hotfunc笔记

[envidia linker](https://github.com/NVIDIA/cpu-code-locality-tool)

```
sudo perf record -F 100000 --sample-cpu ./quicksort 
sudo perf script --time=90%-95% --no-demangle > mytrace.txt 
python3 countranges.py --perf-trace mytrace.txt --output                                      
```