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Subject[RFC PATCH 0/4] Container Freezer: Reuse Suspend Freezer
NOTE: Due to problems with my MTA configuration two earlier attempts reached linux-pm
but not linux-kernel. Please cc linux-pm@lists.linux-foundation.org on replies.

This patchset is a prototype using the container infrastructure and
the swsusp freezer to freeze a group of tasks. I've merely taken Cedric's
patches, forward-ported them to 2.6.25-rc8-mm1 and done a small amount of
testing.

2 files are defined by the freezer subsystem in the container
filesystem :

* "freezer.freeze"

writing 1 will freeze all tasks and 0 unfreeze
reading will return the status of the freezer

* "freezer.kill"

writing <n> will send signal number <n> to all tasks

* Usage :

# mkdir /containers/freezer
# mount -t container -ofreezer freezer /containers/freezer
# mkdir /containers/freezer/0
# echo $some_pid > /containers/freezer/0/tasks

to get status of the freezer subsystem :

# cat /containers/freezer/0/freezer.freeze
RUNNING

to freeze all tasks in the container :

# echo 1 > /containers/freezer/0/freezer.freeze
# cat /containers/freezer/0/freezer.freeze
FREEZING
# cat /containers/freezer/0/freezer.freeze
FROZEN

to unfreeze all tasks in the container :

# echo 1 > /containers/freezer/0/freezer.freeze
# cat /containers/freezer/0/freezer.freeze
RUNNING

to kill all tasks in the container :

# echo 9 > /containers/freezer/0/freezer.kill

* Caveats:

- the FROZEN status is calculated and changed when the container
file "freezer.freeze" is read.
- frozen containers will be unfrozen when a system is resumed after
a suspend. This is addressed by the last patch.

* Series

Applies to 2.6.25-rc8-mm1

The first patches make the freezer available to all architectures
before implementing the freezer subsystem.

[RFC PATCH 1/4] Add TIF_FREEZE flag to all architectures
[RFC PATCH 2/4] Make refrigerator always available
[RFC PATCH 3/4] Implement freezer cgroup subsystem
[RFC PATCH 4/4] Skip frozen cgroups during power management resume

Each patch compiles, boots, and survives basic LTP containers and controllers
tests.

Comments are welcome.

Cheers,
-Matt Helsley

--


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