From: Valentin Schneider <valentin.schneider@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Morten Rasmussen <Morten.Rasmussen@arm.com>
Subject: Re: [PATCH v2 1/3] sched/fair: fix rounding issue for asym packing
Date: Wed, 19 Dec 2018 14:59:39 +0000 [thread overview]
Message-ID: <8ea1a96c-c2e0-cc3f-1cec-444706383e77@arm.com> (raw)
In-Reply-To: <CAKfTPtAprHq4YYdJ1gnuoAcNiVFpFPnxYv_=RS6pXs8aYpjcuA@mail.gmail.com>
On 19/12/2018 13:39, Vincent Guittot wrote:
[...]
>> I used that setup out of convenience for myself, but AFAICT that use-case
>> just stresses that issue.
>
> After looking at you UC in details, your problem comes from the wl=1
> for cpu0 whereas there is no running task.
> But wl!=0 without running task should not be possible since fdf5f3
> ("wsched/fair: Disable LB_BIAS by default")
>
> This explain the 1023 instead of 1022
>
>
True, I had a look at the trace and there doesn't seem to be any running
task on that CPU. That's a separate matter however - the rounding issues
can happen regardless of the wl values.
next prev parent reply other threads:[~2018-12-19 14:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-14 16:01 [PATCH v2 0/3] sched/fair: some fixes for asym_packing Vincent Guittot
2018-12-14 16:01 ` [PATCH v2 1/3] sched/fair: fix rounding issue for asym packing Vincent Guittot
2018-12-18 17:32 ` Valentin Schneider
2018-12-19 8:32 ` Vincent Guittot
2018-12-19 11:58 ` Valentin Schneider
2018-12-19 13:39 ` Vincent Guittot
2018-12-19 14:59 ` Valentin Schneider [this message]
2018-12-19 15:05 ` Vincent Guittot
2018-12-19 15:11 ` Valentin Schneider
2018-12-19 15:20 ` Vincent Guittot
2018-12-19 15:30 ` Valentin Schneider
2018-12-19 15:54 ` Vincent Guittot
2018-12-14 16:01 ` [PATCH v2 2/3] sched/fair: trigger asym_packing during idle load balance Vincent Guittot
2018-12-17 16:59 ` Valentin Schneider
2018-12-18 8:17 ` Vincent Guittot
2018-12-18 12:00 ` Valentin Schneider
2018-12-14 16:01 ` [PATCH v2 3/3] sched/fair: fix unnecessary increase of balance interval Vincent Guittot
2018-12-17 16:56 ` Valentin Schneider
2018-12-18 9:32 ` Vincent Guittot
2018-12-18 11:46 ` Valentin Schneider
2018-12-18 13:23 ` Vincent Guittot
2018-12-18 14:09 ` Valentin Schneider
2018-12-19 8:27 ` Vincent Guittot
2018-12-19 11:16 ` Valentin Schneider
2018-12-19 13:29 ` Vincent Guittot
2018-12-19 15:54 ` Valentin Schneider
2018-12-19 16:54 ` Vincent Guittot
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