Huge sun.nio.fs object churn on EAP7

Issue

• After starting JBoss EAP, without any user using the system, the memory shows a saw-tooth pattern, going from 1G to 10G, then back to 1G, then to 10G, etc.
• It doesn't seem like a memory leak, it just uses a lot of memory without any user usage.
• Garbage collection analysis does not show any issues. Objects apparently die very young and are collected very cheaply.
• Heap dump analysis shows huge numbers of sun.nio.fs.UnixPath and sun.nio.fs.UnixFileAttributes$UnixAsBasicFileAttributes and significant heap space in unreachable objects that will be reclaimed during the next garbage collection.
• Heap dump analysis does not show any live sun.nio.fs.UnixPath and sun.nio.fs.UnixFileAttributes$UnixAsBasicFileAttributes objects, but sun.nio.fs retention related to the xnio-file-watcher thread.