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annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 2014:4de5f4101cfd
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author | iveresov |
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date | Wed, 08 Dec 2010 17:50:49 -0800 |
parents | f95d63e2154a |
children | b1a2afa37ec4 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, 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 #include "precompiled.hpp" |
26 #include "memory/genCollectedHeap.hpp" | |
27 #include "memory/resourceArea.hpp" | |
28 #include "memory/threadLocalAllocBuffer.inline.hpp" | |
29 #include "memory/universe.inline.hpp" | |
30 #include "oops/oop.inline.hpp" | |
31 #include "utilities/copy.hpp" | |
32 #ifdef TARGET_OS_FAMILY_linux | |
33 # include "thread_linux.inline.hpp" | |
34 #endif | |
35 #ifdef TARGET_OS_FAMILY_solaris | |
36 # include "thread_solaris.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_OS_FAMILY_windows | |
39 # include "thread_windows.inline.hpp" | |
40 #endif | |
0 | 41 |
1972 | 42 // Thread-Local Edens support |
0 | 43 |
44 // static member initialization | |
45 unsigned ThreadLocalAllocBuffer::_target_refills = 0; | |
46 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
47 | |
48 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
49 _slow_refill_waste += (unsigned)remaining(); | |
50 make_parsable(true); // also retire the TLAB | |
51 } | |
52 | |
53 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
54 global_stats()->initialize(); | |
55 | |
56 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
57 thread->tlab().accumulate_statistics(); | |
58 thread->tlab().initialize_statistics(); | |
59 } | |
60 | |
61 // Publish new stats if some allocation occurred. | |
62 if (global_stats()->allocation() != 0) { | |
63 global_stats()->publish(); | |
64 if (PrintTLAB) { | |
65 global_stats()->print(); | |
66 } | |
67 } | |
68 } | |
69 | |
70 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
71 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
72 size_t unused = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize; | |
73 size_t used = capacity - unused; | |
74 | |
75 // Update allocation history if a reasonable amount of eden was allocated. | |
76 bool update_allocation_history = used > 0.5 * capacity; | |
77 | |
78 _gc_waste += (unsigned)remaining(); | |
79 | |
80 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
81 print_stats("gc"); | |
82 } | |
83 | |
84 if (_number_of_refills > 0) { | |
85 | |
86 if (update_allocation_history) { | |
87 // Average the fraction of eden allocated in a tlab by this | |
88 // thread for use in the next resize operation. | |
89 // _gc_waste is not subtracted because it's included in | |
90 // "used". | |
91 size_t allocation = _number_of_refills * desired_size(); | |
92 double alloc_frac = allocation / (double) used; | |
93 _allocation_fraction.sample(alloc_frac); | |
94 } | |
95 global_stats()->update_allocating_threads(); | |
96 global_stats()->update_number_of_refills(_number_of_refills); | |
97 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
98 global_stats()->update_gc_waste(_gc_waste); | |
99 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
100 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
101 | |
102 } else { | |
103 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && | |
104 _slow_refill_waste == 0 && _gc_waste == 0, | |
105 "tlab stats == 0"); | |
106 } | |
107 global_stats()->update_slow_allocations(_slow_allocations); | |
108 } | |
109 | |
110 // Fills the current tlab with a dummy filler array to create | |
111 // an illusion of a contiguous Eden and optionally retires the tlab. | |
112 // Waste accounting should be done in caller as appropriate; see, | |
113 // for example, clear_before_allocation(). | |
114 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
115 if (end() != NULL) { | |
116 invariants(); | |
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117 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
0 | 118 |
119 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
120 set_start(NULL); | |
121 set_top(NULL); | |
122 set_pf_top(NULL); | |
123 set_end(NULL); | |
124 } | |
125 } | |
126 assert(!(retire || ZeroTLAB) || | |
127 (start() == NULL && end() == NULL && top() == NULL), | |
128 "TLAB must be reset"); | |
129 } | |
130 | |
131 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
