Cgroup

1. 基本操作

  • Mount cgroup

    mount -t cgroup -o none,name=systemd cgroup /sys/fs/cgroup/systemd
mount -t cgroup -o devices cgroup /sys/fs/cgroup/devices
mount -t cgroup -o memory cgroup /sys/fs/cgroup/memory
mount -t cgroup -o cpuset cgroup /sys/fs/cgroup/cpuset
mount -t cgroup -o freezer cgroup /sys/fs/cgroup/freezer
mount -t cgroup -o net_cls cgroup /sys/fs/cgroup/net_cls
mount -t cgroup -o blkio cgroup /sys/fs/cgroup/blkio
mount -t cgroup -o cpu,cpuacct cgroup /sys/fs/cgroup/cpu,cpuacct

    注：

    • Cgroup v1 named hierarchies

      mount -t cgroup -o none,name=somename none /some/mount/point

      Multiple instances of such hierarchies can be mounted; each hierarchy must have a unique name. The only purpose of such hierarchies is to track processes. (See the discussion of release notification below.) An example of this is the name=systemd cgroup hierarchy that is used by systemd(1) to track services and user sessions.

    • mount -t cgroup -o cpuset none /cpuset 中 none的作用

      Certain filesystems aren't associated with a physical device (such as a partition or network share, which is what is expected at that point in the mount command) and it is/was customary to use none for these.

  • 向task中增加pid

    每次只能echo一个pid到task里

    Attaching processes
-----------------------

# /bin/echo PID > tasks

Note that it is PID, not PIDs. You can only attach ONE task at a time.
If you have several tasks to attach, you have to do it one after another:

# /bin/echo PID1 > tasks
# /bin/echo PID2 > tasks
    ...
# /bin/echo PIDn > tasks

  • 向task中减少pid

    如果想把一个pid从某个cgroup task里移除，可以将它echo到另一个(比如：根cgroup)下即可，因为每个pid都必须属于某个cgroup管理。

参考资料

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