add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/tools/perf/pmu-events/arch/x86/broadwellde/bdwde-metrics.json
..
..
@@ -115,7 +115,7 @@
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     },
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     {
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         "BriefDescription": "Fraction of cycles spent in Kernel mode",
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-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:u / CPU_CLK_UNHALTED.REF_TSC",
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+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
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         "MetricGroup": "Summary",
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         "MetricName": "Kernel_Utilization"
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     },