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authorVladimir Davydov <vdavydov@parallels.com>2014-10-09 15:28:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-09 22:25:59 -0400
commit6f817f4cda68b09621312ec5ba84217bc5e37b3d (patch)
tree3c91b99f42ee347dfc4106f7c04786d0d46f0694 /mm
parentf3bb3043a092368a255bca5d1c6f4352c96a3b2d (diff)
memcg: move memcg_update_cache_size() to slab_common.c
`While growing per memcg caches arrays, we jump between memcontrol.c and slab_common.c in a weird way: memcg_alloc_cache_id - memcontrol.c memcg_update_all_caches - slab_common.c memcg_update_cache_size - memcontrol.c There's absolutely no reason why memcg_update_cache_size can't live on the slab's side though. So let's move it there and settle it comfortably amid per-memcg cache allocation functions. Besides, this patch cleans this function up a bit, removing all the useless comments from it, and renames it to memcg_update_cache_params to conform to memcg_alloc/free_cache_params, which we already have in slab_common.c. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: Glauber Costa <glommer@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c49
-rw-r--r--mm/slab_common.c30
2 files changed, 28 insertions, 51 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ef4fbc5e4ca3..fff511e25bb2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2958,55 +2958,6 @@ void memcg_update_array_size(int num)
memcg_limited_groups_array_size = num;
}
-int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
-{
- struct memcg_cache_params *cur_params = s->memcg_params;
- struct memcg_cache_params *new_params;
- size_t size;
- int i;
-
- VM_BUG_ON(!is_root_cache(s));
-
- size = num_groups * sizeof(void *);
- size += offsetof(struct memcg_cache_params, memcg_caches);
-
- new_params = kzalloc(size, GFP_KERNEL);
- if (!new_params)
- return -ENOMEM;
-
- new_params->is_root_cache = true;
-
- /*
- * There is the chance it will be bigger than
- * memcg_limited_groups_array_size, if we failed an allocation
- * in a cache, in which case all caches updated before it, will
- * have a bigger array.
- *
- * But if that is the case, the data after
- * memcg_limited_groups_array_size is certainly unused
- */
- for (i = 0; i < memcg_limited_groups_array_size; i++) {
- if (!cur_params->memcg_caches[i])
- continue;
- new_params->memcg_caches[i] =
- cur_params->memcg_caches[i];
- }
-
- /*
- * Ideally, we would wait until all caches succeed, and only
- * then free the old one. But this is not worth the extra
- * pointer per-cache we'd have to have for this.
- *
- * It is not a big deal if some caches are left with a size
- * bigger than the others. And all updates will reset this
- * anyway.
- */
- rcu_assign_pointer(s->memcg_params, new_params);
- if (cur_params)
- kfree_rcu(cur_params, rcu_head);
- return 0;
-}
-
static void memcg_register_cache(struct mem_cgroup *memcg,
struct kmem_cache *root_cache)
{
diff --git a/mm/slab_common.c b/mm/slab_common.c
index c2a8661f8b81..3a6e0cfdf03a 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -148,6 +148,33 @@ static void memcg_free_cache_params(struct kmem_cache *s)
kfree(s->memcg_params);
}
+static int memcg_update_cache_params(struct kmem_cache *s, int num_memcgs)
+{
+ int size;
+ struct memcg_cache_params *new_params, *cur_params;
+
+ BUG_ON(!is_root_cache(s));
+
+ size = offsetof(struct memcg_cache_params, memcg_caches);
+ size += num_memcgs * sizeof(void *);
+
+ new_params = kzalloc(size, GFP_KERNEL);
+ if (!new_params)
+ return -ENOMEM;
+
+ cur_params = s->memcg_params;
+ memcpy(new_params->memcg_caches, cur_params->memcg_caches,
+ memcg_limited_groups_array_size * sizeof(void *));
+
+ new_params->is_root_cache = true;
+
+ rcu_assign_pointer(s->memcg_params, new_params);
+ if (cur_params)
+ kfree_rcu(cur_params, rcu_head);
+
+ return 0;
+}
+
int memcg_update_all_caches(int num_memcgs)
{
struct kmem_cache *s;
@@ -158,9 +185,8 @@ int memcg_update_all_caches(int num_memcgs)
if (!is_root_cache(s))
continue;
- ret = memcg_update_cache_size(s, num_memcgs);
+ ret = memcg_update_cache_params(s, num_memcgs);
/*
- * See comment in memcontrol.c, memcg_update_cache_size:
* Instead of freeing the memory, we'll just leave the caches
* up to this point in an updated state.
*/

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