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[Bug runtime/3916] improve timing monotony
- From: "joshua dot i dot stone at intel dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 16 Aug 2007 16:17:49 -0000
- Subject: [Bug runtime/3916] improve timing monotony
- References: <20070124160955.3916.fche@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- 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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