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authorTejun Heo <tj@kernel.org>2014-07-09 10:08:08 -0400
committerTejun Heo <tj@kernel.org>2014-07-09 10:08:08 -0400
commitaa6ec29bee8692ce232132f1a1ea2a1f9196610e (patch)
tree6edb7f3fa4a3ac01ab03d874918a8c45e0b55e40 /mm
parentc1d5d42efdb3e0470c1cfd2fcb50bc3eae813283 (diff)
cgroup: remove sane_behavior support on non-default hierarchies
sane_behavior has been used as a development vehicle for the default unified hierarchy. Now that the default hierarchy is in place, the flag became redundant and confusing as its usage is allowed on all hierarchies. There are gonna be either the default hierarchy or legacy ones. Let's make that clear by removing sane_behavior support on non-default hierarchies. This patch replaces cgroup_sane_behavior() with cgroup_on_dfl(). The comment on top of CGRP_ROOT_SANE_BEHAVIOR is moved to on top of cgroup_on_dfl() with sane_behavior specific part dropped. On the default and legacy hierarchies w/o sane_behavior, this shouldn't cause any behavior differences. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index db536e90c8ee..a2a4bd69a7ae 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -7024,16 +7024,17 @@ static void mem_cgroup_move_task(struct cgroup_subsys_state *css,
/*
* Cgroup retains root cgroups across [un]mount cycles making it necessary
- * to verify sane_behavior flag on each mount attempt.
+ * to verify whether we're attached to the default hierarchy on each mount
+ * attempt.
*/
static void mem_cgroup_bind(struct cgroup_subsys_state *root_css)
{
/*
- * use_hierarchy is forced with sane_behavior. cgroup core
+ * use_hierarchy is forced on the default hierarchy. cgroup core
* guarantees that @root doesn't have any children, so turning it
* on for the root memcg is enough.
*/
- if (cgroup_sane_behavior(root_css->cgroup))
+ if (cgroup_on_dfl(root_css->cgroup))
mem_cgroup_from_css(root_css)->use_hierarchy = true;
}