[v8,8/9] perf vendor events arm64: Add PE utilization metrics for neoverse-n2-v2

Commit Message

Jing Zhang Jan. 17, 2023, 7:29 a.m. UTC

Add PE utilization related metrics. In cpu_utilization metric, if it is
neoverse-n2 which slots are 5, the real stall_slot need to subtract the
cpu_cycles according to the neoverse-n2 errata [0].

[0] https://documentation-service.arm.com/static/636a66a64e6cf12278ad89cb?token=

Signed-off-by: Jing Zhang <[e-mail]>
Reviewed-by: John Garry <[e-mail]>
Acked-by: Ian Rogers <[e-mail]>
---
 .../arch/arm64/arm/neoverse-n2-v2/metrics.json     | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)

Patch

diff --git a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2-v2/metrics.json b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2-v2/metrics.json
index afcdb17..3d6ac0c 100644
--- a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2-v2/metrics.json
+++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2-v2/metrics.json
@@ -160,5 +160,51 @@ 
         "MetricGroup": "Branch",
         "MetricName": "branch_miss_pred_rate",
         "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "instructions / CPU_CYCLES",
+        "BriefDescription": "The average number of instructions executed for each cycle.",
+        "MetricGroup": "PEutilization",
+        "MetricName": "ipc"
+    },
+    {
+        "MetricExpr": "ipc / 5",
+        "BriefDescription": "IPC percentage of peak. The peak of IPC is 5.",
+        "MetricGroup": "PEutilization",
+        "MetricName": "ipc_rate",
+        "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "INST_RETIRED / CPU_CYCLES",
+        "BriefDescription": "Architecturally executed Instructions Per Cycle (IPC)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "retired_ipc"
+    },
+    {
+        "MetricExpr": "INST_SPEC / CPU_CYCLES",
+        "BriefDescription": "Speculatively executed Instructions Per Cycle (IPC)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "spec_ipc"
+    },
+    {
+        "MetricExpr": "OP_RETIRED / OP_SPEC",
+        "BriefDescription": "Of all the micro-operations issued, what percentage are retired(committed)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "retired_rate",
+        "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "1 - OP_RETIRED / OP_SPEC",
+        "BriefDescription": "Of all the micro-operations issued, what percentage are not retired(committed)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "wasted_rate",
+        "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "OP_RETIRED / OP_SPEC * (1 - (STALL_SLOT if (#slots - 5) else (STALL_SLOT - CPU_CYCLES)) / (#slots * CPU_CYCLES))",
+        "BriefDescription": "The truly effective ratio of micro-operations executed by the CPU, which means that misprediction and stall are not included",
+        "MetricGroup": "PEutilization",
+        "MetricName": "cpu_utilization",
+        "ScaleUnit": "100%"
     }
 ]