45 class ThreadLocalAllocBuffer: public CHeapObj<mtThread> {
46 friend class VMStructs;
47 friend class JVMCIVMStructs;
48 private:
49 HeapWord* _start; // address of TLAB
50 HeapWord* _top; // address after last allocation
51 HeapWord* _pf_top; // allocation prefetch watermark
52 HeapWord* _end; // allocation end (can be the sampling end point or _allocation_end)
53 HeapWord* _allocation_end; // end for allocations (actual TLAB end, excluding alignment_reserve)
54
55 size_t _desired_size; // desired size (including alignment_reserve)
56 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this
57 size_t _allocated_before_last_gc; // total bytes allocated up until the last gc
58 size_t _bytes_since_last_sample_point; // bytes since last sample point.
59
60 static size_t _max_size; // maximum size of any TLAB
61 static int _reserve_for_allocation_prefetch; // Reserve at the end of the TLAB
62 static unsigned _target_refills; // expected number of refills between GCs
63
64 unsigned _number_of_refills;
65 unsigned _fast_refill_waste;
66 unsigned _slow_refill_waste;
67 unsigned _gc_waste;
68 unsigned _slow_allocations;
69 size_t _allocated_size;
70
71 AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs
72
73 void reset_statistics();
74
75 void set_start(HeapWord* start) { _start = start; }
76 void set_end(HeapWord* end) { _end = end; }
77 void set_allocation_end(HeapWord* ptr) { _allocation_end = ptr; }
78 void set_top(HeapWord* top) { _top = top; }
79 void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; }
80 void set_desired_size(size_t desired_size) { _desired_size = desired_size; }
81 void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; }
82
83 size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; }
84
85 static int target_refills() { return _target_refills; }
86 size_t initial_desired_size();
87
88 size_t remaining();
89
90 // Make parsable and release it.
91 void reset();
92
93 void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); }
94
95 void initialize(HeapWord* start, HeapWord* top, HeapWord* end);
96
97 void insert_filler();
98
99 void accumulate_and_reset_statistics(ThreadLocalAllocStats* stats);
100
101 void print_stats(const char* tag);
102
103 Thread* thread();
104
105 // statistics
106
107 int number_of_refills() const { return _number_of_refills; }
108 int fast_refill_waste() const { return _fast_refill_waste; }
109 int slow_refill_waste() const { return _slow_refill_waste; }
110 int gc_waste() const { return _gc_waste; }
111 int slow_allocations() const { return _slow_allocations; }
112
113 public:
114 ThreadLocalAllocBuffer() : _allocated_before_last_gc(0), _allocation_fraction(TLABAllocationWeight) {
115 // do nothing. tlabs must be inited by initialize() calls
116 }
117
118 static size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); }
119 static size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; }
120 static size_t max_size_in_bytes() { return max_size() * BytesPerWord; }
121 static void set_max_size(size_t max_size) { _max_size = max_size; }
122
123 HeapWord* start() const { return _start; }
124 HeapWord* end() const { return _end; }
125 HeapWord* top() const { return _top; }
126 HeapWord* hard_end();
127 HeapWord* pf_top() const { return _pf_top; }
128 size_t desired_size() const { return _desired_size; }
129 size_t used() const { return pointer_delta(top(), start()); }
130 size_t used_bytes() const { return pointer_delta(top(), start(), 1); }
131 size_t free() const { return pointer_delta(end(), top()); }
132 // Don't discard tlab if remaining space is larger than this.
181 f(&_pf_top);
182 f(&_end);
183 f(&_allocation_end);
184 }
185
186 // Code generation support
187 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); }
188 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end); }
189 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top); }
190 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top); }
191 };
192
193 class ThreadLocalAllocStats : public StackObj {
194 private:
195 static PerfVariable* _perf_allocating_threads;
196 static PerfVariable* _perf_total_refills;
197 static PerfVariable* _perf_max_refills;
198 static PerfVariable* _perf_total_allocations;
199 static PerfVariable* _perf_total_gc_waste;
200 static PerfVariable* _perf_max_gc_waste;
201 static PerfVariable* _perf_total_slow_refill_waste;
202 static PerfVariable* _perf_max_slow_refill_waste;
203 static PerfVariable* _perf_total_fast_refill_waste;
204 static PerfVariable* _perf_max_fast_refill_waste;
205 static PerfVariable* _perf_total_slow_allocations;
206 static PerfVariable* _perf_max_slow_allocations;
207
208 static AdaptiveWeightedAverage _allocating_threads_avg;
209
210 unsigned int _allocating_threads;
211 unsigned int _total_refills;
212 unsigned int _max_refills;
213 size_t _total_allocations;
214 size_t _total_gc_waste;
215 size_t _max_gc_waste;
216 size_t _total_fast_refill_waste;
217 size_t _max_fast_refill_waste;
218 size_t _total_slow_refill_waste;
219 size_t _max_slow_refill_waste;
220 unsigned int _total_slow_allocations;
221 unsigned int _max_slow_allocations;
222
223 public:
224 static void initialize();
225 static unsigned int allocating_threads_avg();
226
227 ThreadLocalAllocStats();
228
229 void update_fast_allocations(unsigned int refills,
230 size_t allocations,
231 size_t gc_waste,
232 size_t fast_refill_waste,
233 size_t slow_refill_waste);
234 void update_slow_allocations(unsigned int allocations);
235 void update(const ThreadLocalAllocStats& other);
236
237 void reset();
238 void publish();
239 };
240
241 #endif // SHARE_GC_SHARED_THREADLOCALALLOCBUFFER_HPP
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45 class ThreadLocalAllocBuffer: public CHeapObj<mtThread> {
46 friend class VMStructs;
47 friend class JVMCIVMStructs;
48 private:
49 HeapWord* _start; // address of TLAB
50 HeapWord* _top; // address after last allocation
51 HeapWord* _pf_top; // allocation prefetch watermark
52 HeapWord* _end; // allocation end (can be the sampling end point or _allocation_end)
53 HeapWord* _allocation_end; // end for allocations (actual TLAB end, excluding alignment_reserve)
54
55 size_t _desired_size; // desired size (including alignment_reserve)
56 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this
57 size_t _allocated_before_last_gc; // total bytes allocated up until the last gc
58 size_t _bytes_since_last_sample_point; // bytes since last sample point.
