linux-kernel - Re: [PATCH v4 0/4] Add JSON metrics for Yitian710 DDR

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Date:   Tue, 20 Jun 2023 12:04:31 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jing Zhang <renyu.zj@...ux.alibaba.com>
Cc:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Jonathan Corbet <corbet@....net>,
        John Garry <john.g.garry@...cle.com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Ian Rogers <irogers@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-doc@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: Re: [PATCH v4 0/4] Add JSON metrics for Yitian710 DDR

Hello,

On Tue, Jun 20, 2023 at 12:17 AM Jing Zhang <renyu.zj@...ux.alibaba.com> wrote:
>
> Hi all,
>
> I add an identifier sysfs file for the yitian710 SoC DDR to allow
> userspace to identify the specific implementation of the device,
> so that the perf tool can match the corresponding uncore events and
> metrics through the identifier. Then added yitian710 SoC DDR
> metrics and events alias.
>
> Change since v3:
> - Split the CMN and ali_drw patches. This patchset only contains
>   ali_drw PMU related patches. The CMN metric related patches will
>   be in another patchset.
> - Link: https://lore.kernel.org/all/1685438374-33287-1-git-send-email-renyu.zj@linux.alibaba.com/
>
> $perf list:
> ...
> ali_drw:
>   chi_rxdat
>        [A packet at CHI RXDAT interface (write data). Unit: ali_drw]
>   chi_rxrsp
>        [A packet at CHI RXRSP interface. Unit: ali_drw]
>   chi_txdat
>        [A packet at CHI TXDAT interface (read data). Unit: ali_drw]
>   chi_txreq
>        [A packet at CHI TXREQ interface (request). Unit: ali_drw]
>   cycle
>        [The ddr cycle. Unit: ali_drw]
> ...
> ali_drw:
>   ddr_read_bandwidth.all
>        [The ddr read bandwidth(MB/s). Unit: ali_drw ]
>   ddr_write_bandwidth.all
>        [The ddr write bandwidth(MB/s). Unit: ali_drw ]
> ...
>
> $perf stat -M ddr_read_bandwidth.all ./test
>
> Performance counter stats for 'system wide':
>
>             38,150      hif_rd        #  2.4 MB/s  ddr_read_bandwidth.all
>      1,000,957,941 ns   duration_time
>
>        1.000957941 seconds time elapsed
>
> Jing Zhang (4):
>   driver/perf: Add identifier sysfs file for Yitian 710 DDR
>   perf jevents: Add support for Yitian 710 DDR PMU aliasing
>   perf vendor events: Add JSON metrics for Yitian 710 DDR
>   docs: perf: Update metric usage for Alibaba's T-Head PMU driver

So patch 1 is for the kernel, and patch 2-4 depend on it, right?

I'm curious why the first patch is needed, presumably the PMU
should have 'ali_drw' in the name already.  Do we use substring
match for the compat name in the JSON metric?

Thanks,
Namhyung

>
>  Documentation/admin-guide/perf/alibaba_pmu.rst     |   5 +
>  drivers/perf/alibaba_uncore_drw_pmu.c              |  27 ++
>  .../arm64/freescale/yitian710/sys/ali_drw.json     | 373 +++++++++++++++++++++
>  .../arm64/freescale/yitian710/sys/metrics.json     |  20 ++
>  tools/perf/pmu-events/jevents.py                   |   1 +
>  5 files changed, 426 insertions(+)
>  create mode 100644 tools/perf/pmu-events/arch/arm64/freescale/yitian710/sys/ali_drw.json
>  create mode 100644 tools/perf/pmu-events/arch/arm64/freescale/yitian710/sys/metrics.json
>
> --
> 1.8.3.1
>