[PATCH v1 11/13] perf jevents: Add ILP metrics for AMD

Ian Rogers
2024-02-29T00:16:09Z

Use the counter mask (cmask) to see how many cycles an instruction
takes to retire. Present as a set of ILP metrics.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/pmu-events/amd_metrics.py | 30 ++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 6b182a9bbfe5..91f323c1a149 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -125,6 +125,35 @@ def AmdBr():
description="breakdown of retired branch instructions")

+def AmdIlp() -> MetricGroup:
+ tsc = Event("msr/tsc/")
+ c0 = Event("msr/mperf/")
+ low = tsc - c0
+ inst_ret = Event("ex_ret_instr")
+ inst_ret_c = [Event(f"{inst_ret.name}/cmask={x}/") for x in range(1, 6)]
+ ilp = [d_ratio(max(inst_ret_c[x] - inst_ret_c[x + 1], 0), cycles) for x in range(0, 4)]
+ ilp.append(d_ratio(inst_ret_c[4], cycles))
+ ilp0 = 1
+ for x in ilp:
+ ilp0 -= x
+ return MetricGroup("ilp", [
+ Metric("ilp_idle", "Lower power cycles as a percentage of all cycles",
+ d_ratio(low, tsc), "100%"),
+ Metric("ilp_inst_ret_0", "Instructions retired in 0 cycles as a percentage of all cycles",
+ ilp0, "100%"),
+ Metric("ilp_inst_ret_1", "Instructions retired in 1 cycles as a percentage of all cycles",
+ ilp[0], "100%"),
+ Metric("ilp_inst_ret_2", "Instructions retired in 2 cycles as a percentage of all cycles",
+ ilp[1], "100%"),
+ Metric("ilp_inst_ret_3", "Instructions retired in 3 cycles as a percentage of all cycles",
+ ilp[2], "100%"),
+ Metric("ilp_inst_ret_4", "Instructions retired in 4 cycles as a percentage of all cycles",
+ ilp[3], "100%"),
+ Metric("ilp_inst_ret_5", "Instructions retired in 5 or more cycles as a percentage of all cycles",
+ ilp[4], "100%"),
+ ])
+
+
def AmdDtlb() -> Optional[MetricGroup]:
if zen_model >= 4:
return None
@@ -560,6 +589,7 @@ def UncoreL3():

all_metrics = MetricGroup("", [
AmdBr(),
+ AmdIlp(),
AmdDtlb(),
AmdItlb(),
AmdLdSt(),
--
2.44.0.278.ge034bb2e1d-goog