linux-kernel - [PATCH v3 08/20] perf jevents: Add ports metric group giving utilization on Intel

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Date: Wed, 13 Mar 2024 22:59:07 -0700
From: Ian Rogers <irogers@...gle.com>
To: Perry Taylor <perry.taylor@...el.com>, Samantha Alt <samantha.alt@...el.com>, 
	Caleb Biggers <caleb.biggers@...el.com>, Weilin Wang <weilin.wang@...el.com>, 
	Edward Baker <edward.baker@...el.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@....com>, John Garry <john.g.garry@...cle.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v3 08/20] perf jevents: Add ports metric group giving
 utilization on Intel

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@...gle.com>
---
 tools/perf/pmu-events/intel_metrics.py | 32 ++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index b02d0c0c3793..b181574c9486 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -1,17 +1,23 @@
 #!/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
 
 # Global command line arguments.
 _args = None
 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/")
@@ -260,6 +266,27 @@ def IntelBr():
                      description="breakdown of retired branch instructions")
 
 
+def IntelPorts() -> Optional[MetricGroup]:
+  pipeline_events = json.load(open(f"{_args.events_path}/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:
@@ -352,6 +379,7 @@ def main() -> None:
       Smi(),
       Tsx(),
       IntelBr(),
+      IntelPorts(),
       IntelSwpf(),
   ])
 
-- 
2.44.0.278.ge034bb2e1d-goog