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Date: Wed, 14 May 2014 11:40:12 +0200
From: Michal Hocko <mhocko@...e.cz>
To: Vladimir Davydov <vdavydov@...allels.com>
Cc: akpm@...ux-foundation.org, hannes@...xchg.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -mm v2] memcg: cleanup kmem cache creation/destruction
functions naming
On Tue 13-05-14 19:05:51, Vladimir Davydov wrote:
> Current names are rather inconsistent. Let's try to improve them.
>
> Brief change log:
>
> ** old name ** ** new name **
>
> kmem_cache_create_memcg memcg_create_kmem_cache
> memcg_kmem_create_cache memcg_regsiter_cache
> memcg_kmem_destroy_cache memcg_unregister_cache
>
> kmem_cache_destroy_memcg_children memcg_cleanup_cache_params
> mem_cgroup_destroy_all_caches memcg_unregister_all_caches
>
> create_work memcg_register_cache_work
> memcg_create_cache_work_func memcg_register_cache_func
> memcg_create_cache_enqueue memcg_schedule_register_cache
>
> Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
Acked-by: Michal Hocko <mhocko@...e.cz>
Thanks!
> ---
> include/linux/memcontrol.h | 2 +-
> include/linux/slab.h | 2 +-
> mm/memcontrol.c | 60 +++++++++++++++++++++-----------------------
> mm/slab_common.c | 12 ++++-----
> 4 files changed, 36 insertions(+), 40 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index aa429de275cc..c3a53cbb88eb 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -514,7 +514,7 @@ __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
> int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order);
> void __memcg_uncharge_slab(struct kmem_cache *cachep, int order);
>
> -int __kmem_cache_destroy_memcg_children(struct kmem_cache *s);
> +int __memcg_cleanup_cache_params(struct kmem_cache *s);
>
> /**
> * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 86e5b26fbdab..1d9abb7d22a0 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -116,7 +116,7 @@ struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
> unsigned long,
> void (*)(void *));
> #ifdef CONFIG_MEMCG_KMEM
> -struct kmem_cache *kmem_cache_create_memcg(struct mem_cgroup *,
> +struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *,
> struct kmem_cache *,
> const char *);
> #endif
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index f5ea266f4d9a..b12a05049f2a 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3127,8 +3127,8 @@ void memcg_free_cache_params(struct kmem_cache *s)
> kfree(s->memcg_params);
> }
>
> -static void memcg_kmem_create_cache(struct mem_cgroup *memcg,
> - struct kmem_cache *root_cache)
> +static void memcg_register_cache(struct mem_cgroup *memcg,
> + struct kmem_cache *root_cache)
> {
> static char memcg_name_buf[NAME_MAX + 1]; /* protected by
> memcg_slab_mutex */
> @@ -3148,7 +3148,7 @@ static void memcg_kmem_create_cache(struct mem_cgroup *memcg,
> return;
>
> cgroup_name(memcg->css.cgroup, memcg_name_buf, NAME_MAX + 1);
> - cachep = kmem_cache_create_memcg(memcg, root_cache, memcg_name_buf);
> + cachep = memcg_create_kmem_cache(memcg, root_cache, memcg_name_buf);
> /*
> * If we could not create a memcg cache, do not complain, because
> * that's not critical at all as we can always proceed with the root
> @@ -3170,7 +3170,7 @@ static void memcg_kmem_create_cache(struct mem_cgroup *memcg,
> root_cache->memcg_params->memcg_caches[id] = cachep;
> }
>
> -static void memcg_kmem_destroy_cache(struct kmem_cache *cachep)
> +static void memcg_unregister_cache(struct kmem_cache *cachep)
> {
> struct kmem_cache *root_cache;
> struct mem_cgroup *memcg;
