linux-kernel - Re: [PATCH 2/6] tools/perf/json: Add cache metrics for s390 z16

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Date:   Mon, 13 Mar 2023 08:22:44 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, sumanthk@...ux.ibm.com, svens@...ux.ibm.com,
        gor@...ux.ibm.com, hca@...ux.ibm.com
Subject: Re: [PATCH 2/6] tools/perf/json: Add cache metrics for s390 z16

On Mon, Mar 13, 2023 at 1:30 AM Thomas Richter <tmricht@...ux.ibm.com> wrote:
>
> Add metrics for s390 z16
> - Percentage sourced from Level 2 cache
> - Percentage sourced from Level 3 on same chip cache
> - Percentage sourced from Level 4 Local cache on same book
> - Percentage sourced from Level 4 Remote cache on different book
> - Percentage sourced from memory
>
> For details about the formulas see this documentation:
> https://www.ibm.com/support/pages/system/files/inline-files/CPU%20MF%20Formulas%20including%20z16%20-%20May%202022_1.pdf
>
> Outpuf after:
>  # ./perf stat -M l4rp -- dd if=/dev/zero of=/dev/null bs=10M count=10K
>  .... dd output deleted
>
>  Performance counter stats for 'dd if=/dev/zero of=/dev/null bs=10M count=10K':
>
>                  0      IDCW_OFF_DRAWER_CHIP_HIT         #     0.00 l4rp
>            431,866      L1I_DIR_WRITES
>              2,395      IDCW_OFF_DRAWER_IV
>                  0      ICW_OFF_DRAWER
>                  0      IDCW_OFF_DRAWER_DRAWER_HIT
>              1,437      DCW_OFF_DRAWER
>        425,960,793      L1D_DIR_WRITES
>
>       12.165030699 seconds time elapsed
>
>        0.001037000 seconds user
>       12.162140000 seconds sys
>
>  #
>
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> Acked-By: Sumanth Korikkar <sumanthk@...ux.ibm.com>

Acked-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  .../arch/s390/cf_z16/transaction.json         | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json b/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json
> index 86bf83b4504e..dde0735a7d22 100644
> --- a/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json
> +++ b/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json
> @@ -18,5 +18,30 @@
>      "BriefDescription": "Level One Miss per 100 Instructions",
>      "MetricName": "l1mp",
>      "MetricExpr": "((L1I_DIR_WRITES + L1D_DIR_WRITES) / INSTRUCTIONS) * 100"
> +  },
> +  {
> +    "BriefDescription": "Percentage sourced from Level 2 cache",
> +    "MetricName": "l2p",
> +    "MetricExpr": "((DCW_REQ + DCW_REQ_IV + ICW_REQ + ICW_REQ_IV) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
> +  },
> +  {
> +    "BriefDescription": "Percentage sourced from Level 3 on same chip cache",
> +    "MetricName": "l3p",
> +    "MetricExpr": "((DCW_REQ_CHIP_HIT + DCW_ON_CHIP + DCW_ON_CHIP_IV + DCW_ON_CHIP_CHIP_HIT + ICW_REQ_CHIP_HIT + ICW_ON_CHIP + ICW_ON_CHIP_IV + ICW_ON_CHIP_CHIP_HIT) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
> +  },
> +  {
> +    "BriefDescription": "Percentage sourced from Level 4 Local cache on same book",
> +    "MetricName": "l4lp",
> +    "MetricExpr": "((DCW_REQ_DRAWER_HIT + DCW_ON_CHIP_DRAWER_HIT + DCW_ON_MODULE + DCW_ON_DRAWER + IDCW_ON_MODULE_IV + IDCW_ON_MODULE_CHIP_HIT + IDCW_ON_MODULE_DRAWER_HIT + IDCW_ON_DRAWER_IV + IDCW_ON_DRAWER_CHIP_HIT + IDCW_ON_DRAWER_DRAWER_HIT + ICW_REQ_DRAWER_HIT + ICW_ON_CHIP_DRAWER_HIT + ICW_ON_MODULE + ICW_ON_DRAWER) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
> +  },
> +  {
> +    "BriefDescription": "Percentage sourced from Level 4 Remote cache on different book",
> +    "MetricName": "l4rp",
> +    "MetricExpr": "((DCW_OFF_DRAWER + IDCW_OFF_DRAWER_IV + IDCW_OFF_DRAWER_CHIP_HIT + IDCW_OFF_DRAWER_DRAWER_HIT + ICW_OFF_DRAWER) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
> +  },
> +  {
> +    "BriefDescription": "Percentage sourced from memory",
> +    "MetricName": "memp",
> +    "MetricExpr": "((DCW_ON_CHIP_MEMORY + DCW_ON_MODULE_MEMORY + DCW_ON_DRAWER_MEMORY + DCW_OFF_DRAWER_MEMORY + ICW_ON_CHIP_MEMORY + ICW_ON_MODULE_MEMORY + ICW_ON_DRAWER_MEMORY + ICW_OFF_DRAWER_MEMORY) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
>    }
>  ]
> --
> 2.39.1
>