linux-stable.git/Documentation/cgroups/cgroups.txt, branch v3.6

cgroup: Update remount documentation

2012-07-17T18:10:52+00:00

Remounting support will be removed in the future (see
feature-removal-schedule.txt).  Discourage users from using it.

Signed-off-by: Daniel Wagner 
Signed-off-by: Tejun Heo 
Cc: Rob Landley 
Cc: Paul Menage 
Cc: Li Zefan 
Cc: Frederic Weisbecker 
Cc: KAMEZAWA Hiroyuki

cgroup: Remove populate() documentation

2012-07-09T16:56:23+00:00

This function was removed by 86f82d561864e902c70282b6f17cf590c0f34691.

Signed-off-by: Daniel Wagner 
Signed-off-by: Tejun Heo 
Cc: Rob Landley 
Cc: Paul Menage 
Cc: Li Zefan 
Cc: Frederic Weisbecker 
Cc: KAMEZAWA Hiroyuki

cgroup: remove hierarchy_mutex

2012-06-07T02:12:30+00:00

It was introduced for memcg to iterate cgroup hierarchy without
holding cgroup_mutex, but soon after that it was replaced with
a lockless way in memcg.

No one used hierarchy_mutex since that, so remove it.

Signed-off-by: Li Zefan 
Signed-off-by: Tejun Heo

cgroup: remove cgroup_subsys argument from callbacks

2012-02-02T17:20:22+00:00

The argument is not used at all, and it's not necessary, because
a specific callback handler of course knows which subsys it
belongs to.

Now only ->pupulate() takes this argument, because the handlers of
this callback always call cgroup_add_file()/cgroup_add_files().

So we reduce a few lines of code, though the shrinking of object size
is minimal.

 16 files changed, 113 insertions(+), 162 deletions(-)

   text    data     bss     dec     hex filename
5486240  656987 7039960 13183187         c928d3 vmlinux.o.orig
5486170  656987 7039960 13183117         c9288d vmlinux.o

Signed-off-by: Li Zefan 
Signed-off-by: Tejun Heo

cgroup: kill subsys->can_attach_task(), pre_attach() and attach_task()

2011-12-13T02:12:22+00:00

These three methods are no longer used.  Kill them.

Signed-off-by: Tejun Heo 
Reviewed-by: KAMEZAWA Hiroyuki 
Reviewed-by: Frederic Weisbecker 
Acked-by: Paul Menage 
Cc: Li Zefan

cgroup: introduce cgroup_taskset and use it in subsys->can_attach(), cancel_attach() and attach()

2011-12-13T02:12:21+00:00

Currently, there's no way to pass multiple tasks to cgroup_subsys
methods necessitating the need for separate per-process and per-task
methods.  This patch introduces cgroup_taskset which can be used to
pass multiple tasks and their associated cgroups to cgroup_subsys
methods.

Three methods - can_attach(), cancel_attach() and attach() - are
converted to use cgroup_taskset.  This unifies passed parameters so
that all methods have access to all information.  Conversions in this
patchset are identical and don't introduce any behavior change.

-v2: documentation updated as per Paul Menage's suggestion.

Signed-off-by: Tejun Heo 
Reviewed-by: KAMEZAWA Hiroyuki 
Reviewed-by: Frederic Weisbecker 
Acked-by: Paul Menage 
Acked-by: Li Zefan 
Cc: Balbir Singh 
Cc: Daisuke Nishimura 
Cc: KAMEZAWA Hiroyuki 
Cc: James Morris

Documentation: update cgroups notes

2011-11-04T19:01:46+00:00

- ns cgroup has been removed.
- it's true moving a task to another cgroup can fail.

Signed-off-by: Li Zefan 
Acked-by: Paul Menage 
Signed-off-by: Randy Dunlap 
Signed-off-by: Linus Torvalds

Documentation: fix cgroup typos and formatting

2011-06-16T04:52:50+00:00

Fix format and spelling.

Signed-off-by: Jörg Sommer 
Acked-by: Paul Menage 
Signed-off-by: Randy Dunlap 
Signed-off-by: Linus Torvalds

Documentation: update cgroupfs mount point

2011-06-16T04:52:50+00:00

According to commit 676db4af0430 ("cgroupfs: create /sys/fs/cgroup to
mount cgroupfs on") the canonical mountpoint for the cgroup filesystem
is /sys/fs/cgroup.  Hence, this should be used in the documentation.

Signed-off-by: Jörg Sommer 
Acked-by: Paul Menage 
Signed-off-by: Randy Dunlap 
Signed-off-by: Linus Torvalds

cgroup: remove the ns_cgroup

2011-05-27T00:12:34+00:00

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 
Signed-off-by: Serge E. Hallyn 
Cc: Eric W. Biederman 
Cc: Jamal Hadi Salim 
Reviewed-by: Li Zefan 
Acked-by: Paul Menage 
Acked-by: Matt Helsley 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds