linux-kernel - Re: [PATCH] perf vendor events riscv: add StarFive Dubhe-80 JSON file

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Message-ID: <20231103051530.912669-1-jisheng.teoh@starfivetech.com>
Date:   Fri, 3 Nov 2023 13:15:30 +0800
From:   Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
To:     <irogers@...gle.com>
CC:     <acme@...nel.org>, <adrian.hunter@...el.com>,
        <alexander.shishkin@...ux.intel.com>, <aou@...s.berkeley.edu>,
        <beeman@...osinc.com>, <jisheng.teoh@...rfivetech.com>,
        <jolsa@...nel.org>, <kconsul@...tanamicro.com>,
        <leyfoon.tan@...rfivetech.com>, <linux-kernel@...r.kernel.org>,
        <linux-perf-users@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <mark.rutland@....com>,
        <mingo@...hat.com>, <n.shubin@...ro.com>, <namhyung@...nel.org>,
        <palmer@...belt.com>, <paul.walmsley@...ive.com>,
        <peterz@...radead.org>
Subject: Re: [PATCH] perf vendor events riscv: add StarFive Dubhe-80 JSON file

>>
>> StarFive's Dubhe-80 supports raw event id 0x00 - 0x22.
>> The raw events are enabled through PMU node of DT binding.
>>
>> Example of PMU DT node:
>> pmu {
>>         compatible = "riscv,pmu";
>>         riscv,raw-event-to-mhpmcounters =
>>                 /* Event ID 1-31 */
>>                 <0x00 0x00 0xFFFFFFFF 0xFFFFFFE0 0x00007FF8>,
>>                 /* Event ID 32-33 */
>>                 <0x00 0x20 0xFFFFFFFF 0xFFFFFFFE 0x00007FF8>,
>>                 /* Event ID 34 */
>>                 <0x00 0x22 0xFFFFFFFF 0xFFFFFF22 0x00007FF8>;
>> };
>>
>> Example of Perf stat output:
>> [root@...r]# perf stat -a \
>>         -e access_mmu_stlb \
>>         -e miss_mmu_stlb \
>>         -e access_mmu_pte_c \
>>         -e rob_flush \
>>         -e btb_prediction_miss \
>>         -e itlb_miss \
>>         -e sync_del_fetch_g \
>>         -e icache_miss \
>>         -e bpu_br_retire \
>>         -e bpu_br_miss \
>>         -e ret_ins_retire \
>>         -e ret_ins_miss \
>>         -- openssl speed rsa2048
>>
>> Doing 2048 bits private rsa's for 10s: 39 2048 bits private RSA's in
>> 10.14s
>> Doing 2048 bits public rsa's for 10s: 1563 2048 bits public RSA's in
>> 10.00s
>> version: 3.0.11
>> built on: Tue Sep 19 13:02:31 2023 UTC
>> options: bn(64,64)
>> CPUINFO: N/A
>>                   sign    verify    sign/s verify/s
>> rsa 2048 bits 0.260000s 0.006398s      3.8    156.3
>>
>>  Performance counter stats for 'system wide':
>>
>>            1338350      access_mmu_stlb
>>            1154025      miss_mmu_stlb
>>            1162691      access_mmu_pte_c
>>              34067      rob_flush
>>           11212384      btb_prediction_miss
>>            1256242      itlb_miss
>>          652523491      sync_del_fetch_g
>>             384465      icache_miss
>>           64635789      bpu_br_retire
>>             323440      bpu_br_miss
>>            8785143      ret_ins_retire
>>              31236      ret_ins_miss
>>
>>       20.760822480 seconds time elapsed
>>
>> Signed-off-by: Ji Sheng Teoh <jisheng.teoh@...xxxxxxxxxxxxx>
>
> Thanks Ji Sheng,
>
> in adding these events for this new architecture is there a reason not
> to add the architecture standard events in
> tools/perf/pmu-events/arch/riscv/riscv-sbi-firmware.json ?
> https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/pmu-events/arch/riscv/riscv-sbi-firmware.json?h=perf-tools-next
>
> Perhaps it is worth commenting in the commit message whether or not
> these events are supported.
>
> Thanks,
> Ian

Thanks Ian for the comment,

The architecture standard events are supported as well.
I will include them in v2.

Thanks,
Ji Sheng