[PATCH 0/1, v9] cgroup/freezer: add per freezer duty ratio control

[jacob . jun . pan]

From: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>

Fixing subject in cover letter, should be v4 instead of v3

Changelog:
v9:	- merged duty ratio related data structs
	- removed toggling bit, replaced with freezer->state
	- consolidated toggling mode cancellation function	
	- use spin lock to protect duty ratio parameter writes
	- use second as period
	- allow 0% and 100% frozen time, aligned behavior with
	  freezer_write()
v8:	- minor clean up
v7:	- use delayed workqueue instead of per cgroup kernel thread
	  to manage toggling
	- make freezer.state higher priority than duty ratio setting
	- small correction in documentation

v6:	- remove check for duty ratio == 100 case
v5:	- improve error handling in duty ratio/ period writes
	- fix the logic to avoid kthread creation when ratio and
	  period are invalid.
	- 100% frozen is not permitted in duty ratio set up

v4:	- limit kthread creation only when valid duty ratio
	  parameters are given.
	- changed period back to milisecond
	- consolidated paramter write functions

v3:	- added documentation

v2:
	- use read_u64/write_u64 instead of string read/write
	- use period in second instead of ms
	- renamed duty_ratio to duty_ratio_pct, be more specific
	- removed locking around period and duty_ratio reads


Jacob Pan (1):
  cgroup/freezer: add per freezer duty ratio control

 Documentation/cgroups/freezer-subsystem.txt |   23 ++++++
 kernel/cgroup_freezer.c                     |  109 ++++++++++++++++++++++++++-
 2 files changed, 130 insertions(+), 2 deletions(-)

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