JIT and invalidation

[Jeroen Frijters]

Hi Rémi,

I believe this is not actually safe. There is no guarantee that when SwitchPoint.invalidateAll() returns that all calls to GET_BYTE or PUT_BYTE that were in flight have completed.

Regards,
Jeroen

> -----Original Message-----
> From: mlvm-dev-bounces at openjdk.java.net [mailto:mlvm-dev-
> bounces at openjdk.java.net] On Behalf Of Remi Forax
> Sent: Sunday, February 16, 2014 22:54
> To: Da Vinci Machine Project
> Subject: JIT and invalidation
> 
> Hi John, Hi Christian, Hi all,
> I don't know if you can test this little code, but when I run it on my
> laptop (linux 64bits) it can terminate in 45s or 2 minutes, it seems
> that it depends on the order the JIT compiles the method handles.
>    https://gist.github.com/forax/9041030
> 
> Sometimes it also PrintCompilation can also prints 'COMPILE SKIPPED:
> invalid non-klass dependency'.
> 
> BTW, the code allows to safely* map and unmap a 32G file without not
> always paying the cost of the runtime check that test if the array is
> unmaped or not :)
> 
> cheers,
> Rémi
> * I believe.
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