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3.6. freezer
The
freezer subsystem suspends or resumes tasks in a cgroup.
- freezer.state
freezer.stateis only available in non-root cgroups and has three possible values:FROZEN— tasks in the cgroup are suspended.FREEZING— the system is in the process of suspending tasks in the cgroup.THAWED— tasks in the cgroup have resumed.
To suspend a specific process:
- Move that process to a cgroup in a hierarchy which has the
freezersubsystem attached to it. - Freeze that particular cgroup to suspend the process contained in it.
It is not possible to move a process into a suspended (frozen) cgroup.
Note that while the
FROZEN and THAWED values can be written to freezer.state, FREEZING cannot be written, only read.
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