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authorTejun Heo <tj@kernel.org>2014-07-09 02:02:56 +0400
committerTejun Heo <tj@kernel.org>2014-07-09 02:02:56 +0400
commit667c24917144e34880f821486bf0a6e4d05a3a14 (patch)
tree24cbd5b2d01808ab870f95061c8af419b3d687ee /include/linux/cgroup.h
parentc29adf24e0c443fb4433efb6a62bd91fdb739c34 (diff)
downloadlinux-667c24917144e34880f821486bf0a6e4d05a3a14.tar.xz
cgroup: introduce cgroup->subtree_control
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>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 8a111dd42d7a..8d52c8e5b510 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -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 */