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