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| author | Daniel Lezcano <daniel.lezcano@free.fr> | 2011-05-27 01:25:23 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-27 02:12:34 +0200 |
| commit | a77aea92010acf54ad785047234418d5d68772e2 (patch) | |
| tree | c7cb57b62fd02bee2baceb79251923f7caec6139 /init | |
| parent | cgroups: use flex_array in attach_proc (diff) | |
| download | linux-a77aea92010acf54ad785047234418d5d68772e2.tar.xz linux-a77aea92010acf54ad785047234418d5d68772e2.zip | |
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 45531757b45c ("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>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/init/Kconfig b/init/Kconfig index 332aac649966..ebafac4231ee 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -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 |