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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 <yao.jin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200309013125.7559-1-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2020-03-09 09:31:25 +08:00 committed by Arnaldo Carvalho de Melo
parent 47327f5667
commit 8ed1faf015
12 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/pmu-events/arch/x86/broadwell/bdw-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/broadwellde/bdwde-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/cascadelakex/clx-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/haswell/hsw-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/haswellx/hsx-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/ivybridge/ivb-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/ivytown/ivt-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/jaketown/jkt-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/sandybridge/snb-metrics.json
View File

@ -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"
},

2
tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json
View File

@ -304,7 +304,7 @@
},
{
"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"
},

2
tools/perf/pmu-events/arch/x86/skylakex/skx-metrics.json
View File

@ -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"
},