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cgroup: remove the ns_cgroup

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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 <[email protected]>
Signed-off-by: Serge E. Hallyn <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Jamal Hadi Salim <[email protected]>
Reviewed-by: Li Zefan <[email protected]>
Acked-by: Paul Menage <[email protected]>
Acked-by: Matt Helsley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Daniel Lezcano 2011-05-26 16:25:23 -07:00 • committed by Linus Torvalds
commit a77aea9201
22 changed files with 4 additions and 287 deletions
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8
init/Kconfig
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@ -589,14 +589,6 @@ config CGROUP_DEBUG
Say N if unsure.
config CGROUP_NS
bool "Namespace cgroup subsystem"
help
Provides a simple namespace cgroup subsystem to
provide hierarchical naming of sets of namespaces,
for instance virtual servers and checkpoint/restart
jobs.
config CGROUP_FREEZER
bool "Freezer cgroup subsystem"
help