src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp

rev 5920 : 8035406: Improve data structure for Code Cache remembered sets
Summary: Change the code cache remembered sets data structure from a GrowableArray to a chunked list of nmethods. This makes the data structure more amenable to parallelization, and decreases freeing time.
Reviewed-by:
rev 5921 : 8027295: Free CSet takes ~50% of young pause time
Summary: Improve fast card cache iteration and avoid taking locks when freeing the collection set.
Reviewed-by:

@@ -837,14 +837,16 @@
   // adding it to the free list that's passed as a parameter (this is
   // usually a local list which will be appended to the master free
   // list later). The used bytes of freed regions are accumulated in
   // pre_used. If par is true, the region's RSet will not be freed
   // up. The assumption is that this will be done later.
+  // The locked parameter indicates if the caller has already taken
+  // care of proper synchronization. This may allow some optimizations.
   void free_region(HeapRegion* hr,
                    size_t* pre_used,
                    FreeRegionList* free_list,
-                   bool par);
+                   bool par, bool locked = false);
 
   // Frees a humongous region by collapsing it into individual regions
   // and calling free_region() for each of them. The freed regions
   // will be added to the free list that's passed as a parameter (this
   // is usually a local list which will be appended to the master free