Mercurial > hg > graal-compiler
comparison src/share/vm/memory/threadLocalAllocBuffer.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 9e321dcfa5b7 |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:a61af66fc99e |
---|---|
1 /* | |
2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class GlobalTLABStats; | |
26 | |
27 // ThreadLocalAllocBuffer: a descriptor for thread-local storage used by | |
28 // the threads for allocation. | |
29 // It is thread-private at any time, but maybe multiplexed over | |
30 // time across multiple threads. The park()/unpark() pair is | |
31 // used to make it avaiable for such multiplexing. | |
32 class ThreadLocalAllocBuffer: public CHeapObj { | |
33 friend class VMStructs; | |
34 private: | |
35 HeapWord* _start; // address of TLAB | |
36 HeapWord* _top; // address after last allocation | |
37 HeapWord* _pf_top; // allocation prefetch watermark | |
38 HeapWord* _end; // allocation end (excluding alignment_reserve) | |
39 size_t _desired_size; // desired size (including alignment_reserve) | |
40 size_t _refill_waste_limit; // hold onto tlab if free() is larger than this | |
41 | |
42 static unsigned _target_refills; // expected number of refills between GCs | |
43 | |
44 unsigned _number_of_refills; | |
45 unsigned _fast_refill_waste; | |
46 unsigned _slow_refill_waste; | |
47 unsigned _gc_waste; | |
48 unsigned _slow_allocations; | |
49 | |
50 AdaptiveWeightedAverage _allocation_fraction; // fraction of eden allocated in tlabs | |
51 | |
52 void accumulate_statistics(); | |
53 void initialize_statistics(); | |
54 | |
55 void set_start(HeapWord* start) { _start = start; } | |
56 void set_end(HeapWord* end) { _end = end; } | |
57 void set_top(HeapWord* top) { _top = top; } | |
58 void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; } | |
59 void set_desired_size(size_t desired_size) { _desired_size = desired_size; } | |
60 void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; } | |
61 | |
62 size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; } | |
63 | |
64 static int target_refills() { return _target_refills; } | |
65 size_t initial_desired_size(); | |
66 | |
67 size_t remaining() const { return end() == NULL ? 0 : pointer_delta(hard_end(), top()); } | |
68 | |
69 // Make parsable and release it. | |
70 void reset(); | |
71 | |
72 // Resize based on amount of allocation, etc. | |
73 void resize(); | |
74 | |
75 void invariants() const { assert(top() >= start() && top() <= end(), "invalid tlab"); } | |
76 | |
77 void initialize(HeapWord* start, HeapWord* top, HeapWord* end); | |
78 | |
79 void print_stats(const char* tag); | |
80 | |
81 Thread* myThread(); | |
82 | |
83 // statistics | |
84 | |
85 int number_of_refills() const { return _number_of_refills; } | |
86 int fast_refill_waste() const { return _fast_refill_waste; } | |
87 int slow_refill_waste() const { return _slow_refill_waste; } | |
88 int gc_waste() const { return _gc_waste; } | |
89 int slow_allocations() const { return _slow_allocations; } | |
90 | |
91 static GlobalTLABStats* _global_stats; | |
92 static GlobalTLABStats* global_stats() { return _global_stats; } | |
93 | |
94 public: | |
95 ThreadLocalAllocBuffer() : _allocation_fraction(TLABAllocationWeight) { | |
96 // do nothing. tlabs must be inited by initialize() calls | |
97 } | |
98 | |
99 static const size_t min_size() { return align_object_size(MinTLABSize / HeapWordSize); } | |
100 static const size_t max_size(); | |
101 | |
102 HeapWord* start() const { return _start; } | |
103 HeapWord* end() const { return _end; } | |
104 HeapWord* hard_end() const { return _end + alignment_reserve(); } | |
105 HeapWord* top() const { return _top; } | |
106 HeapWord* pf_top() const { return _pf_top; } | |
107 size_t desired_size() const { return _desired_size; } | |
108 size_t free() const { return pointer_delta(end(), top()); } | |
109 // Don't discard tlab if remaining space is larger than this. | |
110 size_t refill_waste_limit() const { return _refill_waste_limit; } | |
111 | |
112 // Allocate size HeapWords. The memory is NOT initialized to zero. | |
113 inline HeapWord* allocate(size_t size); | |
114 static size_t alignment_reserve() { return align_object_size(typeArrayOopDesc::header_size(T_INT)); } | |
115 static size_t alignment_reserve_in_bytes() { return alignment_reserve() * HeapWordSize; } | |
116 | |
117 // Return tlab size or remaining space in eden such that the | |
118 // space is large enough to hold obj_size and necessary fill space. | |
119 // Otherwise return 0; | |
