linux-kernel - Re: [RFC PATCH 0/1] perf tools: Add 'm' event modifier for counting

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Date:   Tue, 11 Jan 2022 14:29:15 +0000
From:   Jessica Clarke <jrtc27@...c27.com>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     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>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Song Liu <song@...nel.org>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/1] perf tools: Add 'm' event modifier for counting

On 11 Jan 2022, at 14:20, Nikita Shubin <nikita.shubin@...uefel.me> wrote:
> 
> From: Nikita Shubin <n.shubin@...ro.com>
> 
> This patch is a proposal to add Machine Mode modifier that is currently 
> available only for RISC-V for perf tool.
> 
> We don't currently have a level that is lower than kernel, so i don't 
> see we can reuse something existing for this purpose.
> 
> The exclude_machine bit seems harmless to as no one will proccess it apart 
> of riscv.

Armv8 has equivalent bits in PMEVTYPER<n>_EL0 and PMCCFILTR_EL0 for
EL-based filtering, which includes filtering EL3.

Jess

> Patch depends on Atish Patra PMU series:
> https://lwn.net/Articles/879905/
> + some modifications to pass execlude event to SBI PMU extension
> 
> Tested with qemu.
> 
> Nikita Shubin (1):
>  perf tools: Add 'm' event modifier for counting machine
> 
> include/uapi/linux/perf_event.h        |  3 ++-
> tools/include/uapi/linux/perf_event.h  |  3 ++-
> tools/perf/Documentation/perf-list.txt |  1 +
> tools/perf/tests/parse-events.c        | 18 ++++++++++++++++++
> tools/perf/util/evsel.c                |  4 +++-
> tools/perf/util/parse-events.c         | 18 +++++++++++++-----
> tools/perf/util/parse-events.l         |  2 +-
> 7 files changed, 40 insertions(+), 9 deletions(-)
> 
> -- 
> 2.31.1
> 
> 
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> linux-riscv@...ts.infradead.org
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