8151460: Metaspace counters can have inconsistent values

[Per Liden]

On 2016-03-22 14:35, Stefan Johansson wrote:
> Hi,
>
> Please review this test-fix to avoid the problems described in:
> https://bugs.openjdk.java.net/browse/JDK-8151460
>
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/8151460/hotspot.00/

Looks good to me.

/Per

>
> Summary:
> Two of the metaspace perf-counter tests fails intermittently when run
> with -Xcomp. One reason this has been more frequent lately is a change
> to one of the tests that removed a System.gc() call. This call seems to
> be more important when running with -Xcomp. Having the System.gc() call
> is needed because the PerfCounters are only updated after a GC. And if
> any class loading/unloading happens after the call we can't do the
> assertions we are doing.
>
> When doing this fix I also realized that one of the tests hadn't changed
> UseCompressedKlassPointers to UseCompressedClassPointers, both the
> command-line and the test-code used the old version so I updated this as
> well.
>
> Testing:
> The updated tests pass in RBT.
>
> Thanks,
> Stefan