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authorBoris Burkov2020-05-27 14:43:19 -0700
committerTejun Heo2020-05-28 10:06:35 -0400
commit936f2a70f2077f64fab1dcb3eca71879e82ecd3f (patch)
tree7a649b1c8e4776ddbada58db00a69b56b9433942 /Documentation/admin-guide/cgroup-v2.rst
parent6b6ebb34744b21467aa01be7c53cc570fc41f70d (diff)
cgroup: add cpu.stat file to root cgroup
Currently, the root cgroup does not have a cpu.stat file. Add one which is consistent with /proc/stat to capture global cpu statistics that might not fall under cgroup accounting. We haven't done this in the past because the data are already presented in /proc/stat and we didn't want to add overhead from collecting root cgroup stats when cgroups are configured, but no cgroups have been created. By keeping the data consistent with /proc/stat, I think we avoid the first problem, while improving the usability of cgroups stats. We avoid the second problem by computing the contents of cpu.stat from existing data collected for /proc/stat anyway. Signed-off-by: Boris Burkov <boris@bur.io> Suggested-by: Tejun Heo <tj@kernel.org> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/cgroup-v2.rst')
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst6
1 files changed, 2 insertions, 4 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index bcc80269bb6a..341a6c2340d5 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -714,9 +714,7 @@ Conventions
- Settings for a single feature should be contained in a single file.
- The root cgroup should be exempt from resource control and thus
- shouldn't have resource control interface files. Also,
- informational files on the root cgroup which end up showing global
- information available elsewhere shouldn't exist.
+ shouldn't have resource control interface files.
- The default time unit is microseconds. If a different unit is ever
used, an explicit unit suffix must be present.
@@ -985,7 +983,7 @@ CPU Interface Files
All time durations are in microseconds.
cpu.stat
- A read-only flat-keyed file which exists on non-root cgroups.
+ A read-only flat-keyed file.
This file exists whether the controller is enabled or not.
It always reports the following three stats: