Do you have any good link/books for learning about JVM? I found that there are tons of beginner java, but nothing on JVM. I've only found by Scott Oaks Java P

Do you have any good link/books for learning about JVM? I found that there are tons of beginner java, but nothing on JVM. I've only found by Scott Oaks Java Performance, which gives some interesting knowledge about JVM but it's a secondary focus.