[PATCH v3 10/12] perf jevents: Add load store breakdown metrics ldst for AMD

[Ian Rogers]

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@xxxxxxxxxx>
---
 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 79312e33c2d0..2fc8064e4fc0 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -275,6 +275,80 @@ 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("ldst", [
+      MetricGroup("ldst_total", [
+          Metric("ldst_total_ld", "Number of loads dispatched per second.",
+                 ld_rate, "insns/sec"),
+          Metric("ldst_total_st", "Number of stores dispatched per second.",
+                 st_rate, "insns/sec"),
+      ]),
+      MetricGroup("ldst_percent_insn", [
+          Metric("ldst_percent_insn_ld",
+                 "Load instructions as a percentage of all instructions.",
+                 d_ratio(ldst_ld, ins), "100%"),
+          Metric("ldst_percent_insn_st",
+                 "Store instructions as a percentage of all instructions.",
+                 d_ratio(ldst_st, ins), "100%"),
+      ]),
+      MetricGroup("ldst_ret_loads_per_cycle", [
+          Metric(
+              "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(
+              "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(
+              "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("ldst_ret_stores_per_cycle", [
+          Metric(
+              "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(
+              "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(
+              "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("ldst_insn_bt", [
+          Metric("ldst_insn_bt_ld", "Number of instructions between loads.",
+                 d_ratio(ins, ldst_ld), "insns"),
+          Metric("ldst_insn_bt_st", "Number of instructions between stores.",
+                 d_ratio(ins, ldst_st), "insns"),
+      ])
+  ], description="Breakdown of load/store instructions")
+
+
 def AmdHwpf():
   """Returns a MetricGroup representing AMD hardware prefetch metrics."""
   global _zen_model
@@ -512,6 +586,7 @@ def main() -> None:
       AmdBr(),
       AmdDtlb(),
       AmdItlb(),
+      AmdLdSt(),
       AmdHwpf(),
       AmdSwpf(),
       AmdUpc(),
-- 
2.44.0.278.ge034bb2e1d-goog