Does this only support x86_64

[Zentrik]

It looks to me that syscall numbers differ on different platforms, so this code is only going to work on x86_64 as https://github.com/torvalds/linux/blob/v4.17/arch/x86/entry/syscalls/syscall_32.tbl#L17 says perf_event_open is 336 on i686

LinuxPerf.jl/src/LinuxPerf.jl

Lines 158 to 168 in b7653aa

	const SYS_perf_event_open = 298
	"""
	perf_event_open(attr::perf_event_attr, pid, cpu, fd, flags)
	"""
	function perf_event_open(attr::perf_event_attr, pid, cpu, leader_fd, flags)
	r_attr = Ref(attr)
	GC.@preserve r_attr begin
	# Have to do a manual conversion, since the ABI is a vararg call
	ptr = Base.unsafe_convert(Ptr{Cvoid}, Base.cconvert(Ptr{Cvoid}, r_attr))
	fd = ccall(:syscall, Cint, (Clong, Clong...), SYS_perf_event_open,

If this package only supports x86_64 I think it makes sense to add to the readme.

[vchuravy]

It should be easy enough to add the branches, but yes I think only x86_64 has ever been tested