linux-kernel - Re: [PATCH 3/3] tools/power turbostat: allow turbostat to work when aperf is not available

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Message-ID: <CAJvTdK=g191mjf3uhXTemZCfoc2iQWSE0n8QtFewvMmCbEojgg@mail.gmail.com>
Date: Mon, 1 Dec 2025 14:53:28 -0500
From: Len Brown <lenb@...nel.org>
To: David Arcari <darcari@...hat.com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] tools/power turbostat: allow turbostat to work when
 aperf is not available

> ...add_msr_perf_counter() returns -1

good.  and then add_msr_counter() succeeds because...

> rdmsr returns zero for MSR_IA32_APERF and MSR_IA32_MPERF.

Your patch is a good suggestion -- though it checks for APERF only and
not for MPERF.

We already ran CPUID and cleared has_aperf, so I'm thinking we should
be heading this off earlier.  Let me send you a test patch later today.

thanks,
Len Brown, Intel Open Source Technology Center