linux-kernel - Re: [RFC PATCH 5/5] Add a Signal Control Group Subsystem

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Message-ID: <480F5321.9030008@fr.ibm.com>
Date:	Wed, 23 Apr 2008 17:17:53 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Matt Helsley <matthltc@...ibm.com>
CC:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Paul Menage <menage@...gle.com>,
	Oren Laadan <orenl@...columbia.edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	linux-pm@...ts.linux-foundation.org,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFC PATCH 5/5] Add a Signal Control Group Subsystem

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@...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. 
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