linux-kernel - Re: [patch 08/16] sched: throttle cfs_rq entities which exceed their local runtime

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Date:	Wed, 22 Jun 2011 12:41:12 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Nikhil Rao <ncrao@...gle.com>
Subject: Re: [patch 08/16] sched: throttle cfs_rq entities which exceed their
 local runtime

On Tue, Jun 21, 2011 at 12:16:57AM -0700, Paul Turner wrote:
> @@ -1505,7 +1559,17 @@ enqueue_task_fair(struct rq *rq, struct 
>  			break;
>  		cfs_rq = cfs_rq_of(se);
>  		enqueue_entity(cfs_rq, se, flags);
> +
> +		/*
> +		 * end evaluation on encountering a throttled cfs_rq
> +		 *
> +		 * note: in the case of encountering a throttled cfs_rq we will
> +		 * post the final h_nr_running decrement below.

You mean 'final h_nr_running increment' I suppose ?

> +		*/
> +		if (cfs_rq_throttled(cfs_rq))
> +			break;
>  		cfs_rq->h_nr_running++;
> +
>  		flags = ENQUEUE_WAKEUP;
>  	}
> 
> @@ -1513,11 +1577,15 @@ enqueue_task_fair(struct rq *rq, struct 
>  		cfs_rq = cfs_rq_of(se);
>  		cfs_rq->h_nr_running++;

Regards,
Bharata.
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