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Matt Helsley dc52ddc0e6 container freezer: implement freezer cgroup subsystem ... This patch implements a new freezer subsystem in the control groups framework. It provides a way to stop and resume execution of all tasks in a cgroup by writing in the cgroup filesystem. The freezer subsystem in the container filesystem defines a file named freezer.state. Writing "FROZEN" to the state file will freeze all tasks in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in the cgroup. Reading will return the current state. * Examples of usage : # mkdir /containers/freezer # mount -t cgroup -ofreezer freezer /containers # mkdir /containers/0 # echo $some_pid > /containers/0/tasks to get status of the freezer subsystem : # cat /containers/0/freezer.state RUNNING to freeze all tasks in the container : # echo FROZEN > /containers/0/freezer.state # cat /containers/0/freezer.state FREEZING # cat /containers/0/freezer.state FROZEN to unfreeze all tasks in the container : # echo RUNNING > /containers/0/freezer.state # cat /containers/0/freezer.state RUNNING This is the basic mechanism which should do the right thing for user space task in a simple scenario. It's important to note that freezing can be incomplete. In that case we return EBUSY. This means that some tasks in the cgroup are busy doing something that prevents us from completely freezing the cgroup at this time. After EBUSY, the cgroup will remain partially frozen -- reflected by freezer.state reporting "FREEZING" when read. The state will remain "FREEZING" until one of these things happens: 1) Userspace cancels the freezing operation by writing "RUNNING" to the freezer.state file 2) Userspace retries the freezing operation by writing "FROZEN" to the freezer.state file (writing "FREEZING" is not legal and returns EIO) 3) The tasks that blocked the cgroup from entering the "FROZEN" state disappear from the cgroup's set of tasks. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: export thaw_process] Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Tested-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>		17 years ago
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alpha	container freezer: implement freezer cgroup subsystem	17 years ago
arm	container freezer: implement freezer cgroup subsystem	17 years ago
avr32	container freezer: implement freezer cgroup subsystem	17 years ago
blackfin	container freezer: implement freezer cgroup subsystem	17 years ago
cris	container freezer: implement freezer cgroup subsystem	17 years ago
frv	container freezer: implement freezer cgroup subsystem	17 years ago
h8300	container freezer: implement freezer cgroup subsystem	17 years ago
ia64	container freezer: implement freezer cgroup subsystem	17 years ago
m32r	container freezer: implement freezer cgroup subsystem	17 years ago
m68k	container freezer: implement freezer cgroup subsystem	17 years ago
m68knommu	container freezer: implement freezer cgroup subsystem	17 years ago
mips	container freezer: implement freezer cgroup subsystem	17 years ago
mn10300	container freezer: implement freezer cgroup subsystem	17 years ago
parisc	container freezer: implement freezer cgroup subsystem	17 years ago
powerpc	container freezer: implement freezer cgroup subsystem	17 years ago
s390	container freezer: implement freezer cgroup subsystem	17 years ago
sh	container freezer: implement freezer cgroup subsystem	17 years ago
sparc	container freezer: implement freezer cgroup subsystem	17 years ago
sparc64	container freezer: implement freezer cgroup subsystem	17 years ago
um	container freezer: implement freezer cgroup subsystem	17 years ago
x86	container freezer: implement freezer cgroup subsystem	17 years ago
xtensa	container freezer: implement freezer cgroup subsystem	17 years ago
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