linux-kernel - Re: Another SCHED_DEADLINE bug (with bisection and possible fix)

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Date:	Mon, 02 Feb 2015 11:31:40 +0000
From:	Juri Lelli <juri.lelli@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Luca Abeni <luca.abeni@...tn.it>, Kirill Tkhai <tkhai@...dex.ru>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Another SCHED_DEADLINE bug (with bisection and possible fix)

On 31/01/2015 09:56, Peter Zijlstra wrote:
> On Fri, Jan 30, 2015 at 10:35:02AM +0000, Juri Lelli wrote:
>> So, we do the safe thing only in case of throttling.
> 
> No, even for the !throttle aka running tasks. We only use
> dl_{runtime,deadline,period} for replenishment, until that time we
> observe the old runtime/deadline set by the previous replenishment.
> 

Oh, right. We set dl_new in __dl_clear_params(), nice.

Thanks,

- Juri

>> I guess is more than
>> ok for now, while we hopefully find some spare cycle to implement a
>> complete solution :/.
> 
> Yeah, I bet the fun part is computing the 0-lag across the entire root
> domain, per-cpu 0-lag isn't correct afaict.
> 

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