Re: [Xen-devel] RE: [PATCH] rendezvous-based local time calibration WOW!

[John Levon <levon@xxxxxxxxxxxxxxxxx>]

On Mon, Aug 11, 2008 at 03:50:57PM +0100, Keir Fraser wrote:

> >> What guarantee are you providing? Per thread, per address space, or global
> >> monotonicity?
> > 
> > Per thread non-strict monotonicity.
> 
> Doesn't this just require thread-local storage and no lock?

The above is what we guarantee but it's not how it's implemented. All of
that is based upon the per-CPU hrtime, so we need the lock (or a
wholesale rework of how hrtime is managed in the Solaris kernel: that's
not going to happen :)

regards
john

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