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slab: reorganize memcg_cache_params

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We're going to change how memcg caches are iterated.  In preparation,
clean up and reorganize memcg_cache_params.

* The shared ->list is replaced by ->children in root and
  ->children_node in children.

* ->is_root_cache is removed.  Instead ->root_cache is moved out of
  the child union and now used by both root and children.  NULL
  indicates root cache.  Non-NULL a memcg one.

This patch doesn't cause any observable behavior changes.

Link: http://lkml.kernel.org/r/20170117235411.9408-5-tj@kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo
2017-02-22 15:41:17 -08:00
committed by Linus Torvalds
parent 657dc2f972
commit 9eeadc8b6e
3 changed files with 40 additions and 24 deletions
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33
include/linux/slab.h
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@@ -545,22 +545,37 @@ struct memcg_cache_array {
* array to be accessed without taking any locks, on relocation we free the old
* version only after a grace period.
*
* Child caches will hold extra metadata needed for its operation. Fields are:
* Root and child caches hold different metadata.
*
* @memcg: pointer to the memcg this cache belongs to
* @root_cache: pointer to the global, root cache, this cache was derived from
* @root_cache: Common to root and child caches. NULL for root, pointer to
* the root cache for children.
*
* Both root and child caches of the same kind are linked into a list chained
* through @list.
* The following fields are specific to root caches.
*
* @memcg_caches: kmemcg ID indexed table of child caches. This table is
* used to index child cachces during allocation and cleared
* early during shutdown.
*
* @children: List of all child caches. While the child caches are also
* reachable through @memcg_caches, a child cache remains on
* this list until it is actually destroyed.
*
* The following fields are specific to child caches.
*
* @memcg: Pointer to the memcg this cache belongs to.
*
* @children_node: List node for @root_cache->children list.
*/
struct memcg_cache_params {
bool is_root_cache;
struct list_head list;
struct kmem_cache *root_cache;
union {
struct memcg_cache_array __rcu *memcg_caches;
struct {
struct memcg_cache_array __rcu *memcg_caches;
struct list_head children;
};
struct {
struct mem_cgroup *memcg;
struct kmem_cache *root_cache;
struct list_head children_node;
};
};
};