linux-kernel - [PATCH v8 25/52] perf jevents: Add ILP metrics for AMD

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Message-ID: <20251113032040.1994090-26-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:13 -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 25/52] perf jevents: Add ILP metrics for AMD

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/amd_metrics.py | 37 ++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 53f7c2198147..9a39e23075b8 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -121,6 +121,42 @@ def AmdBr():
                        description="breakdown of retired branch instructions")
 
 
+def AmdIlp() -> MetricGroup:
+    tsc = Event("msr/tsc/")
+    c0 = Event("msr/mperf/")
+    low = tsc - c0
+    inst_ret = Event("ex_ret_instr")
+    inst_ret_c = [Event(f"{inst_ret.name}/cmask={x}/") for x in range(1, 6)]
+    ilp = [d_ratio(max(inst_ret_c[x] - inst_ret_c[x + 1], 0), cycles)
+           for x in range(0, 4)]
+    ilp.append(d_ratio(inst_ret_c[4], 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 AmdDtlb() -> Optional[MetricGroup]:
     global _zen_model
     if _zen_model >= 4:
@@ -600,6 +636,7 @@ def main() -> None:
 
     all_metrics = MetricGroup("", [
         AmdBr(),
+        AmdIlp(),
         AmdDtlb(),
         AmdItlb(),
         AmdLdSt(),
-- 
2.51.2.1041.gc1ab5b90ca-goog