linux-kernel - [PATCH v5 09/13] perf jevents: Add uncore l3 metric group for AMD

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Message-ID: <20250829033138.4166591-10-irogers@google.com>
Date: Thu, 28 Aug 2025 20:31:34 -0700
From: Ian Rogers <irogers@...gle.com>
To: 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>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Xu Yang <xu.yang_2@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, John Garry <john.g.garry@...cle.com>, 
	Jing Zhang <renyu.zj@...ux.alibaba.com>, Sandipan Das <sandipan.das@....com>, 
	Benjamin Gray <bgray@...ux.ibm.com>
Subject: [PATCH v5 09/13] perf jevents: Add uncore l3 metric group for AMD

Metrics use the amd_l3 PMU for access/miss/hit information.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/amd_metrics.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 38ff7d1caafe..71500ea2204f 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -466,6 +466,22 @@ def Rapl() -> MetricGroup:
   return MetricGroup("lpm_cpu_power", metrics,
                      description="Processor socket power consumption estimates")
 
+def UncoreL3():
+  acc = Event("l3_lookup_state.all_coherent_accesses_to_l3",
+              "l3_lookup_state.all_l3_req_typs")
+  miss = Event("l3_lookup_state.l3_miss",
+               "l3_comb_clstr_state.request_miss")
+  acc = max(acc, miss)
+  hits = acc - miss
+
+  return MetricGroup("lpm_l3", [
+      Metric("lpm_l3_accesses", "L3 victim cache accesses",
+             d_ratio(acc, interval_sec), "accesses/sec"),
+      Metric("lpm_l3_hits", "L3 victim cache hit rate", d_ratio(hits, acc), "100%"),
+      Metric("lpm_l3_miss", "L3 victim cache miss rate", d_ratio(miss, acc),
+             "100%"),
+  ], description="L3 cache breakdown per CCX")
+
 
 def main() -> None:
   global _args
@@ -501,6 +517,7 @@ def main() -> None:
       AmdUpc(),
       Idle(),
       Rapl(),
+      UncoreL3(),
   ])
 
   if _args.metricgroups:
-- 
2.51.0.318.gd7df087d1a-goog