linux-kernel - Re: [RFC PATCH 1/1] perf tools: Add 'm' event modifier for counting machine

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Message-ID: <CAOnJCUKVGZ=ixXJb3d--JKA8DqSvHq4bnV9A1z4YPiQzDjzXHQ@mail.gmail.com>
Date:   Tue, 11 Jan 2022 10:59:43 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Nikita Shubin <nikita.shubin@...uefel.me>,
        Atish Patra <atishp@...osinc.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux <linux@...ro.com>, Nikita Shubin <n.shubin@...ro.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Song Liu <song@...nel.org>, linux-perf-users@...r.kernel.org,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/1] perf tools: Add 'm' event modifier for counting machine

On Tue, Jan 11, 2022 at 10:53 AM Andi Kleen <ak@...ux.intel.com> wrote:
>
>
> >
> >    u - user-space counting
> >    k - kernel counting
> > + m - machine counting
>
>
> You really need to explain what "machine counting" actually is, as well
> that is likely irrelevant for most CPUs.
>

Ideally, this should firmware counting instead of "machine counting"
which is a RISC-V specific terminology
(Machine mode is highest privilege mode similar to EL3 in ARM where
the firmware runs)

> I also didn't see that anywhere in the commit logs.
>
> -Andi
>
>
> _______________________________________________
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> linux-riscv@...ts.infradead.org
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-- 
Regards,
Atish

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