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

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Message-ID: <1289579251.2084.316.camel@laptop>
Date:	Fri, 12 Nov 2010 17:27:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raistlin <raistlin@...ux.it>
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 Fri, 2010-11-12 at 17:15 +0100, Raistlin wrote:
> > 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? 

Correct, it wouldn't be. However since I expect a user to be mostly
interested in deltas between two readings, in which case it really
doesn't matter, does it?
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