Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.hpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
| author | mgerdin |
|---|---|
| date | Thu, 09 Oct 2014 15:42:23 +0200 |
| parents | cfd4aac53239 |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP |
| 26 #define SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP | |
| 27 | |
| 28 #include "gc_implementation/shared/gcUtil.hpp" | |
| 29 #include "oops/typeArrayOop.hpp" | |
| 30 #include "runtime/perfData.hpp" | |
| 31 | |
| 0 | 32 class GlobalTLABStats; |
| 33 | |
| 34 // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by | |
| 35 // the threads for allocation. | |
| 36 // It is thread-private at any time, but maybe multiplexed over | |
| 37 // time across multiple threads. The park()/unpark() pair is | |
| 6818 | 38 // used to make it available for such multiplexing. |
| 6197 | 39 class ThreadLocalAllocBuffer: public CHeapObj<mtThread> { |
| 0 | 40 friend class VMStructs; |
| 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 | |
| 17727 | 48 size_t _allocated_before_last_gc; // total bytes allocated up until the last gc |
| 0 | 49 |
| 17727 | 50 static size_t _max_size; // maximum size of any TLAB |
| 0 | 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: | |
| 17727 | 104 ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight), _allocated_before_last_gc(0) { |
| 0 | 105 // do nothing. tlabs must be inited by initialize() calls |
| 106 } | |
| 107 | |
| 21811 | 108 static const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize) + alignment_reserve(); } |
| 17727 | 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; } | |
| 0 | 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; } | |
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118 size_t used() const { return pointer_delta(top(), start()); } |
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119 size_t used_bytes() const { return pointer_delta(top(), start(), 1); } |
| 0 | 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 | |
| 124 // Allocate size HeapWords. The memory is NOT initialized to zero. | |
| 125 inline HeapWord* allocate(size_t size); | |
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126 |
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127 // Reserve space at the end of TLAB |
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128 static size_t end_reserve() { |
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129 int reserve_size = typeArrayOopDesc::header_size(T_INT); |
| 3854 | 130 return MAX2(reserve_size, VM_Version::reserve_for_allocation_prefetch()); |
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131 } |
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132 static size_t alignment_reserve() { return align_object_size(end_reserve()); } |
| 0 | 133 static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } |
| 134 | |
| 135 // Return tlab size or remaining space in eden such that the | |
| 136 // space is large enough to hold obj_size and necessary fill space. | |
| 137 // Otherwise return 0; | |
| 138 inline size_t compute_size(size_t obj_size); | |
| 139 | |
| 140 // Record slow allocation | |
| 141 inline void record_slow_allocation(size_t obj_size); | |
| 142 | |
| 143 // Initialization at startup | |
| 144 static void startup_initialization(); | |
| 145 | |
| 146 // Make an in-use tlab parsable, optionally also retiring it. | |
| 147 void make_parsable(bool retire); | |
| 148 | |
| 149 // Retire in-use tlab before allocation of a new tlab | |
| 150 void clear_before_allocation(); | |
| 151 | |
| 152 // Accumulate statistics across all tlabs before gc | |
| 153 static void accumulate_statistics_before_gc(); | |
| 154 | |
| 155 // Resize tlabs for all threads | |
| 156 static void resize_all_tlabs(); | |
| 157 | |
| 158 void fill(HeapWord* start, HeapWord* top, size_t new_size); | |
| 159 void initialize(); | |
