linux-kernel - Re: [RFC PATCH] perf/stat: Add --disable-hwdt

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Date:   Mon, 6 Feb 2017 09:23:33 -0500 (EST)
From:   Vince Weaver <vince@...ter.net>
To:     Robert Richter <rric@...nel.org>
cc:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] perf/stat: Add --disable-hwdt

On Mon, 6 Feb 2017, Robert Richter wrote:

> On 06.02.17 13:49:37, Borislav Petkov wrote:
> > On Mon, Feb 06, 2017 at 01:44:48PM +0100, Ingo Molnar wrote:
> > > Yeah, if for some whatever reason perf locks up while running perf stat as root, 
> > > so I'd keep the option, as a general principle. :-/
> > 
> > --dont-disable-hwdt it is.
> 
> Isn't there the danger the previous watchdog state is never restored
> if for some reason perf got killed? So maybe have some other task
> running that restores it once perf is gone.

minor issue, but is it possibly to do anything about dmesg spam?  From 
what I recall every time you enable and disable the watchdog the kernel 
prints a message.  Makes for messy logs, especially when you run the 
perf_fuzzer as root.

Vince