linux-kernel - [PATCH v8 49/52] perf jevents: Add mesh bandwidth saturation metric for Intel

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Message-ID: <20251113032040.1994090-50-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:37 -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 49/52] 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 f6bb691dc5bb..d56bab7337df 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -1033,6 +1033,22 @@ 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")
@@ -1097,6 +1113,7 @@ def main() -> None:
         UncoreDir(),
         UncoreMem(),
         UncoreMemBw(),
+        UncoreMemSat(),
         UncoreUpiBw(),
     ])
 
-- 
2.51.2.1041.gc1ab5b90ca-goog