Justin C. Miller a03804b09d [kernel] Add RAII profiler object ...

Added profiler.h which defines classes and macros for defining profiler
objects. Also added gdb command j6prof for printing profile data. Added
the syscall_profiles profiler class and auto wrapping of syscalls with
profile objects.

Other changes in this commit:

- Made the gdb command `j6threads` argument for specifying a CPU
  optional. Without an argument, it loops through all CPUs.
- Switched to -mcmodel=kernel for kernel code, which makes `call`
  instructions easier to follow when debugging / looking at disassembly.

2022-02-26 13:19:21 -08:00

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