running NMT:

java -XX:NativeMemoryTracking=detail <java2demo or something>
... wait ...
jcmd <pid> VM.native_memory detail >out

In the detailed output, many of the stacktraces start with the function that creates the stack trace. It should start with the second thing in the stack trace so that we get one more frame at the bottom of the list (or top of the stack itself).

[0xf6c6e7ff] NativeCallStack::NativeCallStack(int, bool)+0x5f
[0xf66cb395] ChunkPool::allocate(unsigned int, AllocFailStrategy::AllocFailEnum)+0x125
[0xf66ca15d] Arena::Arena(MemoryType, unsigned int)+0x14d
[0xf6c0377d] Matcher::Matcher()+0x4d
                             (malloc=20KB #2)
[] we want one more frame here and not NativeCallStack!!