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

[Jon Masamitsu]

Vladimir,

http://cr.openjdk.java.net/~vlivanov/8151623/webrev.00/src/share/vm/memory/metachunk.cpp.frames.html

Did you consider adding the "wordValue" parameter

101 static void overwrite_chunk_payload(Metachunk* chunk, juint wordValue) {

to the original Metachunk::mangle() so that it becomes

101 void Metachunk::mangle(juint wordValue) { ... 106 
Copy::fill_to_words(start, size, wordValue);


Jon

On 03/10/2016 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