This patchset is a prototype using the container infrastructure and the swsusp freezer to freeze a group of tasks. 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 unfreeze when a system is resumed after a suspend. This is addressed by the last patch. * Series The first patches make the freezer available to all architectures before implementing the freezer subsystem. - add the TIF_FREEZE flag to all archs - make refrigerator() available to all archs - implement freezer subsystem - do not unfreeze a frozen container when the system is resumed Comments are welcome. Thanks, C. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers