linux-kernel - Re: [patch 09/16] sched: unthrottle cfs_rq(s) who ran out of quota at period refresh

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Message-ID: <1309252313.6701.177.camel@twins>
Date:	Tue, 28 Jun 2011 11:11:53 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	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 09/16] sched: unthrottle cfs_rq(s) who ran out of quota
 at period refresh

On Mon, 2011-06-27 at 21:40 -0700, Paul Turner wrote:
> >> +       if (unlikely(runtime_expires != cfs_b->runtime_expires))
> >> +               goto out_unlock;
> >
> > it might help to explain how, runtime_expires is taken from cfs_b after
> > calling __refill_cfs_bandwidth_runtime, and we're in the replenishment
> > timer, so nobody is going to be adding new runtime.
> >
> 
> Good idea -- thanks 

Aside from being a good idea, I'm genuinely puzzled by that part and
would love having it explained :-)
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