| 160 | |
| 161 static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } | |
| 162 | |
| 163 // Code generation support | |
| 164 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } | |
| 165 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); } | |
| 166 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); } | |
| 167 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); } | |
| 168 static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); } | |
| 169 static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); } | |
| 170 | |
| 171 static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); } | |
| 172 static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); } | |
| 173 static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); } | |
| 174 | |
| 175 void verify(); | |
| 176 }; | |
| 177 | |
| 6197 | 178 class GlobalTLABStats: public CHeapObj<mtThread> { |
| 0 | 179 private: |
| 180 | |
| 181 // Accumulate perfdata in private variables because | |
| 182 // PerfData should be write-only for security reasons | |
| 183 // (see perfData.hpp) | |
| 184 unsigned _allocating_threads; | |
| 185 unsigned _total_refills; | |
| 186 unsigned _max_refills; | |
| 187 size_t _total_allocation; | |
| 188 size_t _total_gc_waste; | |
| 189 size_t _max_gc_waste; | |
| 190 size_t _total_slow_refill_waste; | |
| 191 size_t _max_slow_refill_waste; | |
| 192 size_t _total_fast_refill_waste; | |
| 193 size_t _max_fast_refill_waste; | |
| 194 unsigned _total_slow_allocations; | |
| 195 unsigned _max_slow_allocations; | |
| 196 | |
| 197 PerfVariable* _perf_allocating_threads; | |
| 198 PerfVariable* _perf_total_refills; | |
| 199 PerfVariable* _perf_max_refills; | |
| 200 PerfVariable* _perf_allocation; | |
| 201 PerfVariable* _perf_gc_waste; | |
| 202 PerfVariable* _perf_max_gc_waste; | |
| 203 PerfVariable* _perf_slow_refill_waste; | |
| 204 PerfVariable* _perf_max_slow_refill_waste; | |
| 205 PerfVariable* _perf_fast_refill_waste; | |
| 206 PerfVariable* _perf_max_fast_refill_waste; | |
| 207 PerfVariable* _perf_slow_allocations; | |
| 208 PerfVariable* _perf_max_slow_allocations; | |
| 209 | |
| 210 AdaptiveWeightedAverage _allocating_threads_avg; | |
| 211 | |
| 212 public: | |
| 213 GlobalTLABStats(); | |
| 214 | |
| 215 // Initialize all counters | |
| 216 void initialize(); | |
| 217 | |
| 218 // Write all perf counters to the perf_counters | |
| 219 void publish(); | |
| 220 | |
| 221 void print(); | |
| 222 | |
| 223 // Accessors | |
| 224 unsigned allocating_threads_avg() { | |
| 225 return MAX2((unsigned)(_allocating_threads_avg.average() + 0.5), 1U); | |
| 226 } | |
| 227 | |
| 228 size_t allocation() { | |
| 229 return _total_allocation; | |
| 230 } | |
| 231 | |
| 232 // Update methods | |
| 233 | |
| 234 void update_allocating_threads() { | |
| 235 _allocating_threads++; | |
| 236 } | |
| 237 void update_number_of_refills(unsigned value) { | |
| 238 _total_refills += value; | |
| 239 _max_refills = MAX2(_max_refills, value); | |
| 240 } | |
| 241 void update_allocation(size_t value) { | |
| 242 _total_allocation += value; | |
| 243 } | |
| 244 void update_gc_waste(size_t value) { | |
| 245 _total_gc_waste += value; | |
| 246 _max_gc_waste = MAX2(_max_gc_waste, value); | |
| 247 } | |
| 248 void update_fast_refill_waste(size_t value) { | |
| 249 _total_fast_refill_waste += value; | |
| 250 _max_fast_refill_waste = MAX2(_max_fast_refill_waste, value); | |
| 251 } | |
| 252 void update_slow_refill_waste(size_t value) { | |
| 253 _total_slow_refill_waste += value; | |
| 254 _max_slow_refill_waste = MAX2(_max_slow_refill_waste, value); | |
| 255 } | |
| 256 void update_slow_allocations(unsigned value) { | |
| 257 _total_slow_allocations += value; | |
| 258 _max_slow_allocations = MAX2(_max_slow_allocations, value); | |
| 259 } | |
| 260 }; | |
| 1972 | 261 |
| 262 #endif // SHARE_VM_MEMORY_THREADLOCALALLOCBUFFER_HPP |