linux-kernel - [PATCH v1 14/20] perf jevents: Add Miss Level Parallelism (MLP) metric for Intel

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Message-Id: <20240229001806.4158429-15-irogers@google.com>
Date: Wed, 28 Feb 2024 16:17:59 -0800
From: Ian Rogers <irogers@...gle.com>
To: 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>, Andi Kleen <ak@...ux.intel.com>, 
	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>, 
	John Garry <john.g.garry@...cle.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jing Zhang <renyu.zj@...ux.alibaba.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	James Clark <james.clark@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v1 14/20] perf jevents: Add Miss Level Parallelism (MLP)
 metric for Intel

Number of oustanding 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 fef40969a4b8..e373f87d499d 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -617,6 +617,20 @@ 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 oustanding load misses per cycle (higher is better)",
+                ml, "load_miss_pending/cycle")
+
+
 def IntelPorts() -> Optional[MetricGroup]:
   pipeline_events = json.load(open(f"{os.path.dirname(os.path.realpath(__file__))}"
                                    f"/arch/x86/{args.model}/pipeline.json"))
@@ -798,6 +812,7 @@ all_metrics = MetricGroup("", [
     IntelIlp(),
     IntelL2(),
     IntelLdSt(),
+    IntelMlp(),
     IntelPorts(),
     IntelSwpf(),
 ])
-- 
2.44.0.278.ge034bb2e1d-goog