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perf jevents: Add C-State metrics from the PCU PMU for Intel

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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>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Edward Baker <edward.baker@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xu Yang <xu.yang_2@nxp.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2026-01-27 10:45:01 -08:00 committed by Arnaldo Carvalho de Melo
parent 2166b44be9
commit 1fee2701a7
1 changed files with 30 additions and 0 deletions
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30
tools/perf/pmu-events/intel_metrics.py
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@ -815,6 +815,35 @@ 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("lpm_cstate", [
Metric("lpm_cstate_c0", "C-State cores in C0/C1",
d_ratio(c0, pcu_ticks), "cores"),
Metric("lpm_cstate_c3", "C-State cores in C3",
d_ratio(c3, pcu_ticks), "cores"),
Metric("lpm_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")
@ -979,6 +1008,7 @@ def main() -> None:
IntelMlp(),
IntelPorts(),
IntelSwpf(),
UncoreCState(),
UncoreDir(),
UncoreMem(),
UncoreMemBw(),