linux-kernel - Re: [PATCH 0/3] sched/fair: some fixes for asym

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Message-ID: <CAKfTPtAt4Lmyi6Cx6FGwBJEF8+V14L+N3HeiQRvnStQwmWjygA@mail.gmail.com>
Date:   Mon, 10 Sep 2018 14:40:02 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Valentin Schneider <valentin.schneider@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>
Subject: Re: [PATCH 0/3] sched/fair: some fixes for asym_packing

Hi,

On Tue, 7 Aug 2018 at 17:56, Vincent Guittot <vincent.guittot@...aro.org> wrote:
>
> During the review of misfit task patchset, Morten and Valentin raised some
> problems with the use of SD_ASYM_PACKING flag on asymetric system like
> hikey960 arm64 big/LITTLE platform. The study of the use cases has shown
> some problems that can happen for every systems that use the flag.
>
> The 3 patches fixes the problems raised for lmbench and the rt-app UC that
> creates 2 tasks that start as small tasks and then become suddenly always
> running tasks. (I can provide the rt-app json isf needed)

Gentle ping on this patchset

>
> Vincent Guittot (3):
>   sched/fair: fix rounding issue for asym packing
>   sched/fair: trigger asym_packing during idle load balance
>   sched/fair: fix unnecessary increase of balance interval
>
>  kernel/sched/fair.c | 33 +++++++++++++++++++++++++--------
>  1 file changed, 25 insertions(+), 8 deletions(-)
>
> --
> 2.7.4
>