RFR 8211331: [Event Request] Events to track Unsafe memory allocations

[gerard ziemski]

Hi all,

Please review this feature, which adds JFR event tracking for Unsafe 
memory allocations/deallocations.

I chose to use malloc_size() on Mac, malloc_usable_size() on Linux and 
_msize() on Windows to track pointer size, which allowed me to track the 
sizes during deallocations (as well as the actual sizes that the OS 
allocated). Other platforms have that feature disabled, but still track 
the (client) allocation sizes.

Bug: https://bugs.openjdk.java.net/browse/JDK-8211331
Webrev: http://cr.openjdk.java.net/~gziemski/8211331_rev1
Testing: Mach5 tier1 passes, Mach5 tier1,2,3,4,5,6,7 in progress…


cheers