US Patent 11687449 Concurrent marking garbage collection

A computer-implemented method is provided for reducing Compare And Swap (CAS) operations in a concurrent marking Garbage Collection (GC) process that operates on objects corresponding to a bit map of multiple blocks. The method includes finding, from among the objects, live objects that belong to a same block in the bit map from among the multiple blocks when traversing object trees of the objects for GC marking. The method further includes loading a latest value of the same block from the bitmap, updating the latest value by setting corresponding marking bits in the bit map, and updating the same block in the bit map with a single CAS operation.