59
60 static size_t _max_size; // maximum size of any TLAB
61 static int _reserve_for_allocation_prefetch; // Reserve at the end of the TLAB
62 static unsigned _target_refills; // expected number of refills between GCs
63
64 unsigned _number_of_refills;
65 unsigned _refill_waste;
66 unsigned _gc_waste;
67 unsigned _slow_allocations;
68 size_t _allocated_size;
69
70 AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs
71
72 void reset_statistics();
73
74 void set_start(HeapWord* start) { _start = start; }
75 void set_end(HeapWord* end) { _end = end; }
76 void set_allocation_end(HeapWord* ptr) { _allocation_end = ptr; }
77 void set_top(HeapWord* top) { _top = top; }
78 void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; }
79 void set_desired_size(size_t desired_size) { _desired_size = desired_size; }
80 void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; }
81
82 size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; }
83
84 static int target_refills() { return _target_refills; }
85 size_t initial_desired_size();
86
87 size_t remaining();
88
89 // Make parsable and release it.
90 void reset();
91
92 void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); }
93
94 void initialize(HeapWord* start, HeapWord* top, HeapWord* end);
95
96 void insert_filler();
97
98 void accumulate_and_reset_statistics(ThreadLocalAllocStats* stats);
99
100 void print_stats(const char* tag);
101
102 Thread* thread();
103 public:
104 ThreadLocalAllocBuffer() : _allocated_before_last_gc(0), _allocation_fraction(TLABAllocationWeight) {
105 // do nothing. tlabs must be inited by initialize() calls
106 }
107
108 static size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); }
109 static size_t max_size() { assert(_max_size != 0, "max_size not set up"); return _max_size; }
110 static size_t max_size_in_bytes() { return max_size() * BytesPerWord; }
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* top() const { return _top; }
116 HeapWord* hard_end();
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.
171 f(&_pf_top);
172 f(&_end);
173 f(&_allocation_end);
174 }
175
176 // Code generation support
177 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); }
178 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end); }
179 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top); }
180 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top); }
181 };
182
183 class ThreadLocalAllocStats : public StackObj {
184 private:
185 static PerfVariable* _perf_allocating_threads;
186 static PerfVariable* _perf_total_refills;
187 static PerfVariable* _perf_max_refills;
188 static PerfVariable* _perf_total_allocations;
189 static PerfVariable* _perf_total_gc_waste;
190 static PerfVariable* _perf_max_gc_waste;
191 static PerfVariable* _perf_total_refill_waste;
192 static PerfVariable* _perf_max_refill_waste;
193 static PerfVariable* _perf_total_slow_allocations;
194 static PerfVariable* _perf_max_slow_allocations;
195
196 static AdaptiveWeightedAverage _allocating_threads_avg;
197
198 unsigned int _allocating_threads;
199 unsigned int _total_refills;
200 unsigned int _max_refills;
201 size_t _total_allocations;
202 size_t _total_gc_waste;
203 size_t _max_gc_waste;
204 size_t _total_refill_waste;
205 size_t _max_refill_waste;
206 unsigned int _total_slow_allocations;
207 unsigned int _max_slow_allocations;
208
209 public:
210 static void initialize();
211 static unsigned int allocating_threads_avg();
212
213 ThreadLocalAllocStats();
214
215 void update_fast_allocations(unsigned int refills,
216 size_t allocations,
217 size_t gc_waste,
218 size_t refill_waste);
219 void update_slow_allocations(unsigned int allocations);
220 void update(const ThreadLocalAllocStats& other);
221
222 void reset();
223 void publish();
224 };
225
226 #endif // SHARE_GC_SHARED_THREADLOCALALLOCBUFFER_HPP
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