[PATCH v4 0/4] cpuacct: split usage into user_usage and sys_usage

[Zhao Lei <zhaolei@cn.fujitsu.com>]

Sometimes, cpuacct.usage is not detialed enough to user
to see how much usage a group used. We want to know how
much time it used in user mode and how much in kernel mode.

This patch introduce some more files to tell user these information.
 # ls /sys/fs/cgroup/cpuacct/cpuacct.usage*
 /sys/fs/cgroup/cpuacct/cpuacct.usage
 /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu
 /sys/fs/cgroup/cpuacct/cpuacct.usage_user
 /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu_user
 /sys/fs/cgroup/cpuacct/cpuacct.usage_sys
 /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu_sys

Changelog v3->v4:
1: Add a patch to use for_each_possible_cpu to iterate all cpus,
   Suggested-by: Peter Zijlstra <peterz@infradead.org>

Changelog v2->v3:
1: Remove some unnecessary locks and so some cleanup based on
   suggestion from Peter Zijlstra <peterz@infradead.org>

Changelog v1->v2:
1: Rebase on top of 4.5-rc6
2: Fix little spelling typo in description.
3: Fix line over 80 characters

Yang Dongsheng (2):
  cpuacct: rename parameter in cpuusage_write for readability
  cpuacct: split usage into user_usage and sys_usage.


Zhao Lei (2):
  cpuacct: small restruct for cpuacct
  cpuacct: Show possible_cpu in cpuacct

 kernel/sched/cpuacct.c | 173 ++++++++++++++++++++++++++++++++++---------------
 kernel/sched/cpuacct.h |   4 +-
 2 files changed, 124 insertions(+), 53 deletions(-)

-- 
1.8.5.1