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From Robin Garner <robin.gar...@anu.edu.au>
Subject Re: [drlvm] Class unloading support - tested one approach
Date Thu, 09 Nov 2006 12:53:53 GMT
Etienne Gagnon wrote:
> Alexey Varlamov wrote:
>> Sorry if it was already discussed, but I believe this approach also
>> requires marking vtable bit/byte on each object allocation, unitl the
>> "unloading" GC pass is strictly stop-the-world full-heap collection.
>> Robin, did you include this particular overhead too in your
>> measurements?

I didn't include it - having established that it's cheap during GC where 
memory bandwidth is at a premium, I kind of took this for granted.

> My proposal already argued that vtable bit/byte/word marking is
> unnecessary for "nursery allocations".  You only need to mark the vtable
> of objects that survive collection and pretenured objects.

And this is a persuasive argument.  But I can probably find time to 
measure it tomorrow if you aren't convinced.

Robin Garner
Dept. of Computer Science
Australian National University

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