linux-kernel - Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

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Message-ID: <4F95E4EF.2080802@sssup.it>
Date:	Tue, 24 Apr 2012 00:25:35 +0100
From:	Tommaso Cucinotta <tommaso.cucinotta@...up.it>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, rostedt@...dmis.org, cfriesen@...tel.com,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	nicola.manica@...i.unitn.it, luca.abeni@...tn.it,
	dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...csson.com, liming.wang@...driver.com
Subject: Re: [PATCH 05/16] sched: SCHED_DEADLINE policy implementation.

Il 23/04/2012 22:45, Peter Zijlstra ha scritto:
> On Mon, 2012-04-23 at 22:25 +0100, Tommaso Cucinotta wrote:
>> I cannot get the real difference between rq->clock and rq->task_clock.
> One runs at wall-time (rq->clock) the other excludes time in irq-context
> and steal-time (rq->clock_task).
>
> The idea is that ->clock_task gives the time as observed by schedulable
> tasks and excludes other muck.

so clock_task might be better to compute the consumed budget at task 
deschedule, but for setting deadlines one period ahead in the future 
guess the regular wall-time rq->clock is the one to be used?

Thx,

     T.

-- 
Tommaso Cucinotta, Computer Engineering PhD, Researcher
ReTiS Lab, Scuola Superiore Sant'Anna, Pisa, Italy
Tel +39 050 882 024, Fax +39 050 882 003
http://retis.sssup.it/people/tommaso

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