From: Matt Fleming <matt@codeblueprint.co.uk>
To: Wanpeng Li <kernellwp@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
Yuyang Du <yuyang.du@intel.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>
Subject: Re: [PATCH] sched/fair: Do not decay new task load on first enqueue
Date: Tue, 11 Oct 2016 11:27:47 +0100 [thread overview]
Message-ID: <20161011102747.GB16071@codeblueprint.co.uk> (raw)
In-Reply-To: <CANRm+CxGHVoJO6i1Yjcqk_njTgPiZKK2_EJ3f8nsKN92is0dsQ@mail.gmail.com>
On Mon, 10 Oct, at 06:09:14PM, Wanpeng Li wrote:
> 2016-10-10 18:01 GMT+08:00 Matt Fleming <matt@codeblueprint.co.uk>:
> > On Sun, 09 Oct, at 11:39:27AM, Wanpeng Li wrote:
> >>
> >> The difference between this patch and Peterz's is your patch have a
> >> delta since activate_task()->enqueue_task() does do update_rq_clock(),
> >> so why don't have the delta will cause low cpu machines (4 or 8) to
> >> regress against your another reply in this thread?
> >
> > Both my patch and Peter's patch cause issues with low cpu machines. In
> > <20161004201105.GP16071@codeblueprint.co.uk> I said,
> >
> > "This patch causes some low cpu machines (4 or 8) to regress. It turns
> > out they regress with my patch too."
> >
> > Have I misunderstood your question?
>
> I compare this one https://marc.info/?l=linux-kernel&m=147446511924571
> with Peterz's patch.
Oh. Low cpu machines probably do regress with my patch. At least, I
can't find the notes to prove that they don't.
next prev parent reply other threads:[~2016-10-11 10:28 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-23 11:58 [PATCH] sched/fair: Do not decay new task load on first enqueue Matt Fleming
2016-09-23 14:30 ` Vincent Guittot
2016-09-27 13:48 ` Dietmar Eggemann
2016-09-27 19:24 ` Matt Fleming
2016-09-27 19:21 ` Matt Fleming
2016-09-28 10:14 ` Peter Zijlstra
2016-09-28 11:06 ` Dietmar Eggemann
2016-09-28 11:19 ` Peter Zijlstra
2016-09-28 11:31 ` Dietmar Eggemann
2016-09-28 11:46 ` Vincent Guittot
2016-09-28 12:00 ` Vincent Guittot
2016-10-04 21:25 ` Matt Fleming
2016-10-04 20:16 ` Matt Fleming
2016-09-28 12:27 ` Vincent Guittot
2016-09-28 13:13 ` Vincent Guittot
2016-09-29 16:15 ` Dietmar Eggemann
2016-10-03 13:05 ` Vincent Guittot
2016-09-28 17:59 ` Dietmar Eggemann
2016-09-28 19:37 ` Matt Fleming
2016-09-30 20:30 ` Matt Fleming
2016-10-09 3:39 ` Wanpeng Li
2016-10-10 10:01 ` Matt Fleming
2016-10-10 10:09 ` Wanpeng Li
2016-10-11 10:27 ` Matt Fleming [this message]
2016-10-10 12:29 ` Vincent Guittot
2016-10-10 13:54 ` Dietmar Eggemann
2016-10-10 18:29 ` Vincent Guittot
2016-10-11 9:44 ` Dietmar Eggemann
2016-10-11 10:39 ` Matt Fleming
2016-10-18 10:11 ` Matt Fleming
2016-10-10 17:34 ` Vincent Guittot
2016-10-11 10:24 ` Matt Fleming
2016-10-11 13:14 ` Vincent Guittot
2016-10-11 18:57 ` Matt Fleming
2016-10-12 7:41 ` Vincent Guittot
2016-10-18 11:09 ` Peter Zijlstra
2016-10-18 15:19 ` Vincent Guittot
2016-10-18 10:29 ` Matt Fleming
2016-10-18 11:10 ` Peter Zijlstra
2016-10-18 11:29 ` Matt Fleming
2016-10-18 12:15 ` Peter Zijlstra
2016-10-19 6:38 ` Vincent Guittot
2016-10-19 9:53 ` Peter Zijlstra
2016-11-09 16:53 ` Vincent Guittot
2016-10-04 20:11 ` Matt Fleming
2016-10-09 5:57 ` [sched/fair] f54c5d4e28: hackbench.throughput 10.6% improvement kernel test robot
2016-10-09 5:57 ` [lkp] " kernel test robot
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