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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 14:29:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 14:29:44 -0800
commit22714a2ba4b55737cd7d5299db7aaf1fa8287354 (patch)
tree32b25f2e3e40732156a8a8d0dcb2ddf38410776f /Documentation
parent766ec76a27aa9dfdfee3a80f29ddc1f7539c71f9 (diff)
parent5f2e673405b742be64e7c3604ed4ed3ac14f35ce (diff)
downloadlinux-22714a2ba4b55737cd7d5299db7aaf1fa8287354.tar.bz2
Merge branch 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup updates from Tejun Heo: "Cgroup2 cpu controller support is finally merged. - Basic cpu statistics support to allow monitoring by default without the CPU controller enabled. - cgroup2 cpu controller support. - /sys/kernel/cgroup files to help dealing with new / optional features" * 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: export list of cgroups v2 features using sysfs cgroup: export list of delegatable control files using sysfs cgroup: mark @cgrp __maybe_unused in cpu_stat_show() MAINTAINERS: relocate cpuset.c cgroup, sched: Move basic cpu stats from cgroup.stat to cpu.stat sched: Implement interface for cgroup unified hierarchy sched: Misc preps for cgroup unified hierarchy interface sched/cputime: Add dummy cputime_adjust() implementation for CONFIG_VIRT_CPU_ACCOUNTING_NATIVE cgroup: statically initialize init_css_set->dfl_cgrp cgroup: Implement cgroup2 basic CPU usage accounting cpuacct: Introduce cgroup_account_cputime[_field]() sched/cputime: Expose cputime_adjust()
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/cgroup-v2.txt42
1 files changed, 17 insertions, 25 deletions
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index dc44785dc0fa..779211fbb69f 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -893,10 +893,6 @@ Controllers
CPU
---
-.. note::
-
- The interface for the cpu controller hasn't been merged yet
-
The "cpu" controllers regulates distribution of CPU cycles. This
controller implements weight and absolute bandwidth limit models for
normal scheduling policy and absolute bandwidth allocation model for
@@ -910,12 +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
@@ -926,6 +926,18 @@ All time durations are in microseconds.
The weight in the range [1, 10000].
+ cpu.weight.nice
+ A read-write single value file which exists on non-root
+ cgroups. The default is "0".
+
+ The nice value is in the range [-20, 19].
+
+ This interface file is an alternative interface for
+ "cpu.weight" and allows reading and setting weight using the
+ same values used by nice(2). Because the range is smaller and
+ granularity is coarser for the nice values, the read value is
+ the closest approximation of the current weight.
+
cpu.max
A read-write two value file which exists on non-root cgroups.
The default is "max 100000".
@@ -938,26 +950,6 @@ All time durations are in microseconds.
$PERIOD duration. "max" for $MAX indicates no limit. If only
one number is written, $MAX is updated.
- cpu.rt.max
- .. note::
-
- The semantics of this file is still under discussion and the
- interface hasn't been merged yet
-
- A read-write two value file which exists on all cgroups.
- The default is "0 100000".
-
- The maximum realtime runtime allocation. Over-committing
- configurations are disallowed and process migrations are
- rejected if not enough bandwidth is available. It's in the
- following format::
-
- $MAX $PERIOD
-
- which indicates that the group may consume upto $MAX in each
- $PERIOD duration. If only one number is written, $MAX is
- updated.
-
Memory
------