[PATCH v1 10/13] perf jevents: Add load store breakdown metrics ldst for AMD

Ian Rogers
2024-02-29T00:16:06Z

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@google.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 f4a4ece551ef..6b182a9bbfe5 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -278,6 +278,80 @@ 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."""
if zen_model <= 1:
@@ -488,6 +562,7 @@ all_metrics = MetricGroup("", [
AmdBr(),
AmdDtlb(),
AmdItlb(),
+ AmdLdSt(),
AmdHwpf(),
AmdSwpf(),
AmdUpc(),
--
2.44.0.278.ge034bb2e1d-goog