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| author | Jin Yao <yao.jin@linux.intel.com> | 2020-03-09 09:31:25 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-04-03 09:37:56 -0300 |
| commit | 8ed1faf0156e569c46f1b3d59e74c9cbd5e557ff (patch) | |
| tree | 79d3e467e03eb0df1200c203f726ef0015ecafe7 /tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json | |
| parent | 47327f56674d69a423f7167f8d4ea537cc1762cc (diff) | |
| download | linux-8ed1faf0156e569c46f1b3d59e74c9cbd5e557ff.tar.gz linux-8ed1faf0156e569c46f1b3d59e74c9cbd5e557ff.tar.bz2 linux-8ed1faf0156e569c46f1b3d59e74c9cbd5e557ff.zip | |
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>
Diffstat (limited to 'tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json')
| -rw-r--r-- | tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json b/tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json index 746734ce09be..1eb0415fa11a 100644 --- a/tools/perf/pmu-events/arch/x86/broadwellx/bdx-metrics.json +++ b/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" }, |