Method for Implementing User Space Up-Calls on Java Virtual Machine Before/After Garbage Collection

Disclosed are apparatus and methods for reporting garbage collection operations. A virtual machine that is executable on a computing device can receive a request to be informed prior to execution of garbage collection software on the computing device via a prior up-call. The virtual machine can receive a request to be informed upon completion of execution of the garbage collection software on the computing device via a post up-call. Prior to the execution of the garbage collection software, the virtual machine can initiate execution of the prior up-call to indicate the garbage collection software is to be executed. After the garbage collection software has completed execution, the virtual machine can initiate execution of the post up-call to indicate the garbage collection software has completed execution.