[9] RFR (XS): 8151623: Zap freed Metaspace chunks in non-product binaries

[Dean Long]

This looks good.  I was experimenting with a similar change.  The 
comment nearby saying
"Do not mangle freed Metachunks" made me wonder if it was safe. Could 
you update the
comment if this is indeed safe?  Also, is there a Zap<something> flag we 
can use to turn
this off and on?

dl

On 3/10/2016 10:55 AM, Vladimir Ivanov wrote:
> http://cr.openjdk.java.net/~vlivanov/8151623/webrev.00
> https://bugs.openjdk.java.net/browse/JDK-8151623
>
> Zap freed Metaspace chunks in non-product binaries to catch stray 
> accesses to unloaded classes.
>
> Testing: JPRT, RBT (in progress): hotspot/test:hotspot_all, 
> jdk/test:tier1 & tier2, vm.parallel_class_loading.testlist, 
> vm.gc.testlist, BigApps w/ fastdebug binaries.
>
> Thanks!
>
> Best regards,
> Vladimir Ivanov