[PATCH v1 02/20] perf jevents: Add idle metric for Intel models

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

Compute using the msr PMU the percentage of wallclock cycles where the
CPUs are in a low power state.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/pmu-events/intel_metrics.py | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 5827f555005f..46866a25b166 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -1,7 +1,8 @@
#!/usr/bin/env python3
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
-from metric import (d_ratio, has_event, Event, JsonEncodeMetric, JsonEncodeMetricGroupDescriptions,
- LoadEvents, Metric, MetricGroup, Select)
+from metric import (d_ratio, has_event, max, Event, JsonEncodeMetric,
+ JsonEncodeMetricGroupDescriptions, LoadEvents, Metric,
+ MetricGroup, Select)
import argparse
import json
import math
@@ -17,6 +18,16 @@ LoadEvents(directory)

interval_sec = Event("duration_time")

+def Idle() -> Metric:
+ cyc = Event("msr/mperf/")
+ tsc = Event("msr/tsc/")
+ low = max(tsc - cyc, 0)
+ return Metric(
+ "idle",
+ "Percentage of total wallclock cycles where CPUs are in low power state (C1 or deeper sleep state)",
+ d_ratio(low, tsc), "100%")
+
+
def Rapl() -> MetricGroup:
"""Processor socket power consumption estimate.

@@ -52,6 +63,7 @@ def Rapl() -> MetricGroup:

all_metrics = MetricGroup("", [
+ Idle(),
Rapl(),
])

--
2.44.0.278.ge034bb2e1d-goog