linux-kernel - Re: [RFC][PATCH 12/22] sched: add runtime reporting for -deadline tasks

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Message-ID: <1289578543.6525.535.camel@Palantir>
Date:	Fri, 12 Nov 2010 17:15:43 +0100
From:	Raistlin <raistlin@...ux.it>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 12/22] sched: add runtime reporting for -deadline
 tasks

On Thu, 2010-11-11 at 20:37 +0100, Peter Zijlstra wrote:
> > -#ifdef CONFIG_SCHEDSTATS
> >  struct sched_stats_dl {
> > +#ifdef CONFIG_SCHEDSTATS
> >  	u64			last_dmiss;
> >  	u64			last_rorun;
> >  	u64			dmiss_max;
> >  	u64			rorun_max;
> > -};
> >  #endif
> > +	u64			tot_rtime;
> > +};
> >  
> 
> I know we agreed to pull this from the sched_param2 structure and delay
> exposing this information for a while until the base patches got merged
> and came up with a solid use-case, 
>
Sure! :-)

> but reading this patch makes me
> wonder why tsk->se.sum_exec_runtime isn't good enough?
>
Might be, but what you usually want is something reporting you total
runtime from when you became a -deadline task, which may not be the case
of sum_exec_runtime, is it?

BTW, again, let's postpone this.

Thanks,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@...ga.net /
dario.faggioli@...ber.org

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