Allow duplicated metric to be dropped from json files.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/pmu-events/intel_metrics.py | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 2622d4e5ff54..81879e68da96 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 from metric import (d_ratio, has_event, max, Event, JsonEncodeMetric,
                     JsonEncodeMetricGroupDescriptions, LoadEvents, Metric,
-                    MetricGroup, Select)
+                    MetricGroup, MetricRef, Select)
 import argparse
 import json
 import math
@@ -62,9 +62,28 @@ def Rapl() -> MetricGroup:
                      description="Running Average Power Limit (RAPL) power consumption estimates")
 
 
+def Smi() -> MetricGroup:
+    aperf = Event('msr/aperf/')
+    cycles = Event('cycles')
+    smi_num = Event('msr/smi/')
+    smi_cycles = Select(Select((aperf - cycles) / aperf, smi_num > 0, 0),
+                        has_event(aperf),
+                        0)
+    return MetricGroup('smi', [
+        Metric('smi_num', 'Number of SMI interrupts.',
+               Select(smi_num, has_event(smi_num), 0), 'SMI#'),
+        # Note, the smi_cycles "Event" is really a reference to the metric.
+        Metric('smi_cycles',
+               'Percentage of cycles spent in System Management Interrupts. '
+               'Requires /sys/devices/cpu/freeze_on_smi to be 1.',
+               smi_cycles, '100%', threshold=(MetricRef('smi_cycles') > 0.10))
+    ], description = 'System Management Interrupt metrics')
+
+
 all_metrics = MetricGroup("", [
     Idle(),
     Rapl(),
+    Smi(),
 ])
 
 if args.metricgroups:
-- 
2.44.0.278.ge034bb2e1d-goog