132 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
133 thread->tlab().resize(); | |
134 } | |
135 } | |
136 | |
137 void ThreadLocalAllocBuffer::resize() { | |
138 | |
139 if (ResizeTLAB) { | |
140 // Compute the next tlab size using expected allocation amount | |
141 size_t alloc = (size_t)(_allocation_fraction.average() * | |
142 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
143 size_t new_size = alloc / _target_refills; | |
144 | |
145 new_size = MIN2(MAX2(new_size, min_size()), max_size()); | |
146 | |
147 size_t aligned_new_size = align_object_size(new_size); | |
148 | |
149 if (PrintTLAB && Verbose) { | |
150 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
151 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
152 myThread(), myThread()->osthread()->thread_id(), | |
153 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
154 } | |
155 set_desired_size(aligned_new_size); | |
156 | |
157 set_refill_waste_limit(initial_refill_waste_limit()); | |
158 } | |
159 } | |
160 | |
161 void ThreadLocalAllocBuffer::initialize_statistics() { | |
162 _number_of_refills = 0; | |
163 _fast_refill_waste = 0; | |
164 _slow_refill_waste = 0; | |
165 _gc_waste = 0; | |
166 _slow_allocations = 0; | |
167 } | |
168 | |
169 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
170 HeapWord* top, | |
171 size_t new_size) { | |
172 _number_of_refills++; | |
173 if (PrintTLAB && Verbose) { | |
174 print_stats("fill"); | |
175 } | |
176 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
177 initialize(start, top, start + new_size - alignment_reserve()); | |
178 | |
179 // Reset amount of internal fragmentation | |
180 set_refill_waste_limit(initial_refill_waste_limit()); | |
181 } | |
182 | |
183 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
184 HeapWord* top, | |
185 HeapWord* end) { | |
186 set_start(start); | |
187 set_top(top); | |
188 set_pf_top(top); | |
189 set_end(end); | |
190 invariants(); | |
191 } | |
192 | |
193 void ThreadLocalAllocBuffer::initialize() { | |
194 initialize(NULL, // start | |
195 NULL, // top | |
196 NULL); // end | |
197 | |
198 set_desired_size(initial_desired_size()); | |
199 | |
200 // Following check is needed because at startup the main (primordial) | |
201 // thread is initialized before the heap is. The initialization for | |
202 // this thread is redone in startup_initialization below. | |
203 if (Universe::heap() != NULL) { | |
204 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
205 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
206 _allocation_fraction.sample(alloc_frac); | |
207 } | |
208 | |
209 set_refill_waste_limit(initial_refill_waste_limit()); | |
210 | |
211 initialize_statistics(); | |
212 } | |
213 | |
214 void ThreadLocalAllocBuffer::startup_initialization() { | |
215 | |
216 // Assuming each thread's active tlab is, on average, | |
217 // 1/2 full at a GC | |
218 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
219 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
220 | |
221 _global_stats = new GlobalTLABStats(); | |
222 | |
223 // During jvm startup, the main (primordial) thread is initialized | |
224 // before the heap is initialized. So reinitialize it now. | |
225 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
226 Thread::current()->tlab().initialize(); | |
227 | |
228 if (PrintTLAB && Verbose) { | |
229 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
230 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
231 } | |
232 } | |
233 | |
234 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
235 size_t init_sz; | |
236 | |
237 if (TLABSize > 0) { | |
238 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
239 } else if (global_stats() == NULL) { | |
240 // Startup issue - main thread initialized before heap initialized. | |
241 init_sz = min_size(); | |
242 } else { | |
243 // Initial size is a function of the average number of allocating threads. | |
244 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
245 | |
246 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
247 (nof_threads * target_refills()); | |
248 init_sz = align_object_size(init_sz); | |
249 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
250 } | |
251 return init_sz; | |
252 } | |
253 | |
254 const size_t ThreadLocalAllocBuffer::max_size() { | |
255 | |
256 // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE]. | |
257 // This restriction could be removed by enabling filling with multiple arrays. | |
258 