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Add extra_flag option to bpf_attach_perf_event_raw
The bpf_attach_perf_event_raw API is designed to provide maximum flexibility for people to use advanced features of Kernel Perf Events with BPF. Some times specifying flags is neccesary, such as if we want to use `PERF_FLAG_PID_CGROUP` to profile a container. This commit adds `extra_flag` option to C and C++ interface
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