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

[孙世龙 sunshilong]

Hi, vivek

Thank you for your generous help.
I have carefully studied your tool. But I have found it only supports
several functions(i.e. time, gettimeofday, time and etc), not
including clock_getime.





On Fri, Jul 24, 2020 at 10:03 PM Vivek Das Mohapatra
<vivek@collabora.com> wrote:
>
> >> 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
>