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memcg: add accessor to mem_cgroup.css

Browse source 
So that an outside user can free the reference count grabbed by
try_get_mem_cgroup_from_page().

CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Hugh Dickins <hugh.dickins@tiscali.co.uk>
CC: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
CC: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Wu Fengguang 2009-12-16 12:19:59 +01:00 committed by Andi Kleen
parent e42d9d5d47
commit d324236b33
2 changed files with 12 additions and 0 deletions
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7
include/linux/memcontrol.h
View file

@ -81,6 +81,8 @@ int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
return cgroup == mem;
}
extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);
extern int
mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr);
extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
@ -206,6 +208,11 @@ static inline int task_in_mem_cgroup(struct task_struct *task,
return 1;
}
static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
{
return NULL;
}
static inline int
mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
{

5
mm/memcontrol.c
View file

@ -282,6 +282,11 @@ mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
return &mem->info.nodeinfo[nid]->zoneinfo[zid];
}
struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
{
return &mem->css;
}
static struct mem_cgroup_per_zone *
page_cgroup_zoneinfo(struct page_cgroup *pc)
{