linux-kernel - Re: [PATCH v2 0/6] perf arm64 metricgroup support

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Message-ID: <0c8379f9-c073-ebf8-5335-812f9b30c6cd@linux.ibm.com>
Date:   Wed, 7 Apr 2021 11:33:19 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     John Garry <john.garry@...wei.com>, will@...nel.org,
        mathieu.poirier@...aro.org, leo.yan@...aro.org,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, irogers@...gle.com
Cc:     linuxarm@...wei.com, kan.liang@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        zhangshaokun@...ilicon.com, pc@...ibm.com
Subject: Re: [PATCH v2 0/6] perf arm64 metricgroup support



On 3/25/21 4:03 PM, John Garry wrote:
> This series contains support to get basic metricgroups working for
> arm64 CPUs.
> 
> Initial support is added for HiSilicon hip08 platform.
> 
> Some sample usage on Huawei D06 board:
> 
>  $ ./perf list metric    
> 
> List of pre-defined events (to be used in -e): 
> 
> Metrics:     
> 
>   bp_misp_flush
>        [BP misp flush L3 topdown metric]
>   branch_mispredicts
>        [Branch mispredicts L2 topdown metric]
>   core_bound
>        [Core bound L2 topdown metric]
>   divider
>        [Divider L3 topdown metric]
>   exe_ports_util
>        [EXE ports util L3 topdown metric]
>   fetch_bandwidth_bound
>        [Fetch bandwidth bound L2 topdown metric]
>   fetch_latency_bound
>        [Fetch latency bound L2 topdown metric]
>   fsu_stall
>        [FSU stall L3 topdown metric]
>   idle_by_icache_miss
> 
> $ sudo ./perf stat -v -M core_bound sleep 1
> Using CPUID 0x00000000480fd010
> metric expr (exe_stall_cycle - (mem_stall_anyload + armv8_pmuv3_0@...nt\=0x7005@)) / cpu_cycles for core_bound
> found event cpu_cycles
> found event armv8_pmuv3_0/event=0x7005/
> found event exe_stall_cycle
> found event mem_stall_anyload
> adding {cpu_cycles -> armv8_pmuv3_0/event=0x7001/
> mem_stall_anyload -> armv8_pmuv3_0/event=0x7004/
> Control descriptor is not initialized
> cpu_cycles: 989433 385050 385050
> armv8_pmuv3_0/event=0x7005/: 19207 385050 385050
> exe_stall_cycle: 900825 385050 385050
> mem_stall_anyload: 253516 385050 385050
> 
> Performance counter stats for 'sleep':
> 
> 989,433      cpu_cycles      #     0.63 core_bound
>   19,207      armv8_pmuv3_0/event=0x7005/
>  900,825      exe_stall_cycle
>  253,516      mem_stall_anyload
> 
>        0.000805809 seconds time elapsed
> 
>        0.000875000 seconds user
>        0.000000000 seconds sys
>        
> perf stat --topdown is not supported, as this requires the CPU PMU to
> expose (alias) events for the TopDown L1 metrics from sysfs, which arm 
> does not do. To get that to work, we probably need to make perf use the
> pmu-events cpumap to learn about those alias events.
> 
> Metric reuse support is added for pmu-events parse metric testcase.
> This had been broken on power9 recentlty:
> https://lore.kernel.org/lkml/20210324015418.GC8931@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com/ 

Patch set looks good to me.

Reviewed-By: Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol jain

> 
> Differences to v1:
> - Add pmu_events_map__find() as arm64-specific function
> - Fix metric reuse for pmu-events parse metric testcase 
> 
> John Garry (6):
>   perf metricgroup: Make find_metric() public with name change
>   perf test: Handle metric reuse in pmu-events parsing test
>   perf pmu: Add pmu_events_map__find()
>   perf vendor events arm64: Add Hisi hip08 L1 metrics
>   perf vendor events arm64: Add Hisi hip08 L2 metrics
>   perf vendor events arm64: Add Hisi hip08 L3 metrics
> 
>  tools/perf/arch/arm64/util/Build              |   1 +
>  tools/perf/arch/arm64/util/pmu.c              |  25 ++
>  .../arch/arm64/hisilicon/hip08/metrics.json   | 233 ++++++++++++++++++
>  tools/perf/tests/pmu-events.c                 |  82 +++++-
>  tools/perf/util/metricgroup.c                 |  12 +-
>  tools/perf/util/metricgroup.h                 |   3 +-
>  tools/perf/util/pmu.c                         |   5 +
>  tools/perf/util/pmu.h                         |   1 +
>  tools/perf/util/s390-sample-raw.c             |   4 +-
>  9 files changed, 355 insertions(+), 11 deletions(-)
>  create mode 100644 tools/perf/arch/arm64/util/pmu.c
>  create mode 100644 tools/perf/pmu-events/arch/arm64/hisilicon/hip08/metrics.json
>