On Sep 9, 2014, at 12:11 AM, Martin Traverso <mtrave...@gmail.com> wrote:
> Hi John,
>
> Thanks for the detailed explanation.
>
> I ran a few additional experiments after I wrote a simpler program to try to
> reproduce the issue. I don't see the permgen leak, so something else must be
> causing it in Presto. I do see the "Loaded..." messages without a
> corresponding "Unloaded...", so your hypothesis about that happening for
> anonymous classes seems likely. Interestingly, it has another side-effect:
> the "Loaded classes" counter in VisualVM and in the ClassLoadingMXBean don't
> seem to work correctly under this scenario.
>
> It also reproduces the issue I mentioned regarding seemingly duplicate LFs.
> The code is here if you want to take a quick look:
> https://github.com/martint/lftest. The weird behavior goes away if I change
> the indy callsite to return Object instead of String
OK, got it. The path through makeReferenceIdentity is not cached in JDK 7 or
8, for reference types other than Object.
The fix for this is pending:
https://bugs.openjdk.java.net/browse/JDK-8050884
http://cr.openjdk.java.net/~vlivanov/lfc/2014-09-03/12.8050884.identity
— John
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