linux-kernel - [PATCH v5 12/22] perf jevents: Add ILP metrics for Intel

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Message-ID: <20250829041104.4186320-13-irogers@google.com>
Date: Thu, 28 Aug 2025 21:10:53 -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 12/22] perf jevents: Add ILP metrics for Intel

Use the counter mask (cmask) to see how many cycles an instruction
takes to retire. Present as a set of ILP metrics.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/intel_metrics.py | 39 ++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 03983107c5c0..df0e1dce041c 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -262,6 +262,44 @@ def IntelBr():
                      description="breakdown of retired branch instructions")
 
 
+def IntelIlp() -> MetricGroup:
+  tsc = Event("msr/tsc/")
+  c0 = Event("msr/mperf/")
+  low = tsc - c0
+  inst_ret = Event("INST_RETIRED.ANY_P")
+  inst_ret_c = [Event(f"{inst_ret.name}/cmask={x}/") for x in range(1, 6)]
+  core_cycles = Event("CPU_CLK_UNHALTED.THREAD_P_ANY",
+                      "CPU_CLK_UNHALTED.DISTRIBUTED",
+                      "cycles")
+  ilp = [d_ratio(max(inst_ret_c[x] - inst_ret_c[x + 1], 0), core_cycles) for x in range(0, 4)]
+  ilp.append(d_ratio(inst_ret_c[4], core_cycles))
+  ilp0 = 1
+  for x in ilp:
+    ilp0 -= x
+  return MetricGroup("lpm_ilp", [
+      Metric("lpm_ilp_idle", "Lower power cycles as a percentage of all cycles",
+             d_ratio(low, tsc), "100%"),
+      Metric("lpm_ilp_inst_ret_0",
+             "Instructions retired in 0 cycles as a percentage of all cycles",
+             ilp0, "100%"),
+      Metric("lpm_ilp_inst_ret_1",
+             "Instructions retired in 1 cycles as a percentage of all cycles",
+             ilp[0], "100%"),
+      Metric("lpm_ilp_inst_ret_2",
+             "Instructions retired in 2 cycles as a percentage of all cycles",
+             ilp[1], "100%"),
+      Metric("lpm_ilp_inst_ret_3",
+             "Instructions retired in 3 cycles as a percentage of all cycles",
+             ilp[2], "100%"),
+      Metric("lpm_ilp_inst_ret_4",
+             "Instructions retired in 4 cycles as a percentage of all cycles",
+             ilp[3], "100%"),
+      Metric("lpm_ilp_inst_ret_5",
+             "Instructions retired in 5 or more cycles as a percentage of all cycles",
+             ilp[4], "100%"),
+  ])
+
+
 def IntelL2() -> Optional[MetricGroup]:
   try:
     DC_HIT = Event("L2_RQSTS.DEMAND_DATA_RD_HIT")
@@ -633,6 +671,7 @@ def main() -> None:
       Smi(),
       Tsx(),
       IntelBr(),
+      IntelIlp(),
       IntelL2(),
       IntelLdSt(),
       IntelPorts(),
-- 
2.51.0.318.gd7df087d1a-goog