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    SubjectRe: [PATCH RFC 0/4] Add JSON metrics for arm CMN and Yitian710 DDR
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    在 2023/3/28 上午12:51, Ian Rogers 写道:
    > On Sun, Mar 26, 2023 at 7:46 PM Jing Zhang <renyu.zj@linux.alibaba.com> wrote:
    >>
    >> Hi all,
    >>
    >> I add an identifier sysfs file for the yitian710 SoC DDR and arm CMN 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 several general CMN700 metrics
    >> and yitian710 soc DDR metrics.
    >
    > Thanks!
    >
    >> Since the eventid of cmn700 events is different from other events, it
    >> can't be specified by "EventCode" or "ConfigCode", so in the cmn.json
    >> file of cmn700, no "EventCode" and "ConfigCode" are added for these
    >> events. For example, the eventid of "arm_cmn_0/hnf_sf_hit is/":
    >> cat /sys/bus/event_source/devices/arm_cmn_0/events/hnf_sf_hit
    >> type=0x5,eventid=0x6
    >
    > This is done to add descriptions to the events? We can add encodings
    > to jevents.py and the event parsing to handle the names eventid and
    > type.
    >

    Ok, I will try it.

    >> In addition, both cmn700 and ddr PMU can count the information in a die,
    >> but the same SoC can also be configured with different numbers of dies,
    >> so it is dificult to design a general expression to obtain metrics in
    >> different dies. The current yitian710 ddr bandwidth metric describes the
    >> sum of all dies bandwidth. I would like to ask you, is there any general
    >> expression can obtain metrics for die? Add an option to specify die?
    >
    > So hopefully the logic for this is getting clearer in the
    > perf-tools-next branch. When perf stat runs it will aggregate in a
    > number of different ways, if you pass -A it will remove the
    > aggregation, but you can also use --per-socket, per-die, .. The
    > metrics take the individual counter values, say instructions and
    > cycles and produce a metric like IPC. By default all the instruction
    > counts are aggregated together, the cycles are aggregated together and
    > then the metric produced on the two aggregated values. When -A or
    > --per-die are passed, the appropriate amount of aggregation should be
    > done then the metric computed multiple times.
    >

    Thanks! It is helpful. It solved my problem.

    Thanks,
    Jing

    > Are you asking for a way in a metric to take counts from one die and
    > use them in the other's metric? For example, reads on one die are
    > writes on the other? This is possible as we have all the counts in the
    > tool. I've thought about this in the context of some metrics we have
    > for AMD, but there is no support for this in the tool currently.
    >
    > Thanks,
    > Ian
    >
    >> Thanks,
    >> Jing
    >>
    >> Jing Zhang (4):
    >> driver/perf: Add identifier sysfs file for CMN
    >> perf vendor events: Add JSON metrics for cmn700
    >> driver/perf: Add identifier sysfs file for Yitian 710 DDR
    >> perf vendor events: Add JSON metrics for Yitian 710 DDR
    >>
    >> drivers/perf/alibaba_uncore_drw_pmu.c | 27 ++
    >> drivers/perf/arm-cmn.c | 43 +++
    >> .../pmu-events/arch/arm64/arm/cmn700/sys/cmn.json | 188 +++++++++++
    >> .../arch/arm64/arm/cmn700/sys/metrics.json | 74 ++++
    >> .../arm64/freescale/yitian710/sys/ali_drw.json | 373 +++++++++++++++++++++
    >> .../arm64/freescale/yitian710/sys/metrics.json | 20 ++
    >> tools/perf/pmu-events/jevents.py | 2 +
    >> 7 files changed, 727 insertions(+)
    >> create mode 100644 tools/perf/pmu-events/arch/arm64/arm/cmn700/sys/cmn.json
    >> create mode 100644 tools/perf/pmu-events/arch/arm64/arm/cmn700/sys/metrics.json
    >> 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
    >>

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