linux-kernel - Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

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Message-ID: <alpine.DEB.2.20.1712191123150.18938@nuc-kabylake>
Date:   Tue, 19 Dec 2017 11:26:35 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Frederic Weisbecker <frederic@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Wanpeng Li <kernellwp@...il.com>,
        Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick
 offload

On Tue, 19 Dec 2017, Peter Zijlstra wrote:

> On Tue, Dec 19, 2017 at 10:38:39AM -0600, Christopher Lameter wrote:
> > And the term RT has been heavily abused by marketing folks to mean any
> > number of things so people can use RT to refer to variety of things. So
> > please always clarify what you mean exactly.
>
> Do not _ever_ listen to marketing... Also your argument is circular, you
> cannot state clearly what is meant if every word means something else to
> others.

As Goedel has shown every logical must ultimately circular. The circle has
to be widened enough to include terms whose meaning is agreed upon by all
involved parties so that a common understanding can be reached.

Marketing speak is valid in a certain business context and has some
meaning that are often offensive to us since it does not map clearly to
our engineering concepts and strict definitions that we like.
Nevertheless lots of users use the terms in the marketing sense and
engineers get sucked into other meanings of words.