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→CGroups that are visible by tasks
== CGroups that are visible by tasks ==
== CGroups that are visible by tasks ==
Other than CGroups collected with tasks there can be other groups in which no tasks live. To pick up those CRIU gets the root set and saves all the CGroups tree starting from it. This information is stored in the <code>cgroup.controllers</code> image. In the same place CRIU saves the properties of CGroups -- these are values read from CGroup configuration files. Note -- since CRIU starts from root set and scans the directories tree, all the paths in this section are also subdirs of the root set's.
Other than CGroups collected with tasks there can be other groups in which no tasks live. To pick up those CRIU gets the root set and saves all the CGroups tree starting from it. This information is stored in the <code>cgroup.controllers</code> image. In the same place CRIU saves the properties of CGroups (i.e. values read from CGroup configuration files). Note that since CRIU starts from root set and scans the directories tree, all the paths in this section are also subdirs of the root set's.
In order to make CRIU handle this information on dump and restore one should specify the <code>--manage-cgroups</code> option.
In order to make CRIU handle this information on dump and restore one should specify the <code>--manage-cgroups</code> option.