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| author | Tejun Heo <tj@kernel.org> | 2015-09-18 18:56:28 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2015-09-18 18:56:28 +0300 |
| commit | 9e10a130d9b62af976d17d120c95f3650769312c (patch) | |
| tree | 2a580955a56434f6e7c455a8f0ebf6eec71a9194 /mm | |
| parent | fc5ed1e95410ad73b2ab8f33cd90eb3bcf6c98a1 (diff) | |
| download | linux-9e10a130d9b62af976d17d120c95f3650769312c.tar.xz | |
cgroup: replace cgroup_on_dfl() tests in controllers with cgroup_subsys_on_dfl()
cgroup_on_dfl() tests whether the cgroup's root is the default
hierarchy; however, an individual controller is only interested in
whether the controller is attached to the default hierarchy and never
tests a cgroup which doesn't belong to the hierarchy that the
controller is attached to.
This patch replaces cgroup_on_dfl() tests in controllers with faster
static_key based cgroup_subsys_on_dfl(). This leaves cgroup core as
the only user of cgroup_on_dfl() and the function is moved from the
header file to cgroup.c.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 6ddaeba34e09..b35c4cc47a30 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -434,7 +434,7 @@ struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page) memcg = page->mem_cgroup; - if (!memcg || !cgroup_on_dfl(memcg->css.cgroup)) + if (!memcg || !cgroup_subsys_on_dfl(memory_cgrp_subsys)) memcg = root_mem_cgroup; rcu_read_unlock(); @@ -5059,7 +5059,7 @@ static void mem_cgroup_bind(struct cgroup_subsys_state *root_css) * guarantees that @root doesn't have any children, so turning it * on for the root memcg is enough. */ - if (cgroup_on_dfl(root_css->cgroup)) + if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) root_mem_cgroup->use_hierarchy = true; else root_mem_cgroup->use_hierarchy = false; |