src/share/vm/gc/shared/plab.hpp

rev 8852 : [mq]: 8133470-fix-plab-inline
rev 8853 : imported patch mikael-erik-suggestions
rev 8854 : imported patch 8073013-add-detailed-information-about-plab-memory-usage
rev 8857 : imported patch mikael-comments
rev 8866 : imported patch 8067339-PLAB-reallocation-might-result-in-failure-to-allocate
rev 8867 : [mq]: bengt-refactoring

*** 72,81 ****
--- 72,83 ----
    // Initializes the buffer to be empty, but with the given "word_sz".
    // Must get initialized with "set_buf" for an allocation to succeed.
    PLAB(size_t word_sz);
    virtual ~PLAB() {}
  
+   static size_t size_required_for_allocation(size_t word_size) { return word_size + AlignmentReserve; }
+ 
    // Minimum PLAB size.
    static size_t min_size();
    // Maximum PLAB size.
    static size_t max_size();
  
*** 105,121 ****
    size_t word_sz() { return _word_sz; }
  
    size_t waste() { return _wasted; }
    size_t undo_waste() { return _undo_wasted; }
  
-   // Should only be done if we are about to reset with a new buffer of the
-   // given size.
-   void set_word_size(size_t new_word_sz) {
-     assert(new_word_sz > AlignmentReserve, "Too small");
-     _word_sz = new_word_sz;
-   }
- 
    // The number of words of unallocated space remaining in the buffer.
    size_t words_remaining() {
      assert(_end >= _top, "Negative buffer");
      return pointer_delta(_end, _top, HeapWordSize);
    }
--- 107,116 ----
*** 123,133 ****
    bool contains(void* addr) {
      return (void*)_bottom <= addr && addr < (void*)_hard_end;
    }
  
    // Sets the space of the buffer to be [buf, space+word_sz()).
!   virtual void set_buf(HeapWord* buf) {
      _bottom   = buf;
      _top      = _bottom;
      _hard_end = _bottom + word_sz();
      _end      = _hard_end - AlignmentReserve;
      assert(_end >= _top, "Negative buffer");
--- 118,131 ----
    bool contains(void* addr) {
      return (void*)_bottom <= addr && addr < (void*)_hard_end;
    }
  
    // Sets the space of the buffer to be [buf, space+word_sz()).
!   virtual void set_buf(HeapWord* buf, size_t new_word_sz) {
!     assert(new_word_sz > AlignmentReserve, "Too small");
!     _word_sz = new_word_sz;
! 
      _bottom   = buf;
      _top      = _bottom;
      _hard_end = _bottom + word_sz();
      _end      = _hard_end - AlignmentReserve;
      assert(_end >= _top, "Negative buffer");