RFR (XS): 8151623: Zap freed Metaspace chunks in non-product binaries
vladimir.x.ivanov at oracle.com
Thu Mar 10 21:15:26 UTC 2016
On 3/10/16 10:43 PM, Dean Long wrote:
> 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
Good catch, fixed. Unless there's something useful stored after the
header in a free chunk, it should be safe.
> comment if this is indeed safe? Also, is there a Zap<something> flag we
> can use to turn
> this off and on?
Do you suggest a non-product or a diagnostic flag (to be able to turn it
on in product binaries)?
> On 3/10/2016 10:55 AM, Vladimir Ivanov wrote:
>> 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.
>> Best regards,
>> Vladimir Ivanov
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