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authorJohannes Weiner <>2021-04-29 22:56:20 -0700
committerLinus Torvalds <>2021-04-30 11:20:37 -0700
commita7df69b81aac5bdeb5c5aef9addd680ce22feebf (patch)
treec078ba8bad9ec0d28a11c280fc0308a1689f1f40 /block
parenta18e6e6e150a98b9ce3e9acabeff407e7b6ba0c0 (diff)
cgroup: rstat: support cgroup1
Rstat currently only supports the default hierarchy in cgroup2. In order to replace memcg's private stats infrastructure - used in both cgroup1 and cgroup2 - with rstat, the latter needs to support cgroup1. The initialization and destruction callbacks for regular cgroups are already in place. Remove the cgroup_on_dfl() guards to handle cgroup1. The initialization of the root cgroup is currently hardcoded to only handle cgrp_dfl_root.cgrp. Move those callbacks to cgroup_setup_root() and cgroup_destroy_root() to handle the default root as well as the various cgroup1 roots we may set up during mounting. The linking of css to cgroups happens in code shared between cgroup1 and cgroup2 as well. Simply remove the cgroup_on_dfl() guard. Linkage of the root css to the root cgroup is a bit trickier: per default, the root css of a subsystem controller belongs to the default hierarchy (i.e. the cgroup2 root). When a controller is mounted in its cgroup1 version, the root css is stolen and moved to the cgroup1 root; on unmount, the css moves back to the default hierarchy. Annotate rebind_subsystems() to move the root css linkage along between roots. Link: Signed-off-by: Johannes Weiner <> Reviewed-by: Roman Gushchin <> Reviewed-by: Shakeel Butt <> Acked-by: Tejun Heo <> Reviewed-by: Michal Koutný <> Cc: Michal Hocko <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
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