linux-kernel - [PATCH v8 36/52] perf jevents: Add ports metric group giving utilization on Intel

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Message-ID: <20251113032040.1994090-37-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:24 -0800
From: Ian Rogers <irogers@...gle.com>
To: Adrian Hunter <adrian.hunter@...el.com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Benjamin Gray <bgray@...ux.ibm.com>, 
	Caleb Biggers <caleb.biggers@...el.com>, Edward Baker <edward.baker@...el.com>, 
	Ian Rogers <irogers@...gle.com>, Ingo Molnar <mingo@...hat.com>, 
	James Clark <james.clark@...aro.org>, Jing Zhang <renyu.zj@...ux.alibaba.com>, 
	Jiri Olsa <jolsa@...nel.org>, John Garry <john.g.garry@...cle.com>, Leo Yan <leo.yan@....com>, 
	Namhyung Kim <namhyung@...nel.org>, Perry Taylor <perry.taylor@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Samantha Alt <samantha.alt@...el.com>, 
	Sandipan Das <sandipan.das@....com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Weilin Wang <weilin.wang@...el.com>, Xu Yang <xu.yang_2@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v8 36/52] 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 | 35 ++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 919a058c343a..7fcc0a1c544d 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -1,12 +1,14 @@
 #!/usr/bin/env python3
 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 import argparse
+import json
 import math
 import os
+import re
 from typing import Optional
 from metric import (d_ratio, has_event, max, CheckPmu, Event, JsonEncodeMetric,
-                    JsonEncodeMetricGroupDescriptions, LoadEvents, Metric,
-                    MetricGroup, MetricRef, Select)
+                    JsonEncodeMetricGroupDescriptions, Literal, LoadEvents,
+                    Metric, MetricGroup, MetricRef, Select)
 
 # Global command line arguments.
 _args = None
@@ -261,6 +263,34 @@ 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"))
+
+    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)
+
+    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(f"lpm_{port}", f"{port} utilization (higher is better)",
+                                  d_ratio(Event(name), cyc), "100%"))
+    if len(metrics) == 0:
+        return None
+
+    return MetricGroup("lpm_ports", metrics, "functional unit (port) utilization -- "
+                       "fraction of cycles each port is utilized (higher is better)")
+
+
 def IntelSwpf() -> Optional[MetricGroup]:
     ins = Event("instructions")
     try:
@@ -356,6 +386,7 @@ def main() -> None:
         Smi(),
         Tsx(),
         IntelBr(),
+        IntelPorts(),
         IntelSwpf(),
     ])
 
-- 
2.51.2.1041.gc1ab5b90ca-goog