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Date: Mon, 22 Sep 2014 15:52:45 +0200
From: Michal Hocko <mhocko@...e.cz>
To: Vladimir Davydov <vdavydov@...allels.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Johannes Weiner <hannes@...xchg.org>,
Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 1/2] memcg: move memcg_{alloc,free}_cache_params to
slab_common.c
On Thu 18-09-14 19:50:19, Vladimir Davydov wrote:
> The only reason why they live in memcontrol.c is that we get/put css
> reference to the owner memory cgroup in them. However, we can do that in
> memcg_{un,}register_cache.
>
> So let's move them to slab_common.c and make them static.
Why is it better?
> Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: Christoph Lameter <cl@...ux.com>
> ---
> include/linux/memcontrol.h | 14 --------------
> mm/memcontrol.c | 41 ++++-------------------------------------
> mm/slab_common.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
> 3 files changed, 47 insertions(+), 52 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index e0752d204d9e..4d17242eeff7 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -440,10 +440,6 @@ void __memcg_kmem_uncharge_pages(struct page *page, int order);
>
> int memcg_cache_id(struct mem_cgroup *memcg);
>
> -int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
> - struct kmem_cache *root_cache);
> -void memcg_free_cache_params(struct kmem_cache *s);
> -
> int memcg_update_cache_size(struct kmem_cache *s, int num_groups);
> void memcg_update_array_size(int num_groups);
>
> @@ -574,16 +570,6 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
> return -1;
> }
>
> -static inline int memcg_alloc_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 struct kmem_cache *
> memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
> {
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 085dc6d2f876..b6bbb1e3e2ab 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2970,43 +2970,6 @@ int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
> return 0;
> }
>
> -int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
> - struct kmem_cache *root_cache)
> -{
> - size_t size;
> -
> - if (!memcg_kmem_enabled())
> - return 0;
> -
> - if (!memcg) {
> - size = offsetof(struct memcg_cache_params, memcg_caches);
> - size += memcg_limited_groups_array_size * sizeof(void *);
> - } else
> - size = sizeof(struct memcg_cache_params);
> -
> - s->memcg_params = kzalloc(size, GFP_KERNEL);
> - if (!s->memcg_params)
> - return -ENOMEM;
> -
> - if (memcg) {
> - s->memcg_params->memcg = memcg;
> - s->memcg_params->root_cache = root_cache;
> - css_get(&memcg->css);
> - } else
> - s->memcg_params->is_root_cache = true;
> -
> - return 0;
> -}
> -
> -void memcg_free_cache_params(struct kmem_cache *s)
> -{
> - if (!s->memcg_params)
> - return;
> - if (!s->memcg_params->is_root_cache)
> - css_put(&s->memcg_params->memcg->css);
> - kfree(s->memcg_params);
> -}
> -
> static void memcg_register_cache(struct mem_cgroup *memcg,
> struct kmem_cache *root_cache)
> {
> @@ -3037,6 +3000,7 @@ static void memcg_register_cache(struct mem_cgroup *memcg,
> if (!cachep)
> return;
>
> + css_get(&memcg->css);
> list_add(&cachep->memcg_params->list, &memcg->memcg_slab_caches);
>
> /*
> @@ -3070,6 +3034,9 @@ static void memcg_unregister_cache(struct kmem_cache *cachep)
> list_del(&cachep->memcg_params->list);
>
> kmem_cache_destroy(cachep);
> +
> + /* drop the reference taken in memcg_register_cache */
> + css_put(&memcg->css);
> }
>
> /*
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index d7d8ffd0c306..9c29ba792368 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -88,6 +88,38 @@ static inline int kmem_cache_sanity_check(const char *name, size_t size)
> #endif
>
> #ifdef CONFIG_MEMCG_KMEM
> +static int memcg_alloc_cache_params(struct mem_cgroup *memcg,
> + struct kmem_cache *s, struct kmem_cache *root_cache)
> +{
> + size_t size;
> +
> + if (!memcg_kmem_enabled())
> + return 0;
> +
> + if (!memcg) {
> + size = offsetof(struct memcg_cache_params, memcg_caches);
> + size += memcg_limited_groups_array_size * sizeof(void *);
> + } else
> + size = sizeof(struct memcg_cache_params);
> +
> + s->memcg_params = kzalloc(size, GFP_KERNEL);
> + if (!s->memcg_params)
> + return -ENOMEM;
> +
> + if (memcg) {
> + s->memcg_params->memcg = memcg;
> + s->memcg_params->root_cache = root_cache;
> + } else
> + s->memcg_params->is_root_cache = true;
> +
> + return 0;
> +}
> +
> +static void memcg_free_cache_params(struct kmem_cache *s)
> +{
> + kfree(s->memcg_params);
> +}
> +
> int memcg_update_all_caches(int num_memcgs)
> {
> struct kmem_cache *s;
> @@ -113,7 +145,17 @@ out:
> mutex_unlock(&slab_mutex);
> return ret;
> }
> -#endif
> +#else
> +static inline int memcg_alloc_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)
> +{
> +}
> +#endif /* CONFIG_MEMCG_KMEM */
>
> /*
> * Figure out what the alignment of the objects will be given a set of
> --
> 1.7.10.4
>
--
Michal Hocko
SUSE Labs
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