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| author |   Tejun Heo <tj@kernel.org> | 2015-05-22 17:13:20 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2015-06-02 08:33:33 -0600 |
| commit | 56161634e4824380a67243a4cf3fa52eb1e5d836 (patch) | |
| tree | f270436ae91d6a472efc425c256f487460e9b108 /mm/memcontrol.c | |
| parent | blkcg: always create the blkcg_gq for the root blkcg (diff) | |
| download | linux-dev-56161634e4824380a67243a4cf3fa52eb1e5d836.tar.xz linux-dev-56161634e4824380a67243a4cf3fa52eb1e5d836.zip | |
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.c | 2 |
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; |