linux-kernel - Re: [RFC][PATCH] sched: SCHED

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Message-ID: <20071015142546.GA7851@tango.0pointer.de>
Date:	Mon, 15 Oct 2007 16:25:46 +0200
From:	Lennart Poettering <mzxreary@...inter.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>
Subject: Re: [RFC][PATCH] sched: SCHED_FIFO watchdog timer

On Sun, 14.10.07 00:51, Peter Zijlstra (a.p.zijlstra@...llo.nl) wrote:

> The below patch is an idea proposed by tglx and depends on sched-devel +
> the hrtick patch previously posted.
> 
> The current watchdog action is to demote the task to SCHED_NORMAL,
> however it might be wanted to deliver a signal instead (or have more per
> task configuration state). Which is why I added Lennart to the CC list
> as I gathered he would like something like this for PulseAudio.

Indeed! Having this in the kernel would allow us to enable RT
scheduling for PulseAudio by default without bad effects. I was thinking about
adding some kind of babysitting process to userspace -- but doing this as
an RLIMIT in the kernel strikes me a much better idea!

I think it would make a lot of sense to make the API very similar to
RLIMIT_CPU, i.e. also send out SIGXCPU and SIGKILL, with the single
difference that RLIMIT_CPU sends out a signal depending on the total
CPU time used for the process and the new RLIMIT based on the time the
process spent without sleeping. That would be a very reasonable
extension to the current RLIMIT_CPU model.

Thank you very much for doing this patch!

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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