linux-kernel - Re: [PATCH] proc: Add RLIMIT_RTTIME to /proc/<pid>/limits

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Date:	Fri, 29 Feb 2008 07:32:01 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Michael Kerrisk <mtk.manpages@...il.com>,
	Eugene Teo <eugeneteo@...nel.sg>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] proc: Add RLIMIT_RTTIME to /proc/<pid>/limits

On Thu, Feb 28, 2008 at 04:21:40PM +0100, Peter Zijlstra wrote:
> 
> On Thu, 2008-02-28 at 16:12 +0100, Michael Kerrisk wrote:
> > Peter,
> > 
> > Could you please provide some text describing RLIMIT_RTTIMEfor the
> > getrlimit.2 man page.
> 
> The rlimit sets a timeout in [us] for SCHED_RR and SCHED_FIFO tasks.
> This time is measured between sleeps, so a schedule in RR or a
> preemption in either is not a sleep - the task needs to be dequeued and
> enqueued for the timer to reset.
> 
> Upon reaching the cur limit we start giving SIGXCPU every second, upon
> reaching the hard limit we give SIGKILL - matching RLIMIT_CPU.
> 
> Time is measured in tick granularity (for now).
> 
> > Cheers,
> > 
> > Michael
> > 
> > On Fri, Feb 8, 2008 at 4:10 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > >
> > > On Fri, 2008-02-08 at 22:59 +0800, Eugene Teo wrote:
> > > > RLIMIT_RTTIME was introduced to allow the user to set a runtime timeout on
> > > > real-time tasks: http://lkml.org/lkml/2007/12/18/218. This patch updates
> > > > /proc/<pid>/limits with the new rlimit.
> > >
> > > Ah, didn't know about that file, thanks!
> > >
> > > > Signed-off-by: Eugene Teo <eugeneteo@...nel.sg>
> > >
> > > Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Acked-by: Neil Horman <nhorman@...driver.com>


-- 
/****************************************************
 * Neil Horman <nhorman@...driver.com>
 * Software Engineer, Red Hat
 ****************************************************/
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