linux-kernel - Re: [PATCH] cpufreq: schedutil: Always trace frequency if it does not change

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Message-ID: <20170322142116.qpe2faqwbmlmhft7@hirez.programming.kicks-ass.net>
Date:   Wed, 22 Mar 2017 15:21:16 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] cpufreq: schedutil: Always trace frequency if it does
 not change

On Wed, Mar 22, 2017 at 01:52:04PM +0100, Rafael J. Wysocki wrote:
> On Wed, Mar 22, 2017 at 10:29 AM, Peter Zijlstra <peterz@...radead.org> wrote:

> > So why not fix the tools?
> 
> Because I can't.
> 
> I just can't go and fix all of the tools binaries that people use out
> there and I want them to use recent kernels at the same time.
> 

Thing is; you're now letting random tracepoint user dictate kernel
implementation. That's a bad state to be in.

(and why I hate tracepoint to begin with)