linux-stable/include/linux/cgroup_subsys.h
Daniel Lezcano a77aea9201 cgroup: remove the ns_cgroup
The ns_cgroup is an annoying cgroup at the namespace / cgroup frontier and
leads to some problems:

  * cgroup creation is out-of-control
  * cgroup name can conflict when pids are looping
  * it is not possible to have a single process handling a lot of
    namespaces without falling in a exponential creation time
  * we may want to create a namespace without creating a cgroup

  The ns_cgroup was replaced by a compatibility flag 'clone_children',
  where a newly created cgroup will copy the parent cgroup values.
  The userspace has to manually create a cgroup and add a task to
  the 'tasks' file.

This patch removes the ns_cgroup as suggested in the following thread:

https://lists.linux-foundation.org/pipermail/containers/2009-June/018616.html

The 'cgroup_clone' function is removed because it is no longer used.

This is a userspace-visible change.  Commit 45531757b4 ("cgroup: notify
ns_cgroup deprecated") (merged into 2.6.27) caused the kernel to emit a
printk warning users that the feature is planned for removal.  Since that
time we have heard from XXX users who were affected by this.

Signed-off-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Jamal Hadi Salim <hadi@cyberus.ca>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Acked-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-26 17:12:34 -07:00

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C

/* Add subsystem definitions of the form SUBSYS(<name>) in this
* file. Surround each one by a line of comment markers so that
* patches don't collide
*/
/* */
/* */
#ifdef CONFIG_CPUSETS
SUBSYS(cpuset)
#endif
/* */
#ifdef CONFIG_CGROUP_DEBUG
SUBSYS(debug)
#endif
/* */
#ifdef CONFIG_CGROUP_SCHED
SUBSYS(cpu_cgroup)
#endif
/* */
#ifdef CONFIG_CGROUP_CPUACCT
SUBSYS(cpuacct)
#endif
/* */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
SUBSYS(mem_cgroup)
#endif
/* */
#ifdef CONFIG_CGROUP_DEVICE
SUBSYS(devices)
#endif
/* */
#ifdef CONFIG_CGROUP_FREEZER
SUBSYS(freezer)
#endif
/* */
#ifdef CONFIG_NET_CLS_CGROUP
SUBSYS(net_cls)
#endif
/* */
#ifdef CONFIG_BLK_CGROUP
SUBSYS(blkio)
#endif
#ifdef CONFIG_CGROUP_PERF
SUBSYS(perf)
#endif
/* */