[RFC PATCH 5/5] Add a Signal Control Group Subsystem

[Cedric Le Goater]

Hello Matt !

> Add a signal control group subsystem that allows us to send signals to all tasks
> in the control group by writing the desired signal(7) number to the kill file.
> 
> NOTE: We don't really need per-cgroup state, but control groups doesn't support
> stateless subsystems yet.
> 
> Signed-off-by: Matt Helsley <matthltc at us.ibm.com>
> ---
>  include/linux/cgroup_signal.h |   28 +++++++++
>  include/linux/cgroup_subsys.h |    6 +
>  init/Kconfig                  |    6 +
>  kernel/Makefile               |    1 
>  kernel/cgroup_signal.c        |  129 ++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 170 insertions(+)


I think there is a small race with new tasks entering the cgroup
while it's beeing killed, and a _fork ops would handle that. nop ? 

Thanks,

C.