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From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Brendan Jackman <brendan.jackman@arm.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Morten Rasmussen <morten.rasmussen@arm.com>
Subject: Re: [RFC PATCH 2/5] sched: Add NOHZ_STATS_KICK
Date: Fri, 22 Dec 2017 09:29:15 +0100	[thread overview]
Message-ID: <20171222082915.4lcb7xyyooqyjpia@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKfTPtC0+5zjvgNXMyVcvnnyJh0giQgJHtx+5p-GEpjUW1x8eg@mail.gmail.com>

On Fri, Dec 22, 2017 at 09:05:45AM +0100, Vincent Guittot wrote:
> On 22 December 2017 at 08:59, Peter Zijlstra <peterz@infradead.org> wrote:
> > On Thu, Dec 21, 2017 at 05:56:32PM +0100, Vincent Guittot wrote:
> >> In fact, we can't only rely on the tick and newly_idle load balance to
> >> ensure a period update of the blocked load because they can never
> >> happen.
> >
> > I'm confused, why would the ilb not happen?
> 
> the ilb will be kick only if tick fires which might not be the case
> for task that runs less than a tick

Oh, urgh, you're talking about when the entire system is idle. Yes
indeed.

Lemme have a think, surely we can do something saner there.

  reply	other threads:[~2017-12-22  8:29 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-21 10:21 [RFC PATCH 0/5] sched: On remote stats updates Peter Zijlstra
2017-12-21 10:21 ` [RFC PATCH 1/5] sched: Convert nohz_flags to atomic_t Peter Zijlstra
2017-12-21 10:21 ` [RFC PATCH 2/5] sched: Add NOHZ_STATS_KICK Peter Zijlstra
2017-12-21 16:23   ` Vincent Guittot
2017-12-21 16:56     ` Vincent Guittot
2017-12-22  7:59       ` Peter Zijlstra
2017-12-22  8:05         ` Vincent Guittot
2017-12-22  8:29           ` Peter Zijlstra [this message]
2017-12-22  9:12             ` Peter Zijlstra
2017-12-22 14:31               ` Peter Zijlstra
2017-12-22 14:34                 ` Vincent Guittot
2017-12-22 14:32               ` Vincent Guittot
2017-12-22 18:56                 ` Peter Zijlstra
2017-12-22 20:42                   ` Peter Zijlstra
2018-01-02 15:44                     ` Morten Rasmussen
2018-01-15  9:43                       ` Peter Zijlstra
2018-01-18 10:32                         ` Morten Rasmussen
2018-01-03  9:16                     ` Vincent Guittot
2018-01-15  8:26                       ` Vincent Guittot
2018-01-18 10:38                         ` Morten Rasmussen
2018-01-24  8:25                           ` Vincent Guittot
2018-01-29 18:43                             ` Dietmar Eggemann
2018-01-30  8:00                               ` Vincent Guittot
2018-01-29 19:31                             ` Valentin Schneider
2018-01-30  8:32                               ` Vincent Guittot
2018-01-30 11:41                                 ` Valentin Schneider
2018-01-30 13:05                                   ` Vincent Guittot
2018-02-05 22:18                                   ` Valentin Schneider
2018-02-06  9:22                                     ` Vincent Guittot
2018-02-01 18:16                               ` Peter Zijlstra
2018-02-01 16:57                             ` Peter Zijlstra
2018-02-01 17:26                               ` Vincent Guittot
2018-02-01 18:10                             ` Peter Zijlstra
2018-02-01 19:11                               ` Vincent Guittot
2018-02-06  8:32                               ` [PATCH 1/3] sched: Stop nohz stats when decayed Vincent Guittot
2018-02-06  8:32                                 ` [PATCH 2/3] sched: reduce the periodic update duration Vincent Guittot
2018-02-06  8:32                                 ` [PATCH 3/3] sched: update blocked load when newly idle Vincent Guittot
2018-02-06 14:32                                   ` Valentin Schneider
2018-02-06 16:17                                     ` Vincent Guittot
2018-02-06 16:32                                       ` Valentin Schneider
2018-02-06  8:55                                 ` [PATCH 1/3] sched: Stop nohz stats when decayed Vincent Guittot
2018-02-06 14:16                                 ` Valentin Schneider
2018-02-06 14:31                                   ` Vincent Guittot
2018-02-01 16:55                           ` [RFC PATCH 2/5] sched: Add NOHZ_STATS_KICK Peter Zijlstra
2018-01-22  9:40                         ` Dietmar Eggemann
2018-01-22 10:23                           ` Vincent Guittot
2018-02-01 16:52                         ` Peter Zijlstra
2018-02-01 17:25                           ` Vincent Guittot
2017-12-22  7:56     ` Peter Zijlstra
2017-12-22  8:04       ` Vincent Guittot
2017-12-21 10:21 ` [RFC PATCH 3/5] sched: Restructure nohz_balance_kick Peter Zijlstra
2017-12-21 10:21 ` [RFC PATCH 4/5] sched: Add nohz stats balancing Peter Zijlstra
2017-12-21 10:21 ` [RFC PATCH 5/5] sched: Update blocked load from NEWIDLE Peter Zijlstra

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