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cgroup: introduce cgroup->subtree_control

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cgroup is implementing support for subsystem dependency which would
require a way to enable a subsystem even when it's not directly
configured through "cgroup.subtree_control".

Previously, cgroup->child_subsys_mask directly reflected
"cgroup.subtree_control" and the enabled subsystems in the child
cgroups.  This patch adds cgroup->subtree_control which
"cgroup.subtree_control" operates on.  cgroup->child_subsys_mask is
now calculated from cgroup->subtree_control by
cgroup_refresh_child_subsys_mask(), which sets it identical to
cgroup->subtree_control for now.

This will allow using cgroup->child_subsys_mask for all the enabled
subsystems including the implicit ones and ->subtree_control for
tracking the explicitly requested ones.  This patch keeps the two
masks identical and doesn't introduce any behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
This commit is contained in:
Tejun Heo
2014-07-08 18:02:56 -04:00
parent c29adf24e0
commit 667c249171
2 changed files with 36 additions and 18 deletions
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8
include/linux/cgroup.h
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@@ -203,7 +203,13 @@ struct cgroup {
struct kernfs_node *kn; /* cgroup kernfs entry */
struct kernfs_node *populated_kn; /* kn for "cgroup.subtree_populated" */
/* the bitmask of subsystems enabled on the child cgroups */
/*
* The bitmask of subsystems enabled on the child cgroups.
* ->subtree_control is the one configured through
* "cgroup.subtree_control" while ->child_subsys_mask is the
* effective one which may have more subsystems enabled.
*/
unsigned int subtree_control;
unsigned int child_subsys_mask;
/* Private pointers for each registered subsystem */