41 private: 42 HeapWord* _start; // address of TLAB 43 HeapWord* _top; // address after last allocation 44 HeapWord* _pf_top; // allocation prefetch watermark 45 HeapWord* _end; // allocation end (excluding alignment_reserve) 46 size_t _desired_size; // desired size (including alignment_reserve) 47 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this 48 size_t _allocated_before_last_gc; // total bytes allocated up until the last gc 49 50 static size_t _max_size; // maximum size of any TLAB 51 static unsigned _target_refills; // expected number of refills between GCs 52 53 unsigned _number_of_refills; 54 unsigned _fast_refill_waste; 55 unsigned _slow_refill_waste; 56 unsigned _gc_waste; 57 unsigned _slow_allocations; 58 59 AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs 60 61 void accumulate_statistics(); 62 void initialize_statistics(); 63 64 void set_start(HeapWord* start) { _start = start; } 65 void set_end(HeapWord* end) { _end = end; } 66 void set_top(HeapWord* top) { _top = top; } 67 void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; } 68 void set_desired_size(size_t desired_size) { _desired_size = desired_size; } 69 void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; } 70 71 size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; } 72 73 static int target_refills() { return _target_refills; } 74 size_t initial_desired_size(); 75 76 size_t remaining() const { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); } 77 78 // Make parsable and release it. 79 void reset(); 80 81 // Resize based on amount of allocation, etc. 82 void resize(); 83 84 void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); } 85 86 void initialize(HeapWord* start, HeapWord* top, HeapWord* end); 87 88 void print_stats(const char* tag); 89 90 Thread* myThread(); 91 92 // statistics 93 94 int number_of_refills() const { return _number_of_refills; } 95 int fast_refill_waste() const { return _fast_refill_waste; } 96 int slow_refill_waste() const { return _slow_refill_waste; } 97 int gc_waste() const { return _gc_waste; } 98 int slow_allocations() const { return _slow_allocations; } 99 100 static GlobalTLABStats* _global_stats; 101 static GlobalTLABStats* global_stats() { return _global_stats; } 102 103 public: 104 ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0) { 105 // do nothing. tlabs must be inited by initialize() calls 106 } 107 108 static const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); } 109 static const size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; } 110 static void set_max_size(size_t max_size) { _max_size = max_size; } 111 112 HeapWord* start() const { return _start; } 113 HeapWord* end() const { return _end; } 114 HeapWord* hard_end() const { return _end + alignment_reserve(); } 115 HeapWord* top() const { return _top; } 116 HeapWord* pf_top() const { return _pf_top; } 117 size_t desired_size() const { return _desired_size; } 118 size_t used() const { return pointer_delta(top(), start()); } 119 size_t used_bytes() const { return pointer_delta(top(), start(), 1); } 120 size_t free() const { return pointer_delta(end(), top()); } 121 // Don't discard tlab if remaining space is larger than this. 122 size_t refill_waste_limit() const { return _refill_waste_limit; } 123 size_t hard_size_bytes() const { return pointer_delta(hard_end(), start(), 1); } 124 bool in_used(HeapWord* addr) const { return addr >= start() && addr < top(); } 125 126 // Allocate size HeapWords. The memory is NOT initialized to zero. 127 inline HeapWord* allocate(size_t size); 128 129 // Reserve space at the end of TLAB 130 static size_t end_reserve() { 131 int reserve_size = typeArrayOopDesc::header_size(T_INT); 132 return MAX2(reserve_size, VM_Version::reserve_for_allocation_prefetch()); 133 } 134 static size_t alignment_reserve() { return align_object_size(end_reserve()); } 135 static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } 136 137 // Return tlab size or remaining space in eden such that the 138 // space is large enough to hold obj_size and necessary fill space. 139 // Otherwise return 0; 140 inline size_t compute_size(size_t obj_size); 141 142 // Record slow allocation 143 inline void record_slow_allocation(size_t obj_size); 144 145 // Initialization at startup 146 static void startup_initialization(); 147 148 // Make an in-use tlab parsable, optionally also retiring it. 149 void make_parsable(bool retire); 150 151 // Retire in-use tlab before allocation of a new tlab 152 void clear_before_allocation(); 153 154 // Accumulate statistics across all tlabs before gc 155 static void accumulate_statistics_before_gc(); 156 157 // Resize tlabs for all threads 158 static void resize_all_tlabs(); 159 160 void fill(HeapWord* start, HeapWord* top, size_t new_size); 161 void initialize(); 162 163 static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } 164 165 // Code generation support 166 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } 167 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); } 168 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); } 169 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); } 170 static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); } 171 static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); } 172 173 static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); } 174 static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); } 175 static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); } 176 177 void verify(); 178 }; 179 180 class GlobalTLABStats: public CHeapObj<mtThread> { 181 private: | 41 private: 42 HeapWord* _start; // address of TLAB 43 HeapWord* _top; // address after last allocation 44 