perf pmu-events x86: Use CPU_CLK_UNHALTED.THREAD in Kernel_Utilization metric

The kernel utilization metric does multiplexing currently and is somewhat
unreliable. The problem is that it uses two instances of the fixed counter,
and the kernel has to multipleplex which causes errors. So should use
CPU_CLK_UNHALTED.THREAD instead.

Before:

  # perf stat -M Kernel_Utilization -- sleep 1

  Performance counter stats for 'sleep 1':

          1,419,425      cpu_clk_unhalted.ref_tsc:k
      <not counted>      cpu_clk_unhalted.ref_tsc	(0.00%)

After:

  # perf stat -M Kernel_Utilization -- sleep 1

  Performance counter stats for 'sleep 1':

            746,688      cpu_clk_unhalted.thread:k #      0.7 Kernel_Utilization
          1,088,348      cpu_clk_unhalted.thread

Signed-off-by: Jin Yao <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
Reviewed-by: Kan Liang <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: Jin Yao

tools/perf/pmu-events/arch/x86/broadwell/bdw-metrics.json

@@ -297,7 +297,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/broadwellde/bdwde-metrics.json

@@ -115,7 +115,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json

@@ -297,7 +297,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/cascadelakex/clx-metrics.json

@@ -316,7 +316,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/haswell/hsw-metrics.json

@@ -267,7 +267,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/haswellx/hsx-metrics.json

@@ -267,7 +267,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/ivybridge/ivb-metrics.json

@@ -285,7 +285,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/ivytown/ivt-metrics.json

@@ -285,7 +285,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/jaketown/jkt-metrics.json

@@ -171,7 +171,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },

tools/perf/pmu-events/arch/x86/sandybridge/snb-metrics.json

@@ -171,7 +171,7 @@
     },
     {
         "BriefDescription": "Fraction of cycles spent in Kernel mode",
-        "MetricExpr": "CPU_CLK_UNHALTED.REF_TSC:k / CPU_CLK_UNHALTED.REF_TSC",
+        "MetricExpr": "CPU_CLK_UNHALTED.THREAD:k / CPU_CLK_UNHALTED.THREAD",
         "MetricGroup": "Summary",
         "MetricName": "Kernel_Utilization"
     },