src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp

rev 7557 : 8060025: Object copy time regressions after JDK-8031323 and JDK-8057536
Summary: Evaluate and improve object copy time by micro-optimizations and splitting out slow and fast paths aggressively.
Reviewed-by:
Contributed-by: Tony Printezis <tprintezis@twitter.com>, Thomas Schatzl <thomas.schatzl@oracle.com>
rev 7559 : imported patch mikael-refactor-cset-state
rev 7560 : imported patch kim-review

*** 879,910 ****
    ageTable _survivors_age_table;
  
  public:
    uint tenuring_threshold() const { return _tenuring_threshold; }
  
-   inline GCAllocPurpose
-     evacuation_destination(HeapRegion* src_region, uint age, size_t word_sz) {
-       if (age < _tenuring_threshold && src_region->is_young()) {
-         return GCAllocForSurvived;
-       } else {
-         return GCAllocForTenured;
-       }
-   }
- 
-   inline bool track_object_age(GCAllocPurpose purpose) {
-     return purpose == GCAllocForSurvived;
-   }
- 
    static const uint REGIONS_UNLIMITED = (uint) -1;
  
!   uint max_regions(int purpose);
! 
!   // The limit on regions for a particular purpose is reached.
!   void note_alloc_region_limit_reached(int purpose) {
!     if (purpose == GCAllocForSurvived) {
!       _tenuring_threshold = 0;
      }
    }
  
    void note_start_adding_survivor_regions() {
      _survivor_surv_rate_group->start_adding_regions();
    }
--- 879,902 ----
    ageTable _survivors_age_table;
  
  public:
    uint tenuring_threshold() const { return _tenuring_threshold; }
  
    static const uint REGIONS_UNLIMITED = (uint) -1;
  
!   uint max_regions(InCSetState dest) {
!     switch (dest.value()) {
!       case InCSetState::Young:
!         return _max_survivor_regions;
!       case InCSetState::Old:
!         return REGIONS_UNLIMITED;
!       default:
!         assert(false, err_msg("Unknown dest state: " CSETSTATE_FORMAT, dest.value()));
!         break;
      }
+     // keep some compilers happy
+     return 0;
    }
  
    void note_start_adding_survivor_regions() {
      _survivor_surv_rate_group->start_adding_regions();
    }