> @@ -3223,7 +3223,7 @@ static inline void memcg_resume_kmem_account(void)
> current->memcg_kmem_skip_account--;
> }
>
> -int __kmem_cache_destroy_memcg_children(struct kmem_cache *s)
> +int __memcg_cleanup_cache_params(struct kmem_cache *s)
> {
> struct kmem_cache *c;
> int i, failed = 0;
> @@ -3234,7 +3234,7 @@ int __kmem_cache_destroy_memcg_children(struct kmem_cache *s)
> if (!c)
> continue;
>
> - memcg_kmem_destroy_cache(c);
> + memcg_unregister_cache(c);
>
> if (cache_from_memcg_idx(s, i))
> failed++;
> @@ -3243,7 +3243,7 @@ int __kmem_cache_destroy_memcg_children(struct kmem_cache *s)
> return failed;
> }
>
> -static void mem_cgroup_destroy_all_caches(struct mem_cgroup *memcg)
> +static void memcg_unregister_all_caches(struct mem_cgroup *memcg)
> {
> struct kmem_cache *cachep;
> struct memcg_cache_params *params, *tmp;
> @@ -3256,25 +3256,26 @@ static void mem_cgroup_destroy_all_caches(struct mem_cgroup *memcg)
> cachep = memcg_params_to_cache(params);
> kmem_cache_shrink(cachep);
> if (atomic_read(&cachep->memcg_params->nr_pages) == 0)
> - memcg_kmem_destroy_cache(cachep);
> + memcg_unregister_cache(cachep);
> }
> mutex_unlock(&memcg_slab_mutex);
> }
>
> -struct create_work {
> +struct memcg_register_cache_work {
> struct mem_cgroup *memcg;
> struct kmem_cache *cachep;
> struct work_struct work;
> };
>
> -static void memcg_create_cache_work_func(struct work_struct *w)
> +static void memcg_register_cache_func(struct work_struct *w)
> {
> - struct create_work *cw = container_of(w, struct create_work, work);
> + struct memcg_register_cache_work *cw =
> + container_of(w, struct memcg_register_cache_work, work);
> struct mem_cgroup *memcg = cw->memcg;
> struct kmem_cache *cachep = cw->cachep;
>
> mutex_lock(&memcg_slab_mutex);
> - memcg_kmem_create_cache(memcg, cachep);
> + memcg_register_cache(memcg, cachep);
> mutex_unlock(&memcg_slab_mutex);
>
> css_put(&memcg->css);
> @@ -3284,12 +3285,12 @@ static void memcg_create_cache_work_func(struct work_struct *w)
> /*
> * Enqueue the creation of a per-memcg kmem_cache.
> */
> -static void __memcg_create_cache_enqueue(struct mem_cgroup *memcg,
> - struct kmem_cache *cachep)
> +static void __memcg_schedule_register_cache(struct mem_cgroup *memcg,
> + struct kmem_cache *cachep)
> {
> - struct create_work *cw;
> + struct memcg_register_cache_work *cw;
>
> - cw = kmalloc(sizeof(struct create_work), GFP_NOWAIT);
> + cw = kmalloc(sizeof(*cw), GFP_NOWAIT);
> if (cw == NULL) {
> css_put(&memcg->css);
> return;
> @@ -3298,17 +3299,17 @@ static void __memcg_create_cache_enqueue(struct mem_cgroup *memcg,
> cw->memcg = memcg;
> cw->cachep = cachep;
>
> - INIT_WORK(&cw->work, memcg_create_cache_work_func);
> + INIT_WORK(&cw->work, memcg_register_cache_func);
> schedule_work(&cw->work);
> }
>
> -static void memcg_create_cache_enqueue(struct mem_cgroup *memcg,
> - struct kmem_cache *cachep)
> +static void memcg_schedule_register_cache(struct mem_cgroup *memcg,
> + struct kmem_cache *cachep)
> {
> /*
> * We need to stop accounting when we kmalloc, because if the
> * corresponding kmalloc cache is not yet created, the first allocation
> - * in __memcg_create_cache_enqueue will recurse.
> + * in __memcg_schedule_register_cache will recurse.
> *
> * However, it is better to enclose the whole function. Depending on
> * the debugging options enabled, INIT_WORK(), for instance, can
> @@ -3317,7 +3318,7 @@ static void memcg_create_cache_enqueue(struct mem_cgroup *memcg,
> * the safest choice is to do it like this, wrapping the whole function.
