Messages in this thread | | | Date | Mon, 29 Oct 2007 16:33:34 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH] raise tsc clocksource rating |
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Ingo Molnar wrote: > i dont remember us having discussed this before, ever. If there's any > "fight" about monotonicity and SMP then it would be a pretty onesided > affair, with you being beaten up seriously ;-) >
This is part of Xen's ABI, so it isn't easily changed. You're right that getting monotonicity is a pretty ugly affair of doing something like "if (now < previous_return) return ++previous_return;", but its better than using the tsc.
(Last time around, it was "Xen can't use the tsc because it can't ever be used as a stable timebase" - though I don't think that was you specifically.)
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