gc roots tracing

GC roots tracing is a technique used by garbage collectors to identify objects that are still in use and should not be reclaimed. The process starts with a set of known roots, such as the stack and static variables, and follows references to other objects to build a graph of all reachable objects. Any objects that are not found in this graph are considered unreachable and can be safely reclaimed.

The roots tracing process is typically performed periodically by the garbage collector to reclaim memory that is no longer needed by the application. It is an important part of managing memory in languages like Java and C#, which use automatic memory management through garbage collection.