Messages in this thread | | | Date | Thu, 03 Apr 2008 14:03:16 -0700 | From | matthltc@us ... | Subject | [RFC PATCH 0/4] Container Freezer: Reuse Suspend Freezer |
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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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