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authorLi Zefan <lizefan@huawei.com>2013-09-23 16:56:47 +0800
committerTejun Heo <tj@kernel.org>2013-09-23 21:44:15 -0400
commitb862783594847a1087cd18c8aeac5727608c3c67 (patch)
tree925b8f31cff32fe3bcc9422b2e6fddc1bf836641 /mm
parent4219b2da206b3787dea4950ec53ccbc203f50e5e (diff)
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memcg: stop using css id
Now memcg uses cgroup id instead of css id. Update some comments and set mem_cgroup_subsys->use_id to 0. Signed-off-by: Li Zefan <lizefan@huawei.com> Acked-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c24
1 files changed, 8 insertions, 16 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c14039575608..65a46eff5c3d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -582,16 +582,11 @@ static void disarm_sock_keys(struct mem_cgroup *memcg)
#ifdef CONFIG_MEMCG_KMEM
/*
* This will be the memcg's index in each cache's ->memcg_params->memcg_caches.
- * There are two main reasons for not using the css_id for this:
- * 1) this works better in sparse environments, where we have a lot of memcgs,
- * but only a few kmem-limited. Or also, if we have, for instance, 200
- * memcgs, and none but the 200th is kmem-limited, we'd have to have a
- * 200 entry array for that.
- *
- * 2) In order not to violate the cgroup API, we would like to do all memory
- * allocation in ->create(). At that point, we haven't yet allocated the
- * css_id. Having a separate index prevents us from messing with the cgroup
- * core for this
+ * The main reason for not using cgroup id for this:
+ * this works better in sparse environments, where we have a lot of memcgs,
+ * but only a few kmem-limited. Or also, if we have, for instance, 200
+ * memcgs, and none but the 200th is kmem-limited, we'd have to have a
+ * 200 entry array for that.
*
* The current size of the caches array is stored in
* memcg_limited_groups_array_size. It will double each time we have to
@@ -606,14 +601,14 @@ int memcg_limited_groups_array_size;
* cgroups is a reasonable guess. In the future, it could be a parameter or
* tunable, but that is strictly not necessary.
*
- * MAX_SIZE should be as large as the number of css_ids. Ideally, we could get
+ * MAX_SIZE should be as large as the number of cgrp_ids. Ideally, we could get
* this constant directly from cgroup, but it is understandable that this is
* better kept as an internal representation in cgroup.c. In any case, the
- * css_id space is not getting any smaller, and we don't have to necessarily
+ * cgrp_id space is not getting any smaller, and we don't have to necessarily
* increase ours as well if it increases.
*/
#define MEMCG_CACHES_MIN_SIZE 4
-#define MEMCG_CACHES_MAX_SIZE 65535
+#define MEMCG_CACHES_MAX_SIZE MEM_CGROUP_ID_MAX
/*
* A lot of the calls to the cache allocation functions are expected to be
@@ -5984,8 +5979,6 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg)
int node;
size_t size = memcg_size();
- free_css_id(&mem_cgroup_subsys, &memcg->css);
-
for_each_node(node)
free_mem_cgroup_per_zone_info(memcg, node);
@@ -6766,7 +6759,6 @@ struct cgroup_subsys mem_cgroup_subsys = {
.bind = mem_cgroup_bind,
.base_cftypes = mem_cgroup_files,
.early_init = 0,
- .use_id = 1,
};
#ifdef CONFIG_MEMCG_SWAP