linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Message-ID: <AANLkTikSrN_Ur24xd7XYJyV3H8Cv9kXyDeBUpahNJHBU@mail.gmail.com>
Date:	Tue, 16 Nov 2010 11:56:33 -0800
From:	Paul Menage <menage@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dhaval Giani <dhaval.giani@...il.com>,
	Lennart Poettering <mzxreary@...inter.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Tue, Nov 16, 2010 at 11:45 AM, Linus Torvalds
<torvalds@...ux-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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