linux-kernel - [PATCH v4 15/22] perf jevents: Add Miss Level Parallelism (MLP) metric for Intel

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Message-Id: <20240926175035.408668-16-irogers@google.com>
Date: Thu, 26 Sep 2024 10:50:28 -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>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 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>
Subject: [PATCH v4 15/22] perf jevents: Add Miss Level Parallelism (MLP)
 metric for Intel

Number of outstanding load misses per cycle.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/intel_metrics.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index dc14fff7abc3..8c6be9e1883f 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -593,6 +593,20 @@ def IntelL2() -> Optional[MetricGroup]:
   ], description = "L2 data cache analysis")
 
 
+def IntelMlp() -> Optional[Metric]:
+  try:
+    l1d = Event("L1D_PEND_MISS.PENDING")
+    l1dc = Event("L1D_PEND_MISS.PENDING_CYCLES")
+  except:
+    return None
+
+  l1dc = Select(l1dc / 2, Literal("#smt_on"), l1dc)
+  ml = d_ratio(l1d, l1dc)
+  return Metric("mlp",
+                "Miss level parallelism - number of outstanding load misses per cycle (higher is better)",
+                ml, "load_miss_pending/cycle")
+
+
 def IntelPorts() -> Optional[MetricGroup]:
   pipeline_events = json.load(open(f"{_args.events_path}/x86/{_args.model}/pipeline.json"))
 
@@ -800,6 +814,7 @@ def main() -> None:
       IntelIlp(),
       IntelL2(),
       IntelLdSt(),
+      IntelMlp(),
       IntelPorts(),
       IntelSwpf(),
   ])
-- 
2.46.1.824.gd892dcdcdd-goog