linux-kernel - [PATCH v9 22/48] perf jevents: Add load store breakdown metrics ldst for AMD

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Message-ID: <20251202175043.623597-23-irogers@google.com>
Date: Tue,  2 Dec 2025 09:50:17 -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 v9 22/48] perf jevents: Add load store breakdown metrics ldst
 for AMD

Give breakdown of number of instructions. Use the counter mask (cmask)
to show the number of cycles taken to retire the instructions.

Signed-off-by: Ian Rogers <irogers@...gle.com>
Reviewed-by: Sandipan Das <sandipan.das@....com>
---
 tools/perf/pmu-events/amd_metrics.py | 75 ++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 6542c334a82b..1611d0e50d03 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -279,6 +279,80 @@ def AmdItlb():
     ], description="Instruction TLB breakdown")
 
 
+def AmdLdSt() -> MetricGroup:
+    ldst_ld = Event("ls_dispatch.ld_dispatch")
+    ldst_st = Event("ls_dispatch.store_dispatch")
+    ldst_ldc1 = Event(f"{ldst_ld}/cmask=1/")
+    ldst_stc1 = Event(f"{ldst_st}/cmask=1/")
+    ldst_ldc2 = Event(f"{ldst_ld}/cmask=2/")
+    ldst_stc2 = Event(f"{ldst_st}/cmask=2/")
+    ldst_ldc3 = Event(f"{ldst_ld}/cmask=3/")
+    ldst_stc3 = Event(f"{ldst_st}/cmask=3/")
+    ldst_cyc = Event("ls_not_halted_cyc")
+
+    ld_rate = d_ratio(ldst_ld, interval_sec)
+    st_rate = d_ratio(ldst_st, interval_sec)
+
+    ld_v1 = max(ldst_ldc1 - ldst_ldc2, 0)
+    ld_v2 = max(ldst_ldc2 - ldst_ldc3, 0)
+    ld_v3 = ldst_ldc3
+
+    st_v1 = max(ldst_stc1 - ldst_stc2, 0)
+    st_v2 = max(ldst_stc2 - ldst_stc3, 0)
+    st_v3 = ldst_stc3
+
+    return MetricGroup("lpm_ldst", [
+        MetricGroup("lpm_ldst_total", [
+            Metric("lpm_ldst_total_ld", "Number of loads dispatched per second.",
+                   ld_rate, "insns/sec"),
+            Metric("lpm_ldst_total_st", "Number of stores dispatched per second.",
+                   st_rate, "insns/sec"),
+        ]),
+        MetricGroup("lpm_ldst_percent_insn", [
+            Metric("lpm_ldst_percent_insn_ld",
+                   "Load instructions as a percentage of all instructions.",
+                   d_ratio(ldst_ld, ins), "100%"),
+            Metric("lpm_ldst_percent_insn_st",
+                   "Store instructions as a percentage of all instructions.",
+                   d_ratio(ldst_st, ins), "100%"),
+        ]),
+        MetricGroup("lpm_ldst_ret_loads_per_cycle", [
+            Metric(
+                "lpm_ldst_ret_loads_per_cycle_1",
+                "Load instructions retiring in 1 cycle as a percentage of all "
+                "unhalted cycles.", d_ratio(ld_v1, ldst_cyc), "100%"),
+            Metric(
+                "lpm_ldst_ret_loads_per_cycle_2",
+                "Load instructions retiring in 2 cycles as a percentage of all "
+                "unhalted cycles.", d_ratio(ld_v2, ldst_cyc), "100%"),
+            Metric(
+                "lpm_ldst_ret_loads_per_cycle_3",
+                "Load instructions retiring in 3 or more cycles as a percentage"
+                "of all unhalted cycles.", d_ratio(ld_v3, ldst_cyc), "100%"),
+        ]),
+        MetricGroup("lpm_ldst_ret_stores_per_cycle", [
+            Metric(
+                "lpm_ldst_ret_stores_per_cycle_1",
+                "Store instructions retiring in 1 cycle as a percentage of all "
+                "unhalted cycles.", d_ratio(st_v1, ldst_cyc), "100%"),
+            Metric(
+                "lpm_ldst_ret_stores_per_cycle_2",
+                "Store instructions retiring in 2 cycles as a percentage of all "
+                "unhalted cycles.", d_ratio(st_v2, ldst_cyc), "100%"),
+            Metric(
+                "lpm_ldst_ret_stores_per_cycle_3",
+                "Store instructions retiring in 3 or more cycles as a percentage"
+                "of all unhalted cycles.", d_ratio(st_v3, ldst_cyc), "100%"),
+        ]),
+        MetricGroup("lpm_ldst_insn_bt", [
+            Metric("lpm_ldst_insn_bt_ld", "Number of instructions between loads.",
+                   d_ratio(ins, ldst_ld), "insns"),
+            Metric("lpm_ldst_insn_bt_st", "Number of instructions between stores.",
+                   d_ratio(ins, ldst_st), "insns"),
+        ])
+    ], description="Breakdown of load/store instructions")
+
+
 def AmdUpc() -> Metric:
     ops = Event("ex_ret_ops", "ex_ret_cops")
     upc = d_ratio(ops, smt_cycles)
@@ -365,6 +439,7 @@ def main() -> None:
         AmdBr(),
         AmdDtlb(),
         AmdItlb(),
+        AmdLdSt(),
         AmdUpc(),
         Idle(),
         Rapl(),
-- 
2.52.0.158.g65b55ccf14-goog