120 inline size_t compute_size(size_t obj_size); | |
121 | |
122 // Record slow allocation | |
123 inline void record_slow_allocation(size_t obj_size); | |
124 | |
125 // Initialization at startup | |
126 static void startup_initialization(); | |
127 | |
128 // Make an in-use tlab parsable, optionally also retiring it. | |
129 void make_parsable(bool retire); | |
130 | |
131 // Retire in-use tlab before allocation of a new tlab | |
132 void clear_before_allocation(); | |
133 | |
134 // Accumulate statistics across all tlabs before gc | |
135 static void accumulate_statistics_before_gc(); | |
136 | |
137 // Resize tlabs for all threads | |
138 static void resize_all_tlabs(); | |
139 | |
140 void fill(HeapWord* start, HeapWord* top, size_t new_size); | |
141 void initialize(); | |
142 | |
143 static size_t refill_waste_limit_increment() { return TLABWasteIncrement; } | |
144 | |
145 // Code generation support | |
146 static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); } | |
147 static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); } | |
148 static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); } | |
149 static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); } | |
150 static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); } | |
151 static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); } | |
152 | |
153 static ByteSize number_of_refills_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _number_of_refills ); } | |
154 static ByteSize fast_refill_waste_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _fast_refill_waste ); } | |
155 static ByteSize slow_allocations_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _slow_allocations ); } | |
156 | |
157 void verify(); | |
158 }; | |
159 | |
160 class GlobalTLABStats: public CHeapObj { | |
161 private: | |
162 | |
163 // Accumulate perfdata in private variables because | |
164 // PerfData should be write-only for security reasons | |
165 // (see perfData.hpp) | |
166 unsigned _allocating_threads; | |
167 unsigned _total_refills; | |
168 unsigned _max_refills; | |
169 size_t _total_allocation; | |
170 size_t _total_gc_waste; | |
171 size_t _max_gc_waste; | |
172 size_t _total_slow_refill_waste; | |
173 size_t _max_slow_refill_waste; | |
174 size_t _total_fast_refill_waste; | |
175 size_t _max_fast_refill_waste; | |
176 unsigned _total_slow_allocations; | |
177 unsigned _max_slow_allocations; | |
178 | |
179 PerfVariable* _perf_allocating_threads; | |
180 PerfVariable* _perf_total_refills; | |
181 PerfVariable* _perf_max_refills; | |
182 PerfVariable* _perf_allocation; | |
183 PerfVariable* _perf_gc_waste; | |
184 PerfVariable* _perf_max_gc_waste; | |
185 PerfVariable* _perf_slow_refill_waste; | |
186 PerfVariable* _perf_max_slow_refill_waste; | |
187 PerfVariable* _perf_fast_refill_waste; | |
188 PerfVariable* _perf_max_fast_refill_waste; | |
189 PerfVariable* _perf_slow_allocations; | |
190 PerfVariable* _perf_max_slow_allocations; | |
191 | |
192 AdaptiveWeightedAverage _allocating_threads_avg; | |
193 | |
194 public: | |
195 GlobalTLABStats(); | |
196 | |
197 // Initialize all counters | |
198 void initialize(); | |
199 | |
200 // Write all perf counters to the perf_counters | |
201 void publish(); | |
202 | |
203 void print(); | |
204 | |
205 // Accessors | |
206 unsigned allocating_threads_avg() { | |
207 return MAX2((unsigned)(_allocating_threads_avg.average() + 0.5), 1U); | |
208 } | |
209 | |
210 size_t allocation() { | |
211 return _total_allocation; | |
212 } | |
213 | |
214 // Update methods | |
215 | |
216 void update_allocating_threads() { | |
217 _allocating_threads++; | |
218 } | |
219 void update_number_of_refills(unsigned value) { | |
220 _total_refills += value; | |
221 _max_refills = MAX2(_max_refills, value); | |
222 } | |
223 void update_allocation(size_t value) { | |
224 _total_allocation += value; | |
225 } | |
226 void update_gc_waste(size_t value) { | |
227 _total_gc_waste += value; | |
228 _max_gc_waste = MAX2(_max_gc_waste, value); | |
229 } | |
230 void update_fast_refill_waste(size_t value) { | |
231 _total_fast_refill_waste += value; | |
232 _max_fast_refill_waste = MAX2(_max_fast_refill_waste, value); | |
233 } | |
234 void update_slow_refill_waste(size_t value) { | |
235 _total_slow_refill_waste += value; | |
236 _max_slow_refill_waste = MAX2(_max_slow_refill_waste, value); | |
237 } | |
238 void update_slow_allocations(unsigned value) { | |
239 _total_slow_allocations += value; | |
240 _max_slow_allocations = MAX2(_max_slow_allocations, value); | |
241 } | |
242 }; |