linux-kernel - [PATCH v5 22/22] perf jevents: Add mesh bandwidth saturation metric for Intel

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Message-ID: <20250829041104.4186320-23-irogers@google.com>
Date: Thu, 28 Aug 2025 21:11:03 -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>, Perry Taylor <perry.taylor@...el.com>, 
	Samantha Alt <samantha.alt@...el.com>, Caleb Biggers <caleb.biggers@...el.com>, 
	Weilin Wang <weilin.wang@...el.com>, Edward Baker <edward.baker@...el.com>, 
	Thomas Falcon <thomas.falcon@...el.com>
Subject: [PATCH v5 22/22] perf jevents: Add mesh bandwidth saturation metric
 for Intel

Memory bandwidth saturation from CBOX/CHA events present in
broadwellde, broadwellx, cascadelakex, haswellx, icelakex, skylakex
and snowridgex.

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

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 19c7357c496a..7250e8c8eeba 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -1009,6 +1009,22 @@ def UncoreMemBw() -> Optional[MetricGroup]:
   ], description = "Memory Bandwidth")
 
 
+def UncoreMemSat() -> Optional[Metric]:
+  try:
+    clocks = Event("UNC_CHA_CLOCKTICKS", "UNC_C_CLOCKTICKS")
+    sat = Event("UNC_CHA_DISTRESS_ASSERTED.VERT", "UNC_CHA_FAST_ASSERTED.VERT",
+                "UNC_C_FAST_ASSERTED")
+  except:
+    return None
+
+  desc = ("Mesh Bandwidth saturation (% CBOX cycles with FAST signal asserted, "
+          "include QPI bandwidth saturation), lower is better")
+  if "UNC_CHA_" in sat.name:
+    desc = ("Mesh Bandwidth saturation (% CHA cycles with FAST signal asserted, "
+            "include UPI bandwidth saturation), lower is better")
+  return Metric("lpm_mem_sat", desc, d_ratio(sat, clocks), "100%")
+
+
 def UncoreUpiBw() -> Optional[MetricGroup]:
   try:
     upi_rds = Event("UNC_UPI_RxL_FLITS.ALL_DATA")
@@ -1071,6 +1087,7 @@ def main() -> None:
       UncoreDir(),
       UncoreMem(),
       UncoreMemBw(),
+      UncoreMemSat(),
       UncoreUpiBw(),
   ])
 
-- 
2.51.0.318.gd7df087d1a-goog