IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > Balanced Garbage Collection policy

Region age

Age is tracked for each region in the Java™ heap, with 24 possible generations.

Like the Generational Concurrent Garbage Collector, the Balanced Garbage Collector tracks the age of objects in the Java heap. The Generational Concurrent Garbage Collector tracks object ages for each individual object, assigning two generations, "new" and "tenure". However, the Balanced Garbage Collector tracks object ages for each region, with 24 possible generations. An age 0 region, known as the eden space, contains the newest objects allocated. The highest age region represents a maximum age where all long-lived objects eventually reside. A Partial Garbage Collection (PGC) must collect age 0 regions, but can add any other regions to the collection set, regardless of age.

This diagram shows a region-based Java heap with ages and unused regions:

Note: There is no requirement that similarly aged regions are contiguous.

Parent: Balanced Garbage Collection policy

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