The Machine Representation

The Machine representation shows functions from the JVM software itself, rather than from the application being interpreted by the JVM software. It also shows all compiled and native methods. The machine representation looks the same as that of applications written in traditional languages. The call stack shows JVM frames, native frames, and compiled-method frames. Some of the JVM frames represent transition code between interpreted Java, compiled Java, and native code.

Source from compiled methods are shown against the Java source; the data represents the specific instance of the compiled-method selected. Disassembly for compiled methods show the generated machine assembler code, not the Java bytecode. Caller-callee relationships show all overhead frames, and all frames representing the transitions between interpreted, compiled, and native methods.

The Timeline in the machine representation shows bars for all threads, LWPs, or CPUs, and the call stack in each is the machine-representation call stack.

In the machine representation, thread synchronization devolves into calls to _lwp_mutex_lock. No synchronization data is shown, since these calls are not traced.