[GIT PULL] cgroup fixes for v4.8-rc4

[GIT PULL] cgroup fixes for v4.8-rc4

[Tejun Heo]

Hello, Linus.

Two fixes for cgroup.

* There still was a hole in enforcing cpuset rules, fixed by Li.

* Recent switch to global percpu_rwseom for threadgroup locking
  revealed a couple issues in how percpu_rwsem is implemented and used
  by cgroup.  Balbir found that the read locking section was too wide
  unnecessarily including operations which can often depend on IOs.
  With percpu_rwsem updates (coming through a different tree) and
  reduction of read locking section, all the reported locking latency
  issues, including the android one, are resolved.

  It looks like we can keep global percpu_rwsem locking for now.  If
  there actually are cases which can't be resolved, we can go back to
  more complex per-signal_struct locking.

Thanks.

The following changes since commit 29b4817d4018df78086157ea3a55c1d9424a7cfc:

  Linux 4.8-rc1 (2016-08-07 18:18:00 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-4.8-fixes

for you to fetch changes up to 568ac888215c7fb2fabe8ea739b00ec3c1f5d440:

  cgroup: reduce read locked section of cgroup_threadgroup_rwsem during fork (2016-08-17 09:54:52 -0400)

----------------------------------------------------------------
Balbir Singh (1):
      cgroup: reduce read locked section of cgroup_threadgroup_rwsem during fork

Zefan Li (1):
      cpuset: make sure new tasks conform to the current config of the cpuset

 kernel/cpuset.c | 15 +++++++++++++++
 kernel/fork.c   |  4 ++--
 2 files changed, 17 insertions(+), 2 deletions(-)

-- 
tejun