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[PATCHSET cgroup/for-4.6] cgroup: make control mask updates modular and recursive

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Hello,

Currently, subsystem enabling and disabling in the default hierarchy
are implemented as a long chain of interdependent operations in
cgroup_subtree_control_write().  The function calculates what need to
be done to its children and excute the necessary operations.  The
function unfortunately ends up being a rather opaque blob of
operations which is difficult to wrap one's head around or reuse.

This patchset restructures control mask update so that it's composed
of discrete idempotent and recursive operations.  While no new
features are added by this patchset, future changes will make use of
flexible control mask updates to implement features involving more
complex controller management.

This patchset includes the following 12 patches.

 0001-cgroup-separate-out-interface-file-creation-from-css.patch
 0002-cgroup-explicitly-track-whether-a-cgroup_subsys_stat.patch
 0003-cgroup-reorder-operations-in-cgroup_mkdir.patch
 0004-cgroup-factor-out-cgroup_create-out-of-cgroup_mkdir.patch
 0005-cgroup-introduce-cgroup_control-and-cgroup_ss_mask.patch
 0006-cgroup-factor-out-cgroup_drain_offline-from-cgroup_s.patch
 0007-cgroup-factor-out-cgroup_apply_control_disable-from-.patch
 0008-cgroup-factor-out-cgroup_apply_control_enable-from-c.patch
 0009-cgroup-make-cgroup_drain_offline-and-cgroup_apply_co.patch
 0010-cgroup-introduce-cgroup_-save-propagate-restore-_con.patch
 0011-cgroup-Factor-out-cgroup_-apply-finalize-_control-fr.patch
 0012-cgroup-make-cgroup_calc_subtree_ss_mask-take-this_ss.patch

The patchset is on top of cgroup/for-4.6 6e5c830770f ("cgroup: make
cgroup subsystem masks u16") and available in the following git
branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-recursive-control

diffstat follows.  Thanks.

 include/linux/cgroup-defs.h |    3 
 kernel/cgroup.c             |  653 ++++++++++++++++++++++++++++----------------
 2 files changed, 419 insertions(+), 237 deletions(-)

--
tejun

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[PATCHSET cgroup/for-4.6] cgroup: make control mask updates modular and recursive Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 03/12] cgroup: reorder operations in cgroup_mkdir() Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 08/12] cgroup: factor out cgroup_apply_control_enable() from cgroup_subtree_control_write() Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 05/12] cgroup: introduce cgroup_control() and cgroup_ss_mask() Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 04/12] cgroup: factor out cgroup_create() out of cgroup_mkdir() Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 06/12] cgroup: factor out cgroup_drain_offline() from cgroup_subtree_control_write() Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 02/12] cgroup: explicitly track whether a cgroup_subsys_state is visible to userland Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 10/12] cgroup: introduce cgroup_{save|propagate|restore}_control() Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 01/12] cgroup: separate out interface file creation from css creation Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100
  [PATCH 09/12] cgroup: make cgroup_drain_offline() and cgroup_apply_control_{disable|enable}() recursive Tejun Heo <tj@kernel.org> - 2016-02-23 04:50 +0100

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