HeapWord* _pf_top; // allocation prefetch watermark 45 HeapWord* _end; // allocation end (excluding alignment_reserve) 46 size_t _desired_size; // desired size (including alignment_reserve) 47 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this 48 size_t _allocated_before_last_gc; // total bytes allocated up until the last gc 49 50 static size_t _max_size; // maximum size of any TLAB 51 static unsigned _target_refills; // expected number of refills between GCs 52 53 unsigned _number_of_refills; 54 unsigned _fast_refill_waste; 55 unsigned _slow_refill_waste; 56 unsigned _gc_waste; 57 unsigned _slow_allocations; 58 59 AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs 60 61 bool _gclab; 62 bool _initialized; 63 64 void set_start(HeapWord* start) { _start = start; } 65 void set_end(HeapWord* end) { _end = end; } 66 void set_top(HeapWord* top) { _top = top; } 67 void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; } 68 void set_desired_size(size_t desired_size) { _desired_size = desired_size; } 69 void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; } 70 71 size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; } 72 73 static int target_refills() { return _target_refills; } 74 size_t initial_desired_size(); 75 76 size_t remaining() const { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); } 77 78 // Make parsable and release it. 79 void reset(); 80 81 void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); } 82 83 void initialize(HeapWord* start, HeapWord* top, HeapWord* end); 84 85 void print_stats(const char* tag); 86 87 Thread* myThread(); 88 89 // statistics 90 91 int number_of_refills() const { return _number_of_refills; } 92 int fast_refill_waste() const { return _fast_refill_waste; } 93 int slow_refill_waste() const { return _slow_refill_waste; } 94 int gc_waste() const { return _gc_waste; } 95 int slow_allocations() const { return _slow_allocations; } 96 97 static GlobalTLABStats* _global_stats; 98 static GlobalTLABStats* global_stats() { return _global_stats; } 99 100 public: 101 ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0), _initialized(false) { 102 // do nothing. tlabs must be inited by initialize() calls 103 } 104 105 bool is_initialized() const { return _initialized; }; 106 107 static const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); } 108 static const size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; } 109 static void set_max_size(size_t max_size) { _max_size = max_size; } 110 111 HeapWord* start() const { return _start; } 112 HeapWord* end() const { return _end; } 113 HeapWord* hard_end() const { return _end + alignment_reserve(); } 114 HeapWord* top() const { return _top; } 115 HeapWord* pf_top() const { return _pf_top; } 116 size_t desired_size() const { return _desired_size; } 117 size_t used() const { return pointer_delta(top(), start()); } 118 size_t used_bytes() const { return pointer_delta(top(), start(), 1); } 119 size_t free() const { return pointer_delta(end(), top()); } 120 // Don't discard tlab if remaining space is larger than this. 121 size_t refill_waste_limit() const { return _refill_waste_limit; } 122 size_t hard_size_bytes() const { return pointer_delta(hard_end(), start(), 1); } 123 bool in_used(HeapWord* addr) const { return addr >= start() && addr < top(); } 124 125 // Allocate size HeapWords. The memory is NOT initialized to zero. 126 inline HeapWord* allocate(size_t size); 127 128 // Reserve space at the end of TLAB 129 static size_t end_reserve() { 130 int reserve_size = typeArrayOopDesc::header_size(T_INT); 131 return MAX2(reserve_size, VM_Version::reserve_for_allocation_prefetch()); 132 } 133 134 // Resize based on amount of allocation, etc. 135 void resize(); 136 137 void accumulate_statistics(); 138 void initialize_statistics(); 139 140 // Rolls back a single allocation of the given size. 141 void rollback(size_t size); 142 143 static size_t alignment_reserve() { return align_object_size(end_reserve()); } 144 static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } 145 146 // Return tlab size or remaining space in eden such that the 147 // space is large enough to hold obj_size and necessary fill space. 148 // Otherwise return 0; 149 inline size_t compute_size(size_t obj_size); 150 151 // Record slow allocation 152 inline void record_slow_allocation(size_t obj_size); 153 154 // Initialization at startup 155 static void startup_initialization(); 156 157 // Make an in-use tlab parsable, optionally also retiring it. 158 void make_parsable(bool retire); 159 160 // Retire in-use tlab before allocation of a new tlab 161 void clear_before_allocation(); 162 163 // Accumulate statistics across all tlabs before gc 164 static void accumulate_statistics_before_gc(); 165 166 // Resize tlabs for all threads 167 static void resize_all_tlabs(); 168 169 void fill(HeapWord* start, HeapWord* top, size_t new_size); 170 void initialize(bool gclab); 171 172 static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } 173 174 // Code generation support 175 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } 176 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); } 177 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); } 178 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); } 179 static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); } 180 static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); } 181 182 static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); } 183 static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); } 184 static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); } 185 186 void verify(); 187 }; 188 189 class GlobalTLABStats: public CHeapObj<mtThread> { 190 private: |