How to confirm whether __GI___clock_gettime() implemented as fast system call or not on x86_64 platform with Linux 4.19.84?

[Vivek Das Mohapatra]

>> How can I confirm whether __GI___clock_gettime() implemented as fast
>> system call or not on x86_64 platform with Linux 4.19.84?

If you're looking for the VDSO fast path I had to knock up
this tool a few years ago to check whether it was being
followed (instructions included).

https://gitlab.collabora.com/vivek/syscall-vdso-test