src/hotspot/share/gc/shared/threadLocalAllocBuffer.hpp

rev 48920 : [backport] Use PLAB for evacuations instead of TLAB

*** 59,70 ****
    unsigned  _gc_waste;
    unsigned  _slow_allocations;
  
    AdaptiveWeightedAverage _allocation_fraction;  // fraction of eden allocated in tlabs
  
!   bool _gclab;
!   bool _initialized;
  
    void set_start(HeapWord* start)                { _start = start; }
    void set_end(HeapWord* end)                    { _end = end; }
    void set_top(HeapWord* top)                    { _top = top; }
    void set_pf_top(HeapWord* pf_top)              { _pf_top = pf_top; }
--- 59,70 ----
    unsigned  _gc_waste;
    unsigned  _slow_allocations;
  
    AdaptiveWeightedAverage _allocation_fraction;  // fraction of eden allocated in tlabs
  
!   void accumulate_statistics();
!   void initialize_statistics();
  
    void set_start(HeapWord* start)                { _start = start; }
    void set_end(HeapWord* end)                    { _end = end; }
    void set_top(HeapWord* top)                    { _top = top; }
    void set_pf_top(HeapWord* pf_top)              { _pf_top = pf_top; }
*** 79,88 ****
--- 79,91 ----
    size_t remaining() const                       { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); }
  
    // Make parsable and release it.
    void reset();
  
+   // Resize based on amount of allocation, etc.
+   void resize();
+ 
    void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); }
  
    void initialize(HeapWord* start, HeapWord* top, HeapWord* end);
  
    void print_stats(const char* tag);
*** 99,114 ****
  
    static GlobalTLABStats* _global_stats;
    static GlobalTLABStats* global_stats() { return _global_stats; }
  
  public:
!   ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0), _initialized(false) {
      // do nothing.  tlabs must be inited by initialize() calls
    }
  
-   bool is_initialized() const { return _initialized; };
- 
    static size_t min_size()                       { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); }
    static size_t max_size()                       { assert(_max_size != 0, "max_size not set up"); return _max_size; }
    static size_t max_size_in_bytes()              { return max_size() * BytesPerWord; }
    static void set_max_size(size_t max_size)      { _max_size = max_size; }
  
--- 102,115 ----
  
    static GlobalTLABStats* _global_stats;
    static GlobalTLABStats* global_stats() { return _global_stats; }
  
  public:
!   ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0) {
      // do nothing.  tlabs must be inited by initialize() calls
    }
  
    static size_t min_size()                       { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); }
    static size_t max_size()                       { assert(_max_size != 0, "max_size not set up"); return _max_size; }
    static size_t max_size_in_bytes()              { return max_size() * BytesPerWord; }
    static void set_max_size(size_t max_size)      { _max_size = max_size; }
  
*** 125,145 ****
    size_t refill_waste_limit() const              { return _refill_waste_limit; }
  
    // Allocate size HeapWords. The memory is NOT initialized to zero.
    inline HeapWord* allocate(size_t size);
  
-   // Resize based on amount of allocation, etc.
-   void resize();
- 
-   void accumulate_statistics();
-   void initialize_statistics();
- 
-   // Rolls back a single allocation of the given size.
-   void rollback(size_t size);
- 
    // Reserve space at the end of TLAB
!   static size_t end_reserve();
    static size_t alignment_reserve()              { return align_object_size(end_reserve()); }
    static size_t alignment_reserve_in_bytes()     { return alignment_reserve() * HeapWordSize; }
  
    // Return tlab size or remaining space in eden such that the
    // space is large enough to hold obj_size and necessary fill space.
--- 126,140 ----
    size_t refill_waste_limit() const              { return _refill_waste_limit; }
  
    // Allocate size HeapWords. The memory is NOT initialized to zero.
    inline HeapWord* allocate(size_t size);
  
    // Reserve space at the end of TLAB
!   static size_t end_reserve() {
!     int reserve_size = typeArrayOopDesc::header_size(T_INT);
!     return MAX2(reserve_size, _reserve_for_allocation_prefetch);
!   }
    static size_t alignment_reserve()              { return align_object_size(end_reserve()); }
    static size_t alignment_reserve_in_bytes()     { return alignment_reserve() * HeapWordSize; }
  
    // Return tlab size or remaining space in eden such that the
    // space is large enough to hold obj_size and necessary fill space.
*** 163,173 ****
  
    // Resize tlabs for all threads
    static void resize_all_tlabs();
  
    void fill(HeapWord* start, HeapWord* top, size_t new_size);
!   void initialize(bool gclab);
  
    static size_t refill_waste_limit_increment()   { return TLABWasteIncrement; }
  
    // Code generation support
    static ByteSize start_offset()                 { return byte_offset_of(ThreadLocalAllocBuffer, _start); }
--- 158,168 ----
  
    // Resize tlabs for all threads
    static void resize_all_tlabs();
  
    void fill(HeapWord* start, HeapWord* top, size_t new_size);
!   void initialize();
  
    static size_t refill_waste_limit_increment()   { return TLABWasteIncrement; }
  
    // Code generation support
    static ByteSize start_offset()                 { return byte_offset_of(ThreadLocalAllocBuffer, _start); }