123 assert(new_word_sz > AlignmentReserve, "Too small");
124 _word_sz = new_word_sz;
125
126 _bottom = buf;
127 _top = _bottom;
128 _hard_end = _bottom + word_sz();
129 _end = _hard_end - AlignmentReserve;
130 assert(_end >= _top, "Negative buffer");
131 // In support of ergonomic sizing
132 _allocated += word_sz();
133 }
134
135 // Flush allocation statistics into the given PLABStats supporting ergonomic
136 // sizing of PLAB's and retire the current buffer. To be called at the end of
137 // GC.
138 void flush_and_retire_stats(PLABStats* stats);
139
140 // Fills in the unallocated portion of the buffer with a garbage object and updates
141 // statistics. To be called during GC.
142 void retire();
143 };
144
145 // PLAB book-keeping.
146 class PLABStats : public CHeapObj<mtGC> {
147 protected:
148 const char* _description; // Identifying string.
149
150 size_t _allocated; // Total allocated
151 size_t _wasted; // of which wasted (internal fragmentation)
152 size_t _undo_wasted; // of which wasted on undo (is not used for calculation of PLAB size)
153 size_t _unused; // Unused in last buffer
154 size_t _default_plab_sz;
155 size_t _desired_net_plab_sz;// Output of filter (below), suitably trimmed and quantized
156 AdaptiveWeightedAverage
157 _filter; // Integrator with decay
158
159 virtual void reset() {
160 _allocated = 0;
161 _wasted = 0;
162 _undo_wasted = 0;
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123 assert(new_word_sz > AlignmentReserve, "Too small");
124 _word_sz = new_word_sz;
125
126 _bottom = buf;
127 _top = _bottom;
128 _hard_end = _bottom + word_sz();
129 _end = _hard_end - AlignmentReserve;
130 assert(_end >= _top, "Negative buffer");
131 // In support of ergonomic sizing
132 _allocated += word_sz();
133 }
134
135 // Flush allocation statistics into the given PLABStats supporting ergonomic
136 // sizing of PLAB's and retire the current buffer. To be called at the end of
137 // GC.
138 void flush_and_retire_stats(PLABStats* stats);
139
140 // Fills in the unallocated portion of the buffer with a garbage object and updates
141 // statistics. To be called during GC.
142 void retire();
143
144 HeapWord* top() {
145 return _top;
146 }
147 };
148
149 // PLAB book-keeping.
150 class PLABStats : public CHeapObj<mtGC> {
151 protected:
152 const char* _description; // Identifying string.
153
154 size_t _allocated; // Total allocated
155 size_t _wasted; // of which wasted (internal fragmentation)
156 size_t _undo_wasted; // of which wasted on undo (is not used for calculation of PLAB size)
157 size_t _unused; // Unused in last buffer
158 size_t _default_plab_sz;
159 size_t _desired_net_plab_sz;// Output of filter (below), suitably trimmed and quantized
160 AdaptiveWeightedAverage
161 _filter; // Integrator with decay
162
163 virtual void reset() {
164 _allocated = 0;
165 _wasted = 0;
166 _undo_wasted = 0;
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