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annotate src/share/vm/memory/threadLocalAllocBuffer.hpp @ 20198:c49dcaf78a65
8042737: Introduce umbrella header prefetch.inline.hpp
Reviewed-by: twisti, stefank
author | goetz |
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date | Thu, 08 May 2014 15:37:17 +0200 |
parents | cfd4aac53239 |
children | 4ca6dc0799b6 060cdf93040c |
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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 | |
108 static const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize); } | |
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 |