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单板启动后，会经常看到提示“perf interrupt took too long (n > x）”，这样的打印信息。
相关配置参数有：
/proc/sys/kernel/下
perf_cpu_time_max_percent： perf分析工具最大能够占用CPU性能的百分比0：不限制1~100：百分比值
perf_event_max_sample_rate： 设置perf_event的最大取样速率，默认值为100000
perf采样使用会占用cpu，所以默认限制最大是perf_cpu_time_max_percent=25
超过就会触发上面这个告警，并调整采样速率，保持不要超过限制，也就是说如果你设置了perf_event_max_sample_rate。
那么出现上面这个告警后，perf_event_max_sample_rate的值会被调整。
可以通过调高perf_cpu_time_max_percent来解决。
如果调高也不能解决，就设置为0，此时就不会在去监控cpu的占用率了。
echo 0 > /proc/sys/kernel/perf_cpu_time_max_percent
echo 10000 > /proc/sys/kernel/perf_event_max_sample_rate
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