[Vm-dev] Immutability through hardware
Igor Stasenko
siguctua at gmail.com
Mon May 9 12:16:00 UTC 2011
Just a follow-up to recent thread.
Suppose that we have new object format which supports multiple memory regions.
I.e.
eden space
old space
pinned space
...
and
immutable space
so, instead of adding a flag per object whether its immutable or not,
and then check this flag every time there is a write attempt,
we could simply let hardware handle this.
And immutable space is a memory region with read-only access, So once
placed & sealed , any attempt to write, we lead to a hardware
exception,
which can be nicely handled :)
So, we will have a single entry point for all write access , and don't
need to spread an immutability logic all over the places.
And of course hardware 'check if memory is writeable' is much faster
than software one.
What you think?
--
Best regards,
Igor Stasenko AKA sig.
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