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memcg: clean up memcg->nodeinfo

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Remove struct mem_cgroup_lru_info and fold its single member, the
variably sized nodeinfo[0], directly into struct mem_cgroup.  This
should make it more obvious why it has to be the last member there.

Also move the comment that's above that special last member below it, so
it is more visible to somebody that considers appending to the struct
mem_cgroup.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2013-07-08 15:59:49 -07:00 committed by Linus Torvalds
parent 9a2458a633
commit 54f72fe022
1 changed files with 5 additions and 15 deletions
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20
mm/memcontrol.c
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@ -187,10 +187,6 @@ struct mem_cgroup_per_node {
struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
};
struct mem_cgroup_lru_info {
struct mem_cgroup_per_node *nodeinfo[0];
};
/*
* Cgroups above their limits are maintained in a RB-Tree, independent of
* their hierarchy representation
@ -366,14 +362,8 @@ struct mem_cgroup {
atomic_t numainfo_updating;
#endif
/*
* Per cgroup active and inactive list, similar to the
* per zone LRU lists.
*
* WARNING: This has to be the last element of the struct. Don't
* add new fields after this point.
*/
struct mem_cgroup_lru_info info;
struct mem_cgroup_per_node *nodeinfo[0];
/* WARNING: nodeinfo must be the last member here */
};
static size_t memcg_size(void)
@ -683,7 +673,7 @@ static struct mem_cgroup_per_zone *
mem_cgroup_zoneinfo(struct mem_cgroup *memcg, int nid, int zid)
{
VM_BUG_ON((unsigned)nid >= nr_node_ids);
return &memcg->info.nodeinfo[nid]->zoneinfo[zid];
return &memcg->nodeinfo[nid]->zoneinfo[zid];
}
struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg)
@ -6087,13 +6077,13 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
mz->on_tree = false;
mz->memcg = memcg;
}
memcg->info.nodeinfo[node] = pn;
memcg->nodeinfo[node] = pn;
return 0;
}
static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
{
kfree(memcg->info.nodeinfo[node]);
kfree(memcg->nodeinfo[node]);
}
static struct mem_cgroup *mem_cgroup_alloc(void)