iovisor / iovisor/bcc

tools/funcslower.py:support for the trace of nested functions

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Description

`tools/funcslower.py`

```
NOTE: This tool cannot trace nested functions in the same invocation
due to instrumentation specifics, only innermost calls will be visible.
```

Sometimes the slowness of the function is caused by too much nesting. Would it be better to calculate the elapsed time of the outermost?

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