review of Projects/replay_cache_collision_avoidance, ending Jan. 12

Tom Yu tlyu at MIT.EDU
Mon Dec 29 14:35:24 EST 2008

Sam Hartman <hartmans at MIT.EDU> writes:

>>>>>> "Greg" == Greg Hudson <ghudson at MIT.EDU> writes:
>     Greg> On Mon, 2008-12-29 at 08:02 -0500, Tom Yu wrote:
>     >> What proportion of false positives is acceptable in a
>     >> mixed-code deployment?
>     Greg> I think mixed-code deployments are going to be rare.  It's
>     Greg> good that we're going to effort to prevent things from
>     Greg> breaking in such deployments, but I don't think we need to
>     Greg> bend over backwards to ensure that we still get a reduction
>     Greg> in false positives in such environments.
> Greg, here are things that I think will make mixed-code reasonably common.
> * Using the native Java interface  along side an OS library
> * different 64-bit and 32-bit libraries

64-bit vs 32-bit could be problematic if the two architectures have
different sizes for "int".

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