linux-kernel - [PATCH v8 15/52] perf jevents: Add RAPL event metric for AMD zen models

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Message-ID: <20251113032040.1994090-16-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:03 -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 15/52] perf jevents: Add RAPL event metric for AMD zen models

Add power per second metrics based on RAPL.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/amd_metrics.py | 31 +++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index bc91d9c120fa..b6cdeb4f09fe 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -1,13 +1,36 @@
 #!/usr/bin/env python3
 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 import argparse
+import math
 import os
-from metric import (JsonEncodeMetric, JsonEncodeMetricGroupDescriptions, LoadEvents,
-                    MetricGroup)
+from metric import (d_ratio, has_event, Event, JsonEncodeMetric, JsonEncodeMetricGroupDescriptions,
+                    LoadEvents, Metric, MetricGroup, Select)
 
 # Global command line arguments.
 _args = None
 
+interval_sec = Event("duration_time")
+
+
+def Rapl() -> MetricGroup:
+    """Processor socket power consumption estimate.
+
+    Use events from the running average power limit (RAPL) driver.
+    """
+    # Watts = joules/second
+    # Currently only energy-pkg is supported by AMD:
+    # https://lore.kernel.org/lkml/20220105185659.643355-1-eranian@google.com/
+    pkg = Event("power/energy\\-pkg/")
+    cond_pkg = Select(pkg, has_event(pkg), math.nan)
+    scale = 2.3283064365386962890625e-10
+    metrics = [
+        Metric("lpm_cpu_power_pkg", "",
+               d_ratio(cond_pkg * scale, interval_sec), "Watts"),
+    ]
+
+    return MetricGroup("lpm_cpu_power", metrics,
+                       description="Processor socket power consumption estimates")
+
 
 def main() -> None:
     global _args
@@ -33,7 +56,9 @@ def main() -> None:
     directory = f"{_args.events_path}/x86/{_args.model}/"
     LoadEvents(directory)
 
-    all_metrics = MetricGroup("", [])
+    all_metrics = MetricGroup("", [
+        Rapl(),
+    ])
 
     if _args.metricgroups:
         print(JsonEncodeMetricGroupDescriptions(all_metrics))
-- 
2.51.2.1041.gc1ab5b90ca-goog