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cgroup: update cgroup->subsys_mask to ->child_subsys_mask and restore cgroup_root->subsys_mask

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944196278d ("cgroup: move ->subsys_mask from cgroupfs_root to
cgroup") moved ->subsys_mask from cgroup_root to cgroup to prepare for
the unified hierarhcy; however, it turns out that carrying the
subsys_mask of the children in the parent, instead of itself, is a lot
more natural.  This patch restores cgroup_root->subsys_mask and morphs
cgroup->subsys_mask into cgroup->child_subsys_mask.

* Uses of root->cgrp.subsys_mask are restored to root->subsys_mask.

* Remove automatic setting and clearing of cgrp->subsys_mask and
  instead just inherit ->child_subsys_mask from the parent during
  cgroup creation.  Note that this doesn't affect any current
  behaviors.

* Undo __kill_css() separation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo
2014-04-23 11:13:14 -04:00
parent ea8fd3b47f
commit f392e51cd6
2 changed files with 32 additions and 39 deletions
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7
include/linux/cgroup.h
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@@ -173,8 +173,8 @@ struct cgroup {
*/
u64 serial_nr;
/* The bitmask of subsystems attached to this cgroup */
unsigned long subsys_mask;
/* the bitmask of subsystems enabled on the child cgroups */
unsigned long child_subsys_mask;
/* Private pointers for each registered subsystem */
struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT];
@@ -282,6 +282,9 @@ enum {
struct cgroup_root {
struct kernfs_root *kf_root;
/* The bitmask of subsystems attached to this hierarchy */
unsigned long subsys_mask;
/* Unique id for this hierarchy. */
int hierarchy_id;