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memcg: stop using css id

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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>
This commit is contained in:
Li Zefan 2013-09-23 16:56:47 +08:00 committed by Tejun Heo
parent 4219b2da20
commit b862783594
1 changed files with 8 additions and 16 deletions
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24
mm/memcontrol.c
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@ -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