[PATCH v3 13/20] perf jevents: Add FPU metrics for Intel

[Ian Rogers]

Metrics break down of floating point operations.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/pmu-events/intel_metrics.py | 90 ++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 387981d58320..da97a1781be7 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -320,6 +320,95 @@ def IntelCtxSw() -> MetricGroup:
                                     "retired & core cycles between context switches"))
 
 
+def IntelFpu() -> Optional[MetricGroup]:
+  cyc = Event("cycles")
+  try:
+    s_64 = Event("FP_ARITH_INST_RETIRED.SCALAR_SINGLE",
+                 "SIMD_INST_RETIRED.SCALAR_SINGLE")
+  except:
+    return None
+  d_64 = Event("FP_ARITH_INST_RETIRED.SCALAR_DOUBLE",
+               "SIMD_INST_RETIRED.SCALAR_DOUBLE")
+  s_128 = Event("FP_ARITH_INST_RETIRED.128B_PACKED_SINGLE",
+                "SIMD_INST_RETIRED.PACKED_SINGLE")
+
+  flop = s_64 + d_64 + 4 * s_128
+
+  d_128 = None
+  s_256 = None
+  d_256 = None
+  s_512 = None
+  d_512 = None
+  try:
+    d_128 = Event("FP_ARITH_INST_RETIRED.128B_PACKED_DOUBLE")
+    flop += 2 * d_128
+    s_256 = Event("FP_ARITH_INST_RETIRED.256B_PACKED_SINGLE")
+    flop += 8 * s_256
+    d_256 = Event("FP_ARITH_INST_RETIRED.256B_PACKED_DOUBLE")
+    flop += 4 * d_256
+    s_512 = Event("FP_ARITH_INST_RETIRED.512B_PACKED_SINGLE")
+    flop += 16 * s_512
+    d_512 = Event("FP_ARITH_INST_RETIRED.512B_PACKED_DOUBLE")
+    flop += 8 * d_512
+  except:
+    pass
+
+  f_assist = Event("ASSISTS.FP", "FP_ASSIST.ANY", "FP_ASSIST.S")
+  if f_assist in [
+      "ASSISTS.FP",
+      "FP_ASSIST.S",
+  ]:
+    f_assist += "/cmask=1/"
+
+  flop_r = d_ratio(flop, interval_sec)
+  flop_c = d_ratio(flop, cyc)
+  nmi_constraint = MetricConstraint.GROUPED_EVENTS
+  if f_assist.name == "ASSISTS.FP": # Icelake+
+    nmi_constraint = MetricConstraint.NO_GROUP_EVENTS_NMI
+  def FpuMetrics(group: str, fl: Optional[Event], mult: int, desc: str) -> Optional[MetricGroup]:
+    if not fl:
+      return None
+
+    f = fl * mult
+    fl_r = d_ratio(f, interval_sec)
+    r_s = d_ratio(fl, interval_sec)
+    return MetricGroup(group, [
+        Metric(f"{group}_of_total", desc + " floating point operations per second",
+               d_ratio(f, flop), "100%"),
+        Metric(f"{group}_flops", desc + " floating point operations per second",
+               fl_r, "flops/s"),
+        Metric(f"{group}_ops", desc + " operations per second",
+               r_s, "ops/s"),
+    ])
+
+  return MetricGroup("fpu", [
+      MetricGroup("fpu_total", [
+          Metric("fpu_total_flops", "Floating point operations per second",
+                 flop_r, "flops/s"),
+          Metric("fpu_total_flopc", "Floating point operations per cycle",
+                 flop_c, "flops/cycle", constraint=nmi_constraint),
+      ]),
+      MetricGroup("fpu_64", [
+          FpuMetrics("fpu_64_single", s_64, 1, "64-bit single"),
+          FpuMetrics("fpu_64_double", d_64, 1, "64-bit double"),
+      ]),
+      MetricGroup("fpu_128", [
+          FpuMetrics("fpu_128_single", s_128, 4, "128-bit packed single"),
+          FpuMetrics("fpu_128_double", d_128, 2, "128-bit packed double"),
+      ]),
+      MetricGroup("fpu_256", [
+          FpuMetrics("fpu_256_single", s_256, 8, "128-bit packed single"),
+          FpuMetrics("fpu_256_double", d_256, 4, "128-bit packed double"),
+      ]),
+      MetricGroup("fpu_512", [
+          FpuMetrics("fpu_512_single", s_512, 16, "128-bit packed single"),
+          FpuMetrics("fpu_512_double", d_512, 8, "128-bit packed double"),
+      ]),
+      Metric("fpu_assists", "FP assists as a percentage of cycles",
+             d_ratio(f_assist, cyc), "100%"),
+  ])
+
+
 def IntelIlp() -> MetricGroup:
   tsc = Event("msr/tsc/")
   c0 = Event("msr/mperf/")
@@ -703,6 +792,7 @@ def main() -> None:
       Tsx(),
       IntelBr(),
       IntelCtxSw(),
+      IntelFpu(),
       IntelIlp(),
       IntelL2(),
       IntelLdSt(),
-- 
2.44.0.278.ge034bb2e1d-goog