[GIT PULL] cgroup changes for v4.2-rc1

[Tejun Heo]

Hello, Linus.

* threadgroup_lock got reorganized so that its users can pick the
  actual locking mechanism to use.  Its only user - cgroups - is
  updated to use a percpu_rwsem instead of per-process rwsem.  This
  makes things a bit lighter on hot paths and allows cgroups to
  perform and fail multi-task (a process) migrations atomically.
  Multi-task migrations are used in several places including the
  unified hierarchy.

* Delegation rule and documentation added to unified hierarchy.  This
  will likely be the last interface update from the cgroup core side
  for unified hierarchy before lifting the devel mask.

* Some groundwork for the pids controller which is scheduled to be
  merged in the coming devel cycle.

Thanks.

The following changes since commit 27cf3a16b2535a490f8cf1d29a6634f1c70f7831:

  Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit (2015-04-22 14:49:23 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-4.2

for you to fetch changes up to 8a0792ef8e01f03cb43806c6a87738bde34df713:

  cgroup: add delegation section to unified hierarchy documentation (2015-06-18 16:54:28 -0400)

----------------------------------------------------------------
Aleksa Sarai (4):
      cgroup: switch to unsigned long for bitmasks
      cgroup: use bitmask to filter for_each_subsys
      cgroup: replace explicit ss_mask checking with for_each_subsys_which
      cgroup: fix uninitialised iterator in for_each_subsys_which

Arnd Bergmann (1):
      cgroup: add seq_file forward declaration for struct cftype

Chen Hanxiao (1):
      cgroup: fix some comment typos

Tejun Heo (10):
      cgroup: separate out include/linux/cgroup-defs.h
      cgroup: reorganize include/linux/cgroup.h
      sched, cgroup: reorganize threadgroup locking
      sched, cgroup: replace signal_struct->group_rwsem with a global percpu_rwsem
      cgroup: simplify threadgroup locking
      MAINTAINERS: add a cgroup core co-maintainer
      kernfs: make kernfs_get_inode() public
      cgroup: separate out cgroup_procs_write_permission() from __cgroup_procs_write()
      cgroup: require write perm on common ancestor when moving processes on the default hierarchy
      cgroup: add delegation section to unified hierarchy documentation

 Documentation/cgroups/unified-hierarchy.txt |  102 ++-
 MAINTAINERS                                 |    1 +
 fs/kernfs/kernfs-internal.h                 |    1 -
 include/linux/cgroup-defs.h                 |  501 +++++++++++++
 include/linux/cgroup.h                      | 1051 ++++++++-------------------
 include/linux/init_task.h                   |    8 -
 include/linux/kernfs.h                      |    5 +
 include/linux/sched.h                       |   65 +-
 init/Kconfig                                |    1 +
 kernel/cgroup.c                             |  273 +++----
 kernel/fork.c                               |    4 -
 11 files changed, 1050 insertions(+), 962 deletions(-)
 create mode 100644 include/linux/cgroup-defs.h

-- 
tejun
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