[PATCH v2 08/20] perf jevents: Add ports metric group giving utilization on Intel

[Ian Rogers]

The ports metric group contains a metric for each port giving its
utilization as a ratio of cycles. The metrics are created by looking
for UOPS_DISPATCHED.PORT events.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/pmu-events/intel_metrics.py | 33 ++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 6c42c8947652..49b83bc28891 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -1,12 +1,13 @@
 #!/usr/bin/env python3
 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 from metric import (d_ratio, has_event, max, CheckPmu, Event, JsonEncodeMetric,
-                    JsonEncodeMetricGroupDescriptions, LoadEvents, Metric,
-                    MetricGroup, MetricRef, Select)
+                    JsonEncodeMetricGroupDescriptions, Literal, LoadEvents,
+                    Metric, MetricGroup, MetricRef, Select)
 import argparse
 import json
 import math
 import os
+import re
 from typing import Optional
 
 parser = argparse.ArgumentParser(description="Intel perf json generator")
@@ -18,6 +19,11 @@ directory = f"{os.path.dirname(os.path.realpath(__file__))}/arch/x86/{args.model
 LoadEvents(directory)
 
 interval_sec = Event("duration_time")
+core_cycles = Event("CPU_CLK_UNHALTED.THREAD_P_ANY",
+                    "CPU_CLK_UNHALTED.DISTRIBUTED",
+                    "cycles")
+# Number of CPU cycles scaled for SMT.
+smt_cycles = Select(core_cycles / 2, Literal("#smt_on"), core_cycles)
 
 def Idle() -> Metric:
   cyc = Event("msr/mperf/")
@@ -266,6 +272,28 @@ def IntelBr():
                      description="breakdown of retired branch instructions")
 
 
+def IntelPorts() -> Optional[MetricGroup]:
+  pipeline_events = json.load(open(f"{os.path.dirname(os.path.realpath(__file__))}"
+                                   f"/arch/x86/{args.model}/pipeline.json"))
+
+  metrics = []
+  for x in pipeline_events:
+    if "EventName" in x and re.search("^UOPS_DISPATCHED.PORT", x["EventName"]):
+      name = x["EventName"]
+      port = re.search(r"(PORT_[0-9].*)", name).group(0).lower()
+      if name.endswith("_CORE"):
+        cyc = core_cycles
+      else:
+        cyc = smt_cycles
+      metrics.append(Metric(port, f"{port} utilization (higher is better)",
+                            d_ratio(Event(name), cyc), "100%"))
+  if len(metrics) == 0:
+    return None
+
+  return MetricGroup("ports", metrics, "functional unit (port) utilization -- "
+                     "fraction of cycles each port is utilized (higher is better)")
+
+
 def IntelSwpf() -> Optional[MetricGroup]:
   ins = Event("instructions")
   try:
@@ -336,6 +364,7 @@ all_metrics = MetricGroup("", [
     Smi(),
     Tsx(),
     IntelBr(),
+    IntelPorts(),
     IntelSwpf(),
 ])
 
-- 
2.44.0.278.ge034bb2e1d-goog