1.1 --- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp Tue Feb 04 17:38:01 2020 +0800
1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp Tue Feb 04 18:13:14 2020 +0800
1.3 @@ -161,6 +161,8 @@
1.4 }
1.5 _dictionary->set_par_lock(&_parDictionaryAllocLock);
1.6 }
1.7 +
1.8 + _used_stable = 0;
1.9 }
1.10
1.11 // Like CompactibleSpace forward() but always calls cross_threshold() to
1.12 @@ -377,6 +379,14 @@
1.13 return capacity() - free();
1.14 }
1.15
1.16 +size_t CompactibleFreeListSpace::used_stable() const {
1.17 + return _used_stable;
1.18 +}
1.19 +
1.20 +void CompactibleFreeListSpace::recalculate_used_stable() {
1.21 + _used_stable = used();
1.22 +}
1.23 +
1.24 size_t CompactibleFreeListSpace::free() const {
1.25 // "MT-safe, but not MT-precise"(TM), if you will: i.e.
1.26 // if you do this while the structures are in flux you
1.27 @@ -1218,6 +1228,13 @@
1.28 debug_only(fc->mangleAllocated(size));
1.29 }
1.30
1.31 + // During GC we do not need to recalculate the stable used value for
1.32 + // every allocation in old gen. It is done once at the end of GC instead
1.33 + // for performance reasons.
1.34 + if (!Universe::heap()->is_gc_active()) {
1.35 + recalculate_used_stable();
1.36 + }
1.37 +
1.38 return res;
1.39 }
1.40
