[Bug runtime/3916] improve timing monotony

[joshua dot i dot stone at intel dot com]

------- Additional Comments From joshua dot i dot stone at intel dot com  2007-08-16 16:17 -------
(In reply to comment #5)
> However, I think this still needs to be discussed (especially, 
> about Core/Core2 architecture and newer AMD processors).

There is a synthesized cpu feature flag X86_FEATURE_CONSTANT_TSC, added in
2.6.13 for x86_64 and 2.6.16 for i386.  Further, in 2.6.18 there's a tsc_khz
variable as a companion to the cpu_khz, and a check_tsc_unstable().

So hopefully we can make use of these features, though we'll need to gate it
with autoconf to continue supporting older kernels.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=3916

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