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From: Peter Zijlstra <peterz@infradead.org>
To: Juri Lelli <juri.lelli@arm.com>
Cc: Luca Abeni <luca.abeni@unitn.it>, Kirill Tkhai <tkhai@yandex.ru>,
	Ingo Molnar <mingo@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Another SCHED_DEADLINE bug (with bisection and possible fix)
Date: Sat, 31 Jan 2015 10:56:59 +0100	[thread overview]
Message-ID: <20150131095659.GD32343@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <54CB5E56.9080506@arm.com>

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.

> 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.

  reply	other threads:[~2015-01-31  9:57 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-29 23:27 luca abeni
2015-01-04 22:51 ` Kirill Tkhai
2015-01-05 15:21   ` Luca Abeni
2015-01-05 23:07     ` Kirill Tkhai
2015-01-07  7:01       ` Luca Abeni
2015-01-07 12:29         ` Kirill Tkhai
2015-01-07 12:45           ` Luca Abeni
2015-01-07 13:04             ` Kirill Tkhai
2015-01-07 13:14               ` Luca Abeni
2015-01-09 11:15               ` Luca Abeni
2015-01-09 11:46                 ` Kirill Tkhai
2015-01-13  8:10           ` Juri Lelli
2015-01-13  9:26             ` Kirill Tkhai
2015-01-13 14:04               ` Peter Zijlstra
2015-01-14 12:43                 ` Kirill Tkhai
2015-01-15 11:23                   ` Luca Abeni
2015-01-15 12:23                     ` Peter Zijlstra
2015-01-15 13:35                       ` Luca Abeni
2015-01-28 14:08                         ` Peter Zijlstra
2015-01-28 14:40                           ` Luca Abeni
2015-01-30 10:25                           ` Luca Abeni
2015-01-30 10:35                           ` Juri Lelli
2015-01-31  9:56                             ` Peter Zijlstra [this message]
2015-02-02 11:31                               ` Juri Lelli
2015-02-02 13:57                               ` Luca Abeni
2015-02-04 14:34                           ` [tip:sched/core] sched/deadline: Fix deadline parameter modification handling tip-bot for Peter Zijlstra

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