Support cgroup namespaces#13675
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cgroup namespaces are non hierarchical and they are defined primarily by a "root" cgroup node. The init cgroup namespaces's root node is the true root of the (only) cgroup2fs tree. The root node of other cgroup namespaces is the cgroup node of the task at the time of namespace creation. Residing in a cgroup namespace affects tasks this way: 1) The views into /proc/[pid]/cgroup and the "root" field under /proc/[pid]/mountinfo are virtualized: they are rendered relative to the reading task's cgroupns. 2) mount()ing a cgroup2 fs furnishes only a subtree of the full cgroup2fs tree, rooted at the "root" cgroup of the hosting cgroupns. Fixes #11989 PiperOrigin-RevId: 945868085
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Support cgroup namespaces
cgroup namespaces are non hierarchical and they are defined primarily by a
"root" cgroup node. The init cgroup namespaces's root node is the true root of
the (only) cgroup2fs tree. The root node of other cgroup namespaces is the
cgroup node of the task at the time of namespace creation.
Residing in a cgroup namespace affects tasks this way:
The views into /proc/[pid]/cgroup and the "root" field under
/proc/[pid]/mountinfo are virtualized: they are rendered relative to the
reading task's cgroupns.
mount()ing a cgroup2 fs furnishes only a subtree of the full cgroup2fs
tree, rooted at the "root" cgroup of the hosting cgroupns.
Fixes #11989