linux-kernel - Re: [RFC PATCH 2/5] sched: Add NOHZ_STATS

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Message-ID: <CAKfTPtD13p-n9otxq23rQZZKUfA1r03bxYBSDtSdm5HbWX7H6Q@mail.gmail.com>
Date:   Wed, 3 Jan 2018 10:16:00 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Brendan Jackman <brendan.jackman@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>
Subject: Re: [RFC PATCH 2/5] sched: Add NOHZ_STATS_KICK

Hi Peter,

On 22 December 2017 at 21:42, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Dec 22, 2017 at 07:56:29PM +0100, Peter Zijlstra wrote:
>> Right; but I figured we'd try and do it 'right' and see how horrible it
>> is before we try and do funny things.
>
> So now it should have a 32ms tick for up to .5s when the system goes
> completely idle.
>
> No idea how bad that is..

I have tested your branch but the timer doesn't seem to fire correctly
because i can still see blocked load in the use case i have run.
I haven't found the reason yet