On 12/18/2013 09:06 PM, Michal Hocko wrote:
> 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.
Yeah, the comment is poor, sorry about that. Will fix it.
> I do not mind renaming and the name but wouldn't
> memcg_alloc_cache_params suit better?
As you wish. I don't have a strong preference for memcg_init_cache_params.
Thanks.
>
>> Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
>> Cc: Michal Hocko <mhocko@xxxxxxx>
>> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
>> Cc: Glauber Costa <glommer@xxxxxxxxx>
>> Cc: Christoph Lameter <cl@xxxxxxxxx>
>> Cc: Pekka Enberg <penberg@xxxxxxxxxx>
>> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>> ---
>> 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
>>
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