linux-kernel - Re: [CFS Bandwidth Control v4 3/7] sched: throttle cfs_rq entities which exceed their local quota

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Message-ID: <20110218065224.GD2648@balbir.in.ibm.com>
Date:	Fri, 18 Feb 2011 12:22:24 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Avi Kivity <avi@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Nikhil Rao <ncrao@...gle.com>
Subject: Re: [CFS Bandwidth Control v4 3/7] sched: throttle cfs_rq entities
 which exceed their local quota

* Paul Turner <pjt@...gle.com> [2011-02-15 19:18:34]:

> In account_cfs_rq_quota() (via update_curr()) we track consumption versus a
> cfs_rq's local quota and whether there is global quota available to continue
> enabling it in the event we run out.
> 
> This patch adds the required support for the latter case, throttling entities
> until quota is available to run.  Throttling dequeues the entity in question
> and sends a reschedule to the owning cpu so that it can be evicted.
> 
> The following restrictions apply to a throttled cfs_rq:
> - It is dequeued from sched_entity hierarchy and restricted from being
>   re-enqueued.  This means that new/waking children of this entity will be
>   queued up to it, but not past it.
> - It does not contribute to weight calculations in tg_shares_up
> - In the case that the cfs_rq of the cpu we are trying to pull from is throttled
>   it is  is ignored by the loadbalancer in __load_balance_fair() and
>   move_one_task_fair().
> 
> Signed-off-by: Paul Turner <pjt@...gle.com>
> Signed-off-by: Nikhil Rao <ncrao@...gle.com>
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>


Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
 
-- 
	Three Cheers,
	Balbir
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