Re: [Xen-devel] Re: Is continuous replication of state possible?

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

George Washington Dunlap III wrote:

> The main trick is that there are several different counters you could 
> use. The one spoken of mainly in the literature is the instruction 
> counter (which, on both Athlons and P4's is unusable).  However, there 
> are repeatable branch counters on both platforms.  Logging the
> <eip, branch_count> tuple at every interrupt allows us to re-deliver the 
> interrupts precisely.  (See Mellor-Crummey89 for a software version of 
> this same idea.)
> Maybe sometime I'll post a whitepaper about the dirty details of doing 
> deterministic replay on P4's and Athlons.  If you're interested, I have 
> an e-mail that I've already sent to several people (including the Xen 
> team) with the details.
I'd like to see a copy of that email, thanks.

Jacob


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