cpu_watcher：schedule_delay功能扩充&sar功能适配controller #830
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vvzxy
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zhangzihengya,
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LinkinPF and
chenamy2017
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@zhangzihengya review一下 |
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1.schedule_delay增加功能：打印出高于调度延迟阈值的task前两个调度的同一cpu的task.
在发现调度延迟的情况下，必然是由于其他的task的抢占导致。那么可能是某一个task，或者某几个task。那么在抓到了调度延迟的时候，把前面的task也打印出来，那么大概率是可以发现是哪个task抢占的CPU时间。
2.sar功能适配controller,使用controller控制动态调整输出策略