1. 根目录:
2. tools
3. perf
4. bench
5. mem-memcpy-x86-64-asm-def.h

MEMCPY_FN(__memcpy,
	"x86-64-unrolled",
	"unrolled memcpy() in arch/x86/lib/memcpy_64.S")

MEMCPY_FN(memcpy_c,
	"x86-64-movsq",
	"movsq-based memcpy() in arch/x86/lib/memcpy_64.S")

MEMCPY_FN(memcpy_c_e,
	"x86-64-movsb",
	"movsb-based memcpy() in arch/x86/lib/memcpy_64.S")