RFR 8161445: [BACKOUT] MemberNameTable doesn't purge stale entries

[Coleen Phillimore]

Thanks David.
Coleen

On 7/31/16 8:46 PM, David Holmes wrote:
> Hi Coleen,
>
> Looks like a clean reversal of the original changes to me.
>
> Thanks,
> David
>
> On 30/07/2016 3:52 AM, Coleen Phillimore wrote:
>> Summary: Original change caused performance regression in
>> microbenchmarks after GC
>>
>> Eric Caspole's additional performance measurements are in the bug
>> report.  Also, I don't think it was a good idea for the jvm to intern
>> MemberName assuming they are immutable.   The interning should be in
>> Java code.  I didn't see a huge advantage to interning these as there
>> weren't a big proportion of duplicates that I could see in my logging.
>> I added a REDO bug and contacted the submitter for the severity of this
>> problem in real life, since what they sent was a microbenchmark as well.
>>
>> Tested with JPRT and original test case.  The backout was clean and had
>> no conflicts.
>>
>> open webrev at http://cr.openjdk.java.net/~coleenp/8161445/webrev
>> bug link https://bugs.openjdk.java.net/browse/JDK-8161445
>>
>> Thanks,
>> Coleen