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

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Message-ID: <20140623100724.GU19860@laptop.programming.kicks-ass.net>
Date:	Mon, 23 Jun 2014 12:07:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <ktkhai@...allels.com>
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

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..

>  	}
>  }
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