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authorTejun Heo <tj@kernel.org>2017-10-23 16:18:27 -0700
committerTejun Heo <tj@kernel.org>2017-10-26 10:56:33 -0700
commitd41bf8c9deaed1a90b18d3ffc5639d4c19f0259a (patch)
tree38573de8fb3d037a30430bd16af6806031c2036c /Documentation
parent0d5936344f30aba0f6ddb92b030cb6a05168efe6 (diff)
cgroup, sched: Move basic cpu stats from cgroup.stat to cpu.stat
The basic cpu stat is currently shown with "cpu." prefix in cgroup.stat, and the same information is duplicated in cpu.stat when cpu controller is enabled. This is ugly and not very scalable as we want to expand the coverage of stat information which is always available. This patch makes cgroup core always create "cpu.stat" file and show the basic cpu stat there and calls the cpu controller to show the extra stats when enabled. This ensures that the same information isn't presented in multiple places and makes future expansion of basic stats easier. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/cgroup-v2.txt15
1 files changed, 5 insertions, 10 deletions
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index 0bbdc720dd7c..779211fbb69f 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -886,15 +886,6 @@ All cgroup core files are prefixed with "cgroup."
A dying cgroup can consume system resources not exceeding
limits, which were active at the moment of cgroup deletion.
- cpu.usage_usec
- CPU time consumed in the subtree.
-
- cpu.user_usec
- User CPU time consumed in the subtree.
-
- cpu.system_usec
- System CPU time consumed in the subtree.
-
Controllers
===========
@@ -915,12 +906,16 @@ All time durations are in microseconds.
cpu.stat
A read-only flat-keyed file which exists on non-root cgroups.
+ This file exists whether the controller is enabled or not.
- It reports the following six stats:
+ It always reports the following three stats:
- usage_usec
- user_usec
- system_usec
+
+ and the following three when the controller is enabled:
+
- nr_periods
- nr_throttled
- throttled_usec