[Bug libc/21305] clock_gettime(CLOCK_MONOTONIC_RAW) can and should use rdtsc instructions instead of entering kernel through VDSO

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21305

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Does your kernel actually implement CLOCK_MONOTONIC_RAW in the vDSO?  I think
upstream doesn't do that.

I don't see why your proposed performance enhancement couldn't be applied to
the vDSO itself.  I don't think it is a good idea to put detailed knowledge
about system clocks into glibc.

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