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docs: document the user.delegate xattr

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Lennart Poettering 2022-03-16 16:31:24 +01:00
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docs/CGROUP_DELEGATION.md
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@ -253,6 +253,13 @@ So, if you want to do your own raw cgroups kernel level access, then allocate a
scope unit, or a service unit (or just use the service unit you already have
for your service code), and turn on delegation for it.
The service manager sets the `user.delegate` extended attribute (readable via
`getxattr(2)` and related calls) to the character `1` on cgroup directories
where delegation is enabled (and removes it on those cgroups where it is
not). This may be used by service programs to determine whether a cgroup tree
was delegated to them. Note that this is only supported on kernels 5.6 and
newer in combination with systemd 251 and newer.
(OK, here's one caveat: if you turn on delegation for a service, and that
service has `ExecStartPost=`, `ExecReload=`, `ExecStop=` or `ExecStopPost=`
set, then these commands will be executed within the `.control/` sub-cgroup of