1.1 --- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp Tue Feb 04 17:38:01 2020 +0800
1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp Tue Feb 04 18:13:14 2020 +0800
1.3 @@ -148,6 +148,9 @@
1.4 // Used to keep track of limit of sweep for the space
1.5 HeapWord* _sweep_limit;
1.6
1.7 + // Stable value of used().
1.8 + size_t _used_stable;
1.9 +
1.10 // Support for compacting cms
1.11 HeapWord* cross_threshold(HeapWord* start, HeapWord* end);
1.12 HeapWord* forward(oop q, size_t size, CompactPoint* cp, HeapWord* compact_top);
1.13 @@ -343,6 +346,17 @@
1.14 // which overestimates the region by returning the entire
1.15 // committed region (this is safe, but inefficient).
1.16
1.17 + // Returns monotonically increasing stable used space bytes for CMS.
1.18 + // This is required for jstat and other memory monitoring tools
1.19 + // that might otherwise see inconsistent used space values during a garbage
1.20 + // collection, promotion or allocation into compactibleFreeListSpace.
1.21 + // The value returned by this function might be smaller than the
1.22 + // actual value.
1.23 + size_t used_stable() const;
1.24 + // Recalculate and cache the current stable used() value. Only to be called
1.25 + // in places where we can be sure that the result is stable.
1.26 + void recalculate_used_stable();
1.27 +
1.28 // Returns a subregion of the space containing all the objects in
1.29 // the space.
1.30 MemRegion used_region() const {
