linux-kernel - Re: [PATCH 1/3] sched/fair: Disable runtime

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Date:	Mon, 23 Jun 2014 14:58:23 +0400
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>,
	<tkhai@...dex.ru>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"Mike Galbraith" <umgwanakikbuti@...il.com>,
	Konstantin Khorenko <khorenko@...allels.com>
Subject: Re: [PATCH 1/3] sched/fair: Disable runtime_enabled on dying rq

В Пн, 23/06/2014 в 12:07 +0200, Peter Zijlstra пишет:
> On Tue, Jun 17, 2014 at 05:24:10PM +0400, Kirill Tkhai wrote:
> > @@ -3790,6 +3803,12 @@ static void __maybe_unused unthrottle_offline_cfs_rqs(struct rq *rq)
> >  		cfs_rq->runtime_remaining = 1;
> >  		if (cfs_rq_throttled(cfs_rq))
> >  			unthrottle_cfs_rq(cfs_rq);
> > +
> > +		/*
> > +		 * Offline rq is schedulable till cpu is completely disabled
> > +		 * in take_cpu_down(), so we prevent new cfs throttling here.
> > +		 */
> > +		cfs_rq->runtime_enabled = 0;
> 
> Does it make sense to clear this before calling unthrottle_cfs_rq()?
> Just to make sure they're in the right order..

This looks good for me. I'll test and resend.

> 
> >  	}
> >  }


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