linux-kernel - [PATCH v8 21/52] perf jevents: Add itlb metric group for AMD

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Message-ID: <20251113032040.1994090-22-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:09 -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 21/52] perf jevents: Add itlb metric group for AMD

Add metrics that give an overview and details of the l1 itlb (zen1,
zen2, zen3) and l2 itlb (all zens).

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/amd_metrics.py | 49 ++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index be27a4947e45..60f4ecedae6c 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -121,6 +121,54 @@ def AmdBr():
                        description="breakdown of retired branch instructions")
 
 
+def AmdItlb():
+    global _zen_model
+    l2h = Event("bp_l1_tlb_miss_l2_tlb_hit", "bp_l1_tlb_miss_l2_hit")
+    l2m = Event("l2_itlb_misses")
+    l2r = l2h + l2m
+
+    itlb_l1_mg = None
+    l1m = l2r
+    if _zen_model <= 3:
+        l1r = Event("ic_fw32")
+        l1h = max(l1r - l1m, 0)
+        itlb_l1_mg = MetricGroup("lpm_itlb_l1", [
+            Metric("lpm_itlb_l1_hits",
+                   "L1 ITLB hits as a perecentage of L1 ITLB accesses.",
+                   d_ratio(l1h, l1h + l1m), "100%"),
+            Metric("lpm_itlb_l1_miss",
+                   "L1 ITLB misses as a perecentage of L1 ITLB accesses.",
+                   d_ratio(l1m, l1h + l1m), "100%"),
+            Metric("lpm_itlb_l1_reqs",
+                   "The number of 32B fetch windows transferred from IC pipe to DE "
+                   "instruction decoder per second.", d_ratio(
+                       l1r, interval_sec),
+                   "windows/sec"),
+        ])
+
+    return MetricGroup("lpm_itlb", [
+        MetricGroup("lpm_itlb_ov", [
+            Metric("lpm_itlb_ov_insn_bt_l1_miss",
+                   "Number of instructions between l1 misses", d_ratio(
+                       ins, l1m), "insns"),
+            Metric("lpm_itlb_ov_insn_bt_l2_miss",
+                   "Number of instructions between l2 misses", d_ratio(
+                       ins, l2m), "insns"),
+        ]),
+        itlb_l1_mg,
+        MetricGroup("lpm_itlb_l2", [
+            Metric("lpm_itlb_l2_hits",
+                   "L2 ITLB hits as a percentage of all L2 ITLB accesses.",
+                   d_ratio(l2h, l2r), "100%"),
+            Metric("lpm_itlb_l2_miss",
+                   "L2 ITLB misses as a percentage of all L2 ITLB accesses.",
+                   d_ratio(l2m, l2r), "100%"),
+            Metric("lpm_itlb_l2_reqs", "ITLB accesses per second.",
+                   d_ratio(l2r, interval_sec), "accesses/sec"),
+        ]),
+    ], description="Instruction TLB breakdown")
+
+
 def AmdHwpf():
     """Returns a MetricGroup representing AMD hardware prefetch metrics."""
     global _zen_model
@@ -350,6 +398,7 @@ def main() -> None:
 
     all_metrics = MetricGroup("", [
         AmdBr(),
+        AmdItlb(),
         AmdHwpf(),
         AmdSwpf(),
         AmdUpc(),
-- 
2.51.2.1041.gc1ab5b90ca-goog