src/hotspot/share/gc/g1/g1RemSet.hpp

*** 102,111 ****
--- 102,114 ----
    void prepare_for_scan_heap_roots();
    // Cleans the card table from temporary duplicate detection information.
    void cleanup_after_scan_heap_roots();
    // Prepares the given region for heap root scanning.
    void prepare_for_scan_heap_roots(uint region_idx);
+   // Creates a snapshot of the current _top values at the start of collection to
+   // filter out card marks that we do not want to scan.
+   void prepare_region_for_scan(HeapRegion* region);
  
    // Do work for regions in the current increment of the collection set, scanning
    // non-card based (heap) roots.
    void scan_collection_set_regions(G1ParScanThreadState* pss,
                                     uint worker_id,