct kmem_cache *root_cache)
> {
> size_t size;
>
> @@ -3224,6 +3224,11 @@ int memcg_register_cache(struct mem_cgroup *memcg,
> struct kmem_cache *s,
> return 0;
> }
>
> +void memcg_free_cache_params(struct kmem_cache *s)
> +{
> + kfree(s->memcg_params);
> +}
> +
> void memcg_release_cache(struct kmem_cache *s)
> {
> struct kmem_cache *root;
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index 5d6f743..62712fe 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -208,7 +208,7 @@ kmem_cache_create_memcg(struct mem_cgroup *memcg, const
> char *name, size_t size,
> goto out_free_cache;
> }
>
> - err = memcg_register_cache(memcg, s, parent_cache);
> + err = memcg_init_cache_params(memcg, s, parent_cache);
> if (err)
> goto out_free_cache;
>
> @@ -238,6 +238,7 @@ out_unlock:
> return s;
>
> out_free_cache:
> + memcg_free_cache_params(s);
> kfree(s->name);
> kmem_cache_free(kmem_cache, s);
> goto out_unlock;
> --
> 1.7.10.4
>
--
Michal Hocko
SUSE Labs
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