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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:20 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:33 -0600
commit56161634e4824380a67243a4cf3fa52eb1e5d836 (patch)
treef270436ae91d6a472efc425c256f487460e9b108 /mm/memcontrol.c
parentec13b1d6f0a0457312e615335ce8ceb07da50a11 (diff)
memcg: add mem_cgroup_root_css
Add global mem_cgroup_root_css which points to the root memcg css. This will be used by cgroup writeback support. If memcg is disabled, it's defined as ERR_PTR(-EINVAL). Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> aCc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c23c1a3e8e16..b22a92b37480 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -77,6 +77,7 @@ EXPORT_SYMBOL(memory_cgrp_subsys);
#define MEM_CGROUP_RECLAIM_RETRIES 5
static struct mem_cgroup *root_mem_cgroup __read_mostly;
+struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;
/* Whether the swap controller is active */
#ifdef CONFIG_MEMCG_SWAP
@@ -4441,6 +4442,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
/* root ? */
if (parent_css == NULL) {
root_mem_cgroup = memcg;
+ mem_cgroup_root_css = &memcg->css;
page_counter_init(&memcg->memory, NULL);
memcg->high = PAGE_COUNTER_MAX;
memcg->soft_limit = PAGE_COUNTER_MAX;