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

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Message-ID: <20170207150610.k7aptdiqtpxqd6dp@pd.tnic>
Date:   Tue, 7 Feb 2017 16:06:10 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Robert Richter <rric@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vince Weaver <vince@...ter.net>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] perf/stat: Add --disable-hwdt

Btw,

I'm wondering if, alternatively, we add this to the manpage of perf stat
and be done with it:

"Remember to turn off HW watchdog temporarily as it is taking up one hw
counter:

$ echo  0 > /proc/sys/kernel/nmi_watchdog
 ... perf workload
$ echo  1 > /proc/sys/kernel/nmi_watchdog

in case some of the specified events don't get counted."

This solves the problem rather simply :-)))

-- 
Regards/Gruss,
    Boris.

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