Quoting Jianwei Liao ([email protected]):
> hi all,
> I am using ckpt-v18, everything is fine.
> i have read some of the code of ckpt, but i was wondering that where does
> kernel module to stop the checkpointee? (something related to context?) i
> hope you can point me out how to find such stuff.
> Can i use SIGSTOPand SIGCONT to do such things?
> Thank you very much.
> Liao
Userspace should do this in advance by using the freezer cgroup. So
for instance if you are wanting to checkpoint /usr/bin/myapp, then
one way to do it is:
(terminal 1)
mkdir -p /cgroup
mount -t cgroup -o freezer freezer /cgroup
mkdir /cgroup/myapp
(terminal 2)
echo $$ > /cgroup/myapp/tasks
/usr/bin/myapp
(terminal 1)
echo FROZEN > /cgroup/myapp/freezer.state
pid=`pidof myapp`
checkpoint $pid > myapp.ckpt
echo THAWED > /cgroup/myapp/freezer.state
If the application hasn't been frozen using the freezer cgroup,
then sys_checkpoint() will return -EBUSY.
-serge
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