[PATCH v1 07/20] perf jevents: Add ports metric group giving utilization on Intel

Ian Rogers
2024-02-29T00:18:40Z

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@google.com>
---
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 f11273e9935c..63d46ee1dca9 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, 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:
@@ -265,6 +271,28 @@ 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:
@@ -335,6 +363,7 @@ all_metrics = MetricGroup("", [
Smi(),
Tsx(),
IntelBr(),
+ IntelPorts(),
IntelSwpf(),
])

--
2.44.0.278.ge034bb2e1d-goog