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Date: Wed, 9 Apr 2014 19:02:33 +0400
From: Vladimir Davydov <vdavydov@...allels.com>
To: <akpm@...ux-foundation.org>
CC: <mhocko@...e.cz>, <hannes@...xchg.org>, <glommer@...il.com>,
<cl@...ux-foundation.org>, <penberg@...nel.org>,
<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
<devel@...nvz.org>
Subject: [PATCH -mm 4/4] memcg, slab: remove memcg_cache_params::destroy work
There is no need to schedule a work for kmem_cache_shrink/destroy from
mem_cgroup_destroy_all_caches any more, because we can now call them
directly under memcg's slab_caches_mutex.
Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
include/linux/slab.h | 3 ---
mm/memcontrol.c | 45 +++++++++++++++++----------------------------
2 files changed, 17 insertions(+), 31 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 22ebcf475814..5b48ef7c0cea 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -515,8 +515,6 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
* @list: list_head for the list of all caches in this memcg
* @root_cache: pointer to the global, root cache, this cache was derived from
* @nr_pages: number of pages that belongs to this cache.
- * @destroy: worker to be called whenever we are ready, or believe we may be
- * ready, to destroy this cache.
*/
struct memcg_cache_params {
bool is_root_cache;
@@ -530,7 +528,6 @@ struct memcg_cache_params {
struct list_head list;
struct kmem_cache *root_cache;
atomic_t nr_pages;
- struct work_struct destroy;
};
};
};
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9621157f2e5b..443a5ff0d923 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3040,8 +3040,6 @@ void memcg_update_array_size(int num)
memcg_limited_groups_array_size = memcg_caches_array_size(num);
}
-static void kmem_cache_destroy_work_func(struct work_struct *w);
-
int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
{
struct memcg_cache_params *cur_params = s->memcg_params;
@@ -3138,8 +3136,6 @@ int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
if (memcg) {
s->memcg_params->memcg = memcg;
s->memcg_params->root_cache = root_cache;
- INIT_WORK(&s->memcg_params->destroy,
- kmem_cache_destroy_work_func);
css_get(&memcg->css);
} else
s->memcg_params->is_root_cache = true;
@@ -3203,7 +3199,7 @@ out:
mutex_unlock(&memcg->slab_caches_mutex);
}
-static void memcg_kmem_destroy_cache(struct kmem_cache *cachep)
+static void __memcg_kmem_destroy_cache(struct kmem_cache *cachep)
{
struct kmem_cache *root_cache;
struct mem_cgroup *memcg;
@@ -3215,7 +3211,7 @@ static void memcg_kmem_destroy_cache(struct kmem_cache *cachep)
memcg = cachep->memcg_params->memcg;
id = memcg_cache_id(memcg);
- mutex_lock(&memcg->slab_caches_mutex);
+ lockdep_assert_held(&memcg->slab_caches_mutex);
/*
* Holding the activate_kmem_mutex assures nobody will touch the
@@ -3229,7 +3225,17 @@ static void memcg_kmem_destroy_cache(struct kmem_cache *cachep)
list_del(&cachep->memcg_params->list);
kmem_cache_destroy(cachep);
+}
+
+static void memcg_kmem_destroy_cache(struct kmem_cache *cachep)
+{
+ struct mem_cgroup *memcg;
+
+ BUG_ON(is_root_cache(cachep));
+ memcg = cachep->memcg_params->memcg;
+ mutex_lock(&memcg->slab_caches_mutex);
+ __memcg_kmem_destroy_cache(cachep);
mutex_unlock(&memcg->slab_caches_mutex);
}
@@ -3264,19 +3270,6 @@ static inline void memcg_resume_kmem_account(void)
current->memcg_kmem_skip_account--;
}
-static void kmem_cache_destroy_work_func(struct work_struct *w)
-{
- struct kmem_cache *cachep;
- struct memcg_cache_params *p;
-
- p = container_of(w, struct memcg_cache_params, destroy);
- cachep = memcg_params_to_cache(p);
-
- kmem_cache_shrink(cachep);
- if (atomic_read(&cachep->memcg_params->nr_pages) == 0)
- memcg_kmem_destroy_cache(cachep);
-}
-
int __kmem_cache_destroy_memcg_children(struct kmem_cache *s)
{
struct kmem_cache *c;
@@ -3298,12 +3291,6 @@ int __kmem_cache_destroy_memcg_children(struct kmem_cache *s)
if (!c)
continue;
- /*
- * We will now manually delete the caches, so to avoid races
- * we need to cancel all pending destruction workers and
- * proceed with destruction ourselves.
- */
- cancel_work_sync(&c->memcg_params->destroy);
memcg_kmem_destroy_cache(c);
if (cache_from_memcg_idx(s, i))
@@ -3316,15 +3303,17 @@ int __kmem_cache_destroy_memcg_children(struct kmem_cache *s)
static void mem_cgroup_destroy_all_caches(struct mem_cgroup *memcg)
{
struct kmem_cache *cachep;
- struct memcg_cache_params *params;
+ struct memcg_cache_params *params, *tmp;
if (!memcg_kmem_is_active(memcg))
return;
mutex_lock(&memcg->slab_caches_mutex);
- list_for_each_entry(params, &memcg->memcg_slab_caches, list) {
+ list_for_each_entry_safe(params, tmp, &memcg->memcg_slab_caches, list) {
cachep = memcg_params_to_cache(params);
- schedule_work(&cachep->memcg_params->destroy);
+ kmem_cache_shrink(cachep);
+ if (atomic_read(&cachep->memcg_params->nr_pages) == 0)
+ __memcg_kmem_destroy_cache(cachep);
}
mutex_unlock(&memcg->slab_caches_mutex);
}
--
1.7.10.4
--
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