Re: [External] : [RFC PATCH v2 1/6] perf vendor events arm64: Add topdown L1 metrics for neoverse-n2

[Jing Zhang]

在 2022/11/15 下午7:19, John Garry 写道:
> On 15/11/2022 08:43, Jing Zhang wrote:
>> I didn't find out how to put the metric as an arch std event, it would be best if you could provide me with an example in the upstream code,
>> thank you very much.
> 
> As things stand, I don't think it's supported. We only support regular events for std arch events (and not metrics).
> 
> However we could expand support for metrics.
> 
> For the example of hip08 and FRONTEND_BOUND, we would have:
> 
> --->8---
> 
> diff --git a/tools/perf/pmu-events/arch/arm64/hisilicon/hip08/metrics.json b/tools/perf/pmu-events/arch/arm64/hisilicon/hip08/metrics.json
> index 6443a061e22a..5b1ca45224de 100644
> --- a/tools/perf/pmu-events/arch/arm64/hisilicon/hip08/metrics.json
> +++ b/tools/perf/pmu-events/arch/arm64/hisilicon/hip08/metrics.json
> @@ -1,10 +1,6 @@
>  [
>      {
> -        "MetricExpr": "FETCH_BUBBLE / (4 * CPU_CYCLES)",
> -        "PublicDescription": "Frontend bound L1 topdown metric",
> -        "BriefDescription": "Frontend bound L1 topdown metric",
> -        "MetricGroup": "TopDownL1",
> -        "MetricName": "frontend_bound"
> +        "ArchStdEvent": "FRONTEND_BOUND"
>      },
>      {
>          "MetricExpr": "(INST_SPEC - INST_RETIRED) / (4 * CPU_CYCLES)",
> diff --git a/tools/perf/pmu-events/arch/arm64/sbsa.json b/tools/perf/pmu-events/arch/arm64/sbsa.json
> new file mode 100644
> index 000000000000..10b9c0cccc40
> --- /dev/null
> +++ b/tools/perf/pmu-events/arch/arm64/sbsa.json
> @@ -0,0 +1,9 @@
> +[
> +    {
> +        "MetricExpr": "FETCH_BUBBLE / (4 * CPU_CYCLES)",
> +        "PublicDescription": "Frontend bound L1 topdown metric",
> +        "BriefDescription": "Frontend bound L1 topdown metric",
> +        "MetricGroup": "TopDownL1",
> +        "MetricName": "FRONTEND_BOUND"
> +    }
> +]
> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
> index 0daa3e007528..77049853c0bf 100755
> --- a/tools/perf/pmu-events/jevents.py
> +++ b/tools/perf/pmu-events/jevents.py
> @@ -352,6 +352,8 @@ def preprocess_arch_std_files(archpath: str) -> None:
>        for event in read_json_events(item.path, topic=''):
>          if event.name:
>            _arch_std_events[event.name.lower()] = event
> +        if event.metric_name:
> +          _arch_std_events[event.metric_name.lower()] = event
> 
> 
>  def print_events_table_prefix(tblname: str) -> None:


Sorry for slow response.

I tried the method you provided, but it didn't work, is there any other steps I am missing?
Or is this method not currently supported?


diff --git a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics
index 8ff1dfe..2ad30ec 100644
--- a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
+++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
@@ -1,10 +1,6 @@
 [
     {
-        "MetricExpr": "(stall_slot_frontend - cpu_cycles) / (5 * cpu_cycles)",
-        "PublicDescription": "Frontend bound L1 topdown metric",
-        "BriefDescription": "Frontend bound L1 topdown metric",
-        "MetricGroup": "TopDownL1",
-        "MetricName": "frontend_bound"
+        "ArchStdEvent": "FRONTEND_BOUND"
     },


diff --git a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeline.json b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeli
index f9fae15..e8536e2 100644
--- a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeline.json
+++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeline.json
@@ -6,9 +6,6 @@
     {
         "ArchStdEvent": "STALL_BACKEND_MEM"
-    }
+    },
+    {
+        "MetricExpr": "(stall_slot_frontend - cpu_cycles) / (5 * cpu_cycles)",
+        "PublicDescription": "Frontend bound L1 topdown metric",
+        "BriefDescription": "Frontend bound L1 topdown metric",
+        "MetricGroup": "TopDownL1",
+        "MetricName": "FRONTEND_BOUND"
+    }
 ]


diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 0daa3e0..7704985 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -352,6 +352,8 @@ def preprocess_arch_std_files(archpath: str) -> None:
       for event in read_json_events(item.path, topic=''):
         if event.name:
           _arch_std_events[event.name.lower()] = event
+        if event.metric_name:
+          _arch_std_events[event.metric_name.lower()] = event


#./perf stat -e FRONTEND_BOUND sleep 1
event syntax error: 'FRONTEND_BOUND'
                     \___ parser error
Run 'perf list' for a list of valid events

 Usage: perf stat [<options>] [<command>]

    -e, --event <event>   event selector. use 'perf list' to list available events



diff --git a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeline.json b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeli
index f9fae15..1089ca0 100644
--- a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeline.json
+++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/pipeline.json
@@ -6,18 +6,24 @@
         "ArchStdEvent": "STALL_BACKEND"
     },
     {
-        "ArchStdEvent": "STALL_SLOT_FRONTEND"
+        "ArchStdEvent": "STALL_SLOT_FRONTEND",
+        "MetricExpr": "STALL_SLOT_FRONTEND - CPU_CYCLES"
     },
     {

#./perf stat -e stall_slot_frontend sleep 1
Add CPU_CYCLES event to groups to get metric expression for stall_slot_frontend

 Performance counter stats for 'sleep 1':

         5,125,457      stall_slot_frontend  //it's still the original value.

       1.001017680 seconds time elapsed

       0.001162000 seconds user
       0.000000000 seconds sys


Thanks,
Jing