cgroups: Task counter subsystem v6

Hi Andrew,

This contains minor changes, mostly documentation and changelog
updates, off-case build fix, and a code optimization in
res_counter_common_ancestor().

It's hard to put some statistic numbers while testing this feature
given that the result is rather binary: we launch a forkbomb and
either we stop and kill it or the system become unresponsive.
    
Meanwhile, one can find a testsuite at this address:
https://tglx.de/~fweisbec/task_counter_test.tar.gz
    
It performs several checks to ensure the interface and the behaviour
are reliable after common events like moving tasks around over cgroups
in a hierarchy, forking inside, etc.. It also launches a forkbomb,
tries to stop and kill it. So beware, don't run it on a system that
is doing serious things. Ensure you have CGROUP_TASK_COUNTER set
before, or it may compress the Ten Plagues in your MBR and
inflate the whole after your next reboot.

Changes in v6:

- Update res_counter_common_ancestor() to be O(n+m) instead of O(n*m),
patch from Kirill A. Shutemov (6/10)
- Refine documentation and changelog to better explain the claims and
goals of this subsystem (10/10)
- Fix !CONFIG_CGROUPS build crash (10/10)
- Step over the temporary state that used an ad-hoc fork hook.

Frederic Weisbecker (9):
  cgroups: Add res_counter_write_u64() API
  cgroups: New resource counter inheritance API
  cgroups: Add previous cgroup in can_attach_task/attach_task callbacks
  cgroups: New cancel_attach_task subsystem callback
  cgroups: Ability to stop res charge propagation on bounded ancestor
  res_counter: Allow charge failure pointer to be null
  cgroups: Pull up res counter charge failure interpretation to caller
  cgroups: Allow subsystems to cancel a fork
  cgroups: Add a task counter subsystem

Kirill A. Shutemov (1):
  cgroups: Add res counter common ancestor searching

 Documentation/cgroups/cgroups.txt          |   13 ++-
 Documentation/cgroups/resource_counter.txt |   20 +++-
 Documentation/cgroups/task_counter.txt     |  153 ++++++++++++++++++
 block/blk-cgroup.c                         |   12 +-
 include/linux/cgroup.h                     |   28 +++-
 include/linux/cgroup_subsys.h              |    8 +
 include/linux/res_counter.h                |   27 +++-
 init/Kconfig                               |    9 +
 kernel/Makefile                            |    1 +
 kernel/cgroup.c                            |   58 ++++++--
 kernel/cgroup_freezer.c                    |    9 +-
 kernel/cgroup_task_counter.c               |  239 ++++++++++++++++++++++++++++
 kernel/cpuset.c                            |    6 +-
 kernel/events/core.c                       |    5 +-
 kernel/exit.c                              |    2 +-
 kernel/fork.c                              |    7 +-
 kernel/res_counter.c                       |   97 ++++++++++--
 kernel/sched.c                             |    6 +-
 18 files changed, 644 insertions(+), 56 deletions(-)
 create mode 100644 Documentation/cgroups/task_counter.txt
 create mode 100644 kernel/cgroup_task_counter.c

-- 
1.7.5.4

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