linux-kernel - Re: [PATCHv2 1/1] perf/x86/intel: make error messages less confusing

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Message-ID: <20180905214707.GM27886@tassilo.jf.intel.com>
Date:   Wed, 5 Sep 2018 14:47:07 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Eduardo Valentin <eduval@...zon.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jia Zhang <qianyue.zj@...baba-inc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/1] perf/x86/intel: make error messages less confusing

On Wed, Sep 05, 2018 at 08:53:17AM -0700, Eduardo Valentin wrote:
> On Wed, Sep 05, 2018 at 10:52:12AM +0200, Peter Zijlstra wrote:
> > On Thu, Aug 23, 2018 at 08:07:32AM -0700, Eduardo Valentin wrote:
> > > On a system with X86_FEATURE_ARCH_PERFMON disabled
> > > and with a model not known by family PMU drivers,
> > > user gets a kernel message log like the following:
> > > [ 0.100114] Performance Events: unsupported p6 CPU model 85 no PMU driver, software events only.
> > > 
> > > The "unsupported .. CPU" part may be confusing for some
> > > users leading to wrong understanding that the kernel
> > > does not support the CPU model.
> > 
> > Send them back to first grade, such that they might learn to read?
> > 
> 
> :-)

I think it's a valid concern, I guess Eduardo actually has real people
who got confused.

-Andi