What is cgroup-utils?

cgroup-utils provides utility tools and libraries for control groups of Linux. For example, cgutil top is a top-like tool which shows activities of running processes in control groups.

Installation

For users

$ sudo pip install cgroup-utils

For developers

$ git clone git://github.com/peo3/cgroup-utils.git
$ cd cgroup-utils
$ python setup.py build
$ sudo python setup.py install

Packaging (rpm)

$ python setup.py bdist --formats=rpm

Available commands

• configs
• event
• mkdir
• pgrep
• rmdir
• stats
• top
• tree

cgutil configs

This command show you configurations of cgroups. By default, it shows only changed configurations.

Example output

$ cgutil configs -o memory
<root>
    notify_on_release=1
	release_agent=/usr/lib/ulatencyd/ulatencyd_cleanup.lua
sys_essential
	swappiness=0
	notify_on_release=1
sys_bg
	swappiness=100
	notify_on_release=1

cgutil event

This command makes cgroup.event_control easy to use. It exits when a state of a target cgroup crosses a threshold which you set, thus, you can know the state of the cgroup has changed.

Example output

$ cgutil event /sys/fs/cgroup/memory/system/sshd.service/memory.usage_in_bytes +1M
$ # It exits when memory usage of processes in the cgroup has increased one more MB.

cgutil pgrep

This command is alike pgrep command but it shows cgroups in addtion to PIDs.

Example output

$ cgutil pgrep ssh
/: 15072
/: 15074
/system/sshd.service: 630
$ cgutil pgrep ssh -l -f
/: 15072 sshd: ozaki-r [priv]
/: 15074 sshd: ozaki-r@pts/2
/: 15157 /bin/python /bin/cgutil pgrep ssh -l -f
/system/sshd.service: 630 /usr/sbin/sshd -D

cgutil stats

This command shows you states of cgroups.

Example output

$ cgutil stats
<root>
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system  
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/sm-client.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/sendmail.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/vboxadd-service.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/colord.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/colord-sane.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/udisks2.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}
system/cups.service
        stat={'throttled_time': 0L, 'nr_periods': 0L, 'nr_throttled': 0L}

cgutil top

This command is alike top command but it shows activities in a unit of cgroups.

Example output

$ cgutil top -i -n 2 -b
18.1 msec to collect statistics
[  CPUACCT  ]  [     BLKIO     ]  [        MEMORY       ]
 USR    SYS      READ    WRITE     TOTAL    RSS     SWAP     # NAME
  0.0%   0.0%    0.0 /s   0.0 /s     0.0    48.0k    0.0    97 usr_1000/default
20.5 msec to collect statistics
[  CPUACCT  ]  [     BLKIO     ]  [        MEMORY       ]
 USR    SYS      READ    WRITE     TOTAL    RSS     SWAP     # NAME
  0.0%   0.0%    0.0 /s   0.0 /s   128.0k    4.0k    0.0   104 sys_daemon
  0.0%   0.0%    0.0 /s   0.0 /s   -64.0k    0.0     0.0     0 sys_essential
  0.0%   0.0%    0.0 /s   0.0 /s   108.0k   32.0k    0.0    97 usr_1000/default

cgutil tree

This command shows you tree structure of cgroups.

Example outputs

$ cgutil tree -o blkio
<root>
   `system
       +sm-client.service
       +sendmail.service
       +vboxadd-service.service
       +colord.service
       +colord-sane.service
       +udisks2.service
       +cups.service
       +rtkit-daemon.service

(snip)

       [email protected]
       +udev.service
       `systemd-journald.service

Supported Linux Version

4.20.y

Supported subsystems

• blkio (and its debug feature)
• cpuset
• cpu and cpuacct
• devices
• freezer
• hugetlb
• memory
• net_cls
• net_prio
• pids
• rdma

Supported Python

• python2: 2.6 and above
  • deprecated
• python3: 3.4 and above
  • 3.0 to 3.3 may work but not tested

License

The tools are distributed under GPLv2. See COPYING for more detail.