Contribution

The specific contributions of this paper are as follows.

• Introduction of a bidirectional object instance layout that groups reference fields sequen-
  tially, enabling simpler and faster garbage collection tracing.
• Introduction of a sparse interface virtual table layout that enables constant time interface method lookup in presence of dynamic loading.
• Improvement of the bimodal field thin lock algorithm[13,26] to eliminate busy-wait, without overhead in the object instance layout.
• Categorization of virtual machine memory
  into separate conceptual areas exhibiting different management needs.