Re: [PATCH v3 0/6] perf arm64 metricgroup support

[Jiri Olsa]

On Wed, Apr 07, 2021 at 06:32:44PM +0800, 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@event\=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 recently:
> https://lore.kernel.org/lkml/20210324015418.GC8931@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ 
> 
> Differences to v2:
> - Add TB and RB tags (Thanks!)
> - Rename metricgroup__find_metric() from metricgroup_find_metric()
> - Change resolve_metric_simple() to rescan after any insert

Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>

thanks,
jirka