RFR (XS) 8210559: ClassLoaderData Symbols can leak

Ioi Lam ioi.lam at oracle.com
Thu Sep 13 00:03:24 UTC 2018

Hi Coleen,

The changes look good.

I am wondering if we should add a WhiteBox function to test whether a 
given Symbol is alive. That way, you can write a test case to ensure 
that after the CLD is destroyed, its name will be removed from the 

I know tests cases are a hassle, but I think in the long run that would 
be beneficial.


- Ioi

On 9/12/18 4:32 PM, coleen.phillimore at oracle.com wrote:
> Summary: unrefcount the symbol names when the CLD is destroyed
> I was going to clean up the sometimes null value of _name and 
> _name_and_id, and have the boot classloader data have a name, but 
> there's a bootstrapping problem.  NULL CLD is created before the 
> SymbolTable.  So this wasn't done.
> Tested with mach5 hs-tier1-3, and runThese jck which does a lot of 
> class unloading.
> open webrev at http://cr.openjdk.java.net/~coleenp/8210559.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8210559
> Thanks,
> Coleen

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