linux-kernel - Re: [PATCH] turbostat: Running on virtual machine is not supported

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Message-ID: <20170725155911.ihtjkz5cuwdpwoxp@khazad-dum.debian.net>
Date:   Tue, 25 Jul 2017 12:59:11 -0300
From:   Henrique de Moraes Holschuh <hmh@....eng.br>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] turbostat: Running on virtual machine is not supported

On Tue, 25 Jul 2017, Prarit Bhargava wrote:
> A common way of determining if the system is a virtual machine is to
> search /proc/cpuinfo flags entry for "hypervisor".  turbostat must output
> a proper error message when found.

Maybe you could output that message only if it fails to both use
/dev/msr and perf *and* it is under a virtual machine?  That would have
better forward compatibility, maybe someday /dev/msr or perf will work
inside a VM for what turbostat needs...

-- 
  Henrique Holschuh