diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/cgroups/cgroups.txt | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index 2b51e12ce178..638bf17ff869 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -211,9 +211,10 @@ matches, and any of the requested subsystems are in use in an existing hierarchy, the mount will fail with -EBUSY. Otherwise, a new hierarchy is activated, associated with the requested subsystems. -It's not possible to bind a new subsystem to an active cgroup -hierarchy, or to unbind a subsystem from an active cgroup -hierarchy. +It's not currently possible to bind a new subsystem to an active +cgroup hierarchy, or to unbind a subsystem from an active cgroup +hierarchy. This may be possible in future, but is fraught with nasty +error-recovery issues. When a cgroup filesystem is unmounted, if there are any child cgroups created below the top-level cgroup, that hierarchy @@ -381,8 +382,10 @@ To Specify a hierarchy's release_agent: Note that specifying 'release_agent' more than once will return failure. -Note that changing the set of subsystems is only supported when the -hierarchy consists of a single (root) cgroup. +Note that changing the set of subsystems is currently only supported +when the hierarchy consists of a single (root) cgroup. Supporting +the ability to arbitrarily bind/unbind subsystems from an existing +cgroup hierarchy is intended to be implemented in the future. Then under /sys/fs/cgroup/rg1 you can find a tree that corresponds to the tree of the cgroups in the system. For instance, /sys/fs/cgroup/rg1 @@ -640,6 +643,13 @@ void exit(struct task_struct *task) Called during task exit. +void bind(struct cgroup *root) +(cgroup_mutex held by caller) + +Called when a cgroup subsystem is rebound to a different hierarchy +and root cgroup. Currently this will only involve movement between +the default hierarchy (which never has sub-cgroups) and a hierarchy +that is being created/destroyed (and hence has no sub-cgroups). 4. Extended attribute usage =========================== |