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From: Paul Menage <menage@google.com>
Date: Tue, 16 Nov 2010 11:56:33 -0800
Message-ID: <AANLkTikSrN_Ur24xd7XYJyV3H8Cv9kXyDeBUpahNJHBU@mail.gmail.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dhaval Giani <dhaval.giani@gmail.com>,
        Lennart Poettering <mzxreary@0pointer.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Mike Galbraith <efault@gmx.de>, Vivek Goyal <vgoyal@redhat.com>,
        Oleg Nesterov <oleg@redhat.com>,
        Markus Trippelsdorf <markus@trippelsdorf.de>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
        Balbir Singh <balbir@linux.vnet.ibm.com>
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On Tue, Nov 16, 2010 at 11:45 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> In a system daemon? Good luck with that. It's a nightmare. Maybe you
> could just poll all the cgroups, and try to remove them once a minute,
> and if they are empty it works. Or something like that. But what a
> hacky thing it would be.

There's an existing cgroups API - release_agent and notify_on_release
- whereby the kernel will spawn a userspace command once a given
cgroup is completely empty. It's intended for pretty much exactly this
purpose.

Paul
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