linux-kernel - Re: [PATCH] sched/rt: RT_RUNTIME

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Message-ID: <alpine.DEB.2.20.1611081742180.22679@east.gentwo.org>
Date:   Tue, 8 Nov 2016 17:42:38 -0600 (CST)
From:   Christoph Lameter <cl@...ux.com>
To:     Steven Rostedt <rostedt@...dmis.org>
cc:     Daniel Bristot de Oliveira <daniel@...stot.me>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature

On Mon, 7 Nov 2016, Steven Rostedt wrote:

> On Mon, 7 Nov 2016 21:06:50 +0100
> Daniel Bristot de Oliveira <daniel@...stot.me> wrote:
>
> > The throttling allowed the kworker to run, but once the kworker went to
> > sleep, the RT tasks started to work again. In the previous behavior,
> > the system would either go idle, or the kworker would starve because
> > the runtime become infinity for RR tasks.
>
> I'm confused? Are you saying that RR tasks don't get throttled in the
> current code? That sounds like a bug to me.

Good. Thats what I wanted to hear after all these justifications that the
system is just behaving as designed.