[RFC 0/4] cgroup hierarchy controls and stats

[Roman Gushchin <guro-b10kYP2dOMg@public.gmane.org>]

Creating cgroup hierearchies of an unreasonable size can affect
system performance. A user might want to limit the size
of the cgroup hierarchy.

This patchset implements an ability to control and monitor cgroup
hierarchy size.

Patch 1 implements tracking of live and dying descendant cgroups
        on each cgroup level.
Patch 2 adds cgroup.max.descendants and cgroup.max.depth interfaces
        to set up hierarchy limits.
Patch 3 adds cgroup.stat interface with simple hierarchy stats.
Patch 4 is a trivial cleanup.

Roman Gushchin (4):
  cgroup: keep track of number of descent cgroups
  cgroup: implement hierarchy limits
  cgroup: add cgroup.stat interface with basic hierarchy stats
  cgroup: re-use the parent pointer in cgroup_destroy_locked()

 Documentation/cgroup-v2.txt |  32 +++++++++
 include/linux/cgroup-defs.h |  13 ++++
 kernel/cgroup/cgroup.c      | 163 +++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 205 insertions(+), 3 deletions(-)

--
2.13.3