From: Ian Rogers <irogers@google.com>
Date: Tue, 27 Jan 2026 18:44:41 +0000 (-0800)
Subject: perf jevents: Add load store breakdown metrics ldst for AMD
X-Git-Tag: v7.0-rc1~16^2~81
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb4c0581740d99029761f4ad84fc0dbc48913eea;p=thirdparty%2Flinux.git

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.

Reviewed-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Edward Baker <edward.baker@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xu Yang <xu.yang_2@nxp.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index d71997177239..b3de74babe40 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -280,6 +280,80 @@ def AmdItlb():
     ], description="Instruction TLB breakdown")
 
 
+def AmdLdSt() -> MetricGroup:
+    ldst_ld = Event("ls_dispatch.pure_ld", "ls_dispatch.ld_dispatch")
+    ldst_st = Event("ls_dispatch.pure_st", "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)
@@ -366,6 +440,7 @@ def main() -> None:
         AmdBr(),
         AmdDtlb(),
         AmdItlb(),
+        AmdLdSt(),
         AmdUpc(),
         Idle(),
         Rapl(),