> */
> memcg_stop_kmem_account();
> - __memcg_create_cache_enqueue(memcg, cachep);
> + __memcg_schedule_register_cache(memcg, cachep);
> memcg_resume_kmem_account();
> }
>
> @@ -3388,16 +3389,11 @@ struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep,
> *
> * However, there are some clashes that can arrive from locking.
> * For instance, because we acquire the slab_mutex while doing
> - * kmem_cache_dup, this means no further allocation could happen
> - * with the slab_mutex held.
> - *
> - * Also, because cache creation issue get_online_cpus(), this
> - * creates a lock chain: memcg_slab_mutex -> cpu_hotplug_mutex,
> - * that ends up reversed during cpu hotplug. (cpuset allocates
> - * a bunch of GFP_KERNEL memory during cpuup). Due to all that,
> - * better to defer everything.
> + * memcg_create_kmem_cache, this means no further allocation
> + * could happen with the slab_mutex held. So it's better to
> + * defer everything.
> */
> - memcg_create_cache_enqueue(memcg, cachep);
> + memcg_schedule_register_cache(memcg, cachep);
> return cachep;
> out:
> rcu_read_unlock();
> @@ -3521,7 +3517,7 @@ void __memcg_kmem_uncharge_pages(struct page *page, int order)
> memcg_uncharge_kmem(memcg, PAGE_SIZE << order);
> }
> #else
> -static inline void mem_cgroup_destroy_all_caches(struct mem_cgroup *memcg)
> +static inline void memcg_unregister_all_caches(struct mem_cgroup *memcg)
> {
> }
> #endif /* CONFIG_MEMCG_KMEM */
> @@ -6399,7 +6395,7 @@ static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
> css_for_each_descendant_post(iter, css)
> mem_cgroup_reparent_charges(mem_cgroup_from_css(iter));
>
> - mem_cgroup_destroy_all_caches(memcg);
> + memcg_unregister_all_caches(memcg);
> vmpressure_cleanup(&memcg->vmpressure);
> }
>
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index 32175617cb75..48fafb61f35e 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -261,7 +261,7 @@ EXPORT_SYMBOL(kmem_cache_create);
>
> #ifdef CONFIG_MEMCG_KMEM
> /*
> - * kmem_cache_create_memcg - Create a cache for a memory cgroup.
> + * memcg_create_kmem_cache - Create a cache for a memory cgroup.
> * @memcg: The memory cgroup the new cache is for.
> * @root_cache: The parent of the new cache.
> * @memcg_name: The name of the memory cgroup (used for naming the new cache).
> @@ -270,7 +270,7 @@ EXPORT_SYMBOL(kmem_cache_create);
> * requests going from @memcg to @root_cache. The new cache inherits properties
> * from its parent.
> */
> -struct kmem_cache *kmem_cache_create_memcg(struct mem_cgroup *memcg,
> +struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
> struct kmem_cache *root_cache,
> const char *memcg_name)
> {
> @@ -305,7 +305,7 @@ out_unlock:
> return s;
> }
>
> -static int kmem_cache_destroy_memcg_children(struct kmem_cache *s)
> +static int memcg_cleanup_cache_params(struct kmem_cache *s)
> {
> int rc;
>
> @@ -314,13 +314,13 @@ static int kmem_cache_destroy_memcg_children(struct kmem_cache *s)
> return 0;
>
> mutex_unlock(&slab_mutex);
> - rc = __kmem_cache_destroy_memcg_children(s);
> + rc = __memcg_cleanup_cache_params(s);
> mutex_lock(&slab_mutex);
>
> return rc;
> }
> #else
> -static int kmem_cache_destroy_memcg_children(struct kmem_cache *s)
> +static int memcg_cleanup_cache_params(struct kmem_cache *s)
> {
> return 0;
> }
> @@ -343,7 +343,7 @@ void kmem_cache_destroy(struct kmem_cache *s)
> if (s->refcount)
> goto out_unlock;
>
> - if (kmem_cache_destroy_memcg_children(s) != 0)
> + if (memcg_cleanup_cache_params(s) != 0)
> goto out_unlock;
>
> list_del(&s->list);
> --
> 1.7.10.4
>
--
Michal Hocko
SUSE Labs
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