[PATCH v1 18/20] perf jevents: Add C-State metrics from the PCU PMU for Intel

Ian Rogers
2024-02-29T00:19:07Z

Use occupancy events fixed in:
https://lore.kernel.org/lkml/20240226201517.3540187-1-irogers@google.com/

Metrics are at the socket level referring to cores, not hyperthreads.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/pmu-events/intel_metrics.py | 27 ++++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 07aafdf77f79..1b9f7cd3b789 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -800,6 +800,32 @@ def IntelLdSt() -> Optional[MetricGroup]:
], description = "Breakdown of load/store instructions")

+def UncoreCState() -> Optional[MetricGroup]:
+ try:
+ pcu_ticks = Event("UNC_P_CLOCKTICKS")
+ c0 = Event("UNC_P_POWER_STATE_OCCUPANCY.CORES_C0")
+ c3 = Event("UNC_P_POWER_STATE_OCCUPANCY.CORES_C3")
+ c6 = Event("UNC_P_POWER_STATE_OCCUPANCY.CORES_C6")
+ except:
+ return None
+
+ num_cores = Literal("#num_cores") / Literal("#num_packages")
+
+ max_cycles = pcu_ticks * num_cores;
+ total_cycles = c0 + c3 + c6
+
+ # remove fused-off cores which show up in C6/C7.
+ c6 = Select(max(c6 - (total_cycles - max_cycles), 0),
+ total_cycles > max_cycles,
+ c6)
+
+ return MetricGroup("cstate", [
+ Metric("cstate_c0", "C-State cores in C0/C1", d_ratio(c0, pcu_ticks), "cores"),
+ Metric("cstate_c3", "C-State cores in C3", d_ratio(c3, pcu_ticks), "cores"),
+ Metric("cstate_c6", "C-State cores in C6/C7", d_ratio(c6, pcu_ticks), "cores"),
+ ])
+
+
def UncoreDir() -> Optional[MetricGroup]:
try:
m2m_upd = Event("UNC_M2M_DIRECTORY_UPDATE.ANY")
@@ -937,6 +963,7 @@ all_metrics = MetricGroup("", [
IntelMlp(),
IntelPorts(),
IntelSwpf(),
+ UncoreCState(),
UncoreDir(),
UncoreMem(),
UncoreMemBw(),
--
2.44.0.278.ge034bb2e1d-goog