linux-kernel - Re: [patch 08/18] sched: add support for throttling group entities

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Date:	Mon, 8 Aug 2011 23:46:15 +0800
From:	Lin Ming <minggr@...il.com>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <bsingharora@...il.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>,
	Jason Baron <jbaron@...hat.com>
Subject: Re: [patch 08/18] sched: add support for throttling group entities

On Fri, Jul 22, 2011 at 12:43 AM, Paul Turner <pjt@...gle.com> wrote:

> +static __used void throttle_cfs_rq(struct cfs_rq *cfs_rq)
> +{
> +       struct rq *rq = rq_of(cfs_rq);
> +       struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
> +       struct sched_entity *se;
> +       long task_delta, dequeue = 1;
> +
> +       se = cfs_rq->tg->se[cpu_of(rq_of(cfs_rq))];
> +
> +       /* account load preceding throttle */
> +       update_cfs_load(cfs_rq, 0);
> +
> +       task_delta = cfs_rq->h_nr_running;
> +       for_each_sched_entity(se) {
> +               struct cfs_rq *qcfs_rq = cfs_rq_of(se);
> +               /* throttled entity or throttle-on-deactivate */
> +               if (!se->on_rq)
> +                       break;

Does it mean it's possible that child se is unthrottled but parent se
is throttled?

I thought if parent group was throttled then its children should be
throttled too.
I may misunderstood the code, please correct me then.

Thanks,
Lin Ming
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