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