linux-kernel - Re: [PATCH 09/13] sched: Add bandwidth management for sched

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Date:	Fri, 20 Dec 2013 13:26:11 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
	mingo@...hat.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,
	tommaso.cucinotta@...up.it, juri.lelli@...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@...il.com, liming.wang@...driver.com, jkacur@...hat.com
Subject: Re: [PATCH 09/13] sched: Add bandwidth management for sched_dl

On Fri, 20 Dec 2013 13:23:23 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> 	CPU 0			CPU 1
> 	-----			-----
>  sched_setattr()
>  dl_overflow()
>  cpus = __dl_span_weight()
> 
> 			  cpu_down()
> 			  raw_spin_lock()
>  raw_spin_lock() /* blocks */
> 
> 
> 			  overflow = __dl_overflow(cpus-1);
> 			  raw_spin_unlock();
> 
>  /* gets lock */
>  __dl_overflow(cpus) /* all OK! */

Forgot to add:

 /* new deadline commitment added here */

> 
> 
> 
> 			  /* cpus goes to cpus - 1 making
> 			     __dl_overflow() not OK anymore */
> 

			also should have stated:

			"__dl_overflow(cpus-1) not OK anymore"


-- Steve
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