[PATCH v1 15/20] perf jevents: Add mem_bw metric for Intel

Ian Rogers
2024-02-29T00:18:59Z

Break down memory bandwidth using uncore counters. For many models
this matches the memory_bandwidth_* metrics, but these metrics aren't
made available on all models. Add support for free running counters.
Query the event json when determining which what events/counters are
available.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/pmu-events/intel_metrics.py | 62 ++++++++++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index e373f87d499d..8d02be83b491 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -800,6 +800,67 @@ def IntelLdSt() -> Optional[MetricGroup]:
], description = "Breakdown of load/store instructions")

+def UncoreMemBw() -> Optional[MetricGroup]:
+ mem_events = []
+ try:
+ mem_events = json.load(open(f"{os.path.dirname(os.path.realpath(__file__))}"
+ f"/arch/x86/{args.model}/uncore-memory.json"))
+ except:
+ pass
+
+ ddr_rds = 0
+ ddr_wrs = 0
+ ddr_total = 0
+ for x in mem_events:
+ if "EventName" in x:
+ name = x["EventName"]
+ if re.search("^UNC_MC[0-9]+_RDCAS_COUNT_FREERUN", name):
+ ddr_rds += Event(name)
+ elif re.search("^UNC_MC[0-9]+_WRCAS_COUNT_FREERUN", name):
+ ddr_wrs += Event(name)
+ #elif re.search("^UNC_MC[0-9]+_TOTAL_REQCOUNT_FREERUN", name):
+ # ddr_total += Event(name)
+
+ if ddr_rds == 0:
+ try:
+ ddr_rds = Event("UNC_M_CAS_COUNT.RD")
+ ddr_wrs = Event("UNC_M_CAS_COUNT.WR")
+ except:
+ return None
+
+ ddr_total = ddr_rds + ddr_wrs
+
+ pmm_rds = 0
+ pmm_wrs = 0
+ try:
+ pmm_rds = Event("UNC_M_PMM_RPQ_INSERTS")
+ pmm_wrs = Event("UNC_M_PMM_WPQ_INSERTS")
+ except:
+ pass
+
+ pmm_total = pmm_rds + pmm_wrs
+
+ scale = 64 / 1_000_000
+ return MetricGroup("mem_bw", [
+ MetricGroup("mem_bw_ddr", [
+ Metric("mem_bw_ddr_read", "DDR memory read bandwidth",
+ d_ratio(ddr_rds, interval_sec), f"{scale}MB/s"),
+ Metric("mem_bw_ddr_write", "DDR memory write bandwidth",
+ d_ratio(ddr_wrs, interval_sec), f"{scale}MB/s"),
+ Metric("mem_bw_ddr_total", "DDR memory write bandwidth",
+ d_ratio(ddr_total, interval_sec), f"{scale}MB/s"),
+ ], description = "DDR Memory Bandwidth"),
+ MetricGroup("mem_bw_pmm", [
+ Metric("mem_bw_pmm_read", "PMM memory read bandwidth",
+ d_ratio(pmm_rds, interval_sec), f"{scale}MB/s"),
+ Metric("mem_bw_pmm_write", "PMM memory write bandwidth",
+ d_ratio(pmm_wrs, interval_sec), f"{scale}MB/s"),
+ Metric("mem_bw_pmm_total", "PMM memory write bandwidth",
+ d_ratio(pmm_total, interval_sec), f"{scale}MB/s"),
+ ], description = "PMM Memory Bandwidth") if pmm_rds != 0 else None,
+ ], description = "Memory Bandwidth")
+
+
all_metrics = MetricGroup("", [
Cycles(),
Idle(),
@@ -815,6 +876,7 @@ all_metrics = MetricGroup("", [
IntelMlp(),
IntelPorts(),
IntelSwpf(),
+ UncoreMemBw(),
])

if args.metricgroups:
--
2.44.0.278.ge034bb2e1d-goog