From: Juri Lelli <juri.lelli@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
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: Mon, 02 Feb 2015 11:31:40 +0000 [thread overview]
Message-ID: <54CF601C.2080202@arm.com> (raw)
In-Reply-To: <20150131095659.GD32343@twins.programming.kicks-ass.net>
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.
>
next prev parent reply other threads:[~2015-02-02 11:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-29 23:27 Another SCHED_DEADLINE bug (with bisection and possible fix) 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
2015-02-02 11:31 ` Juri Lelli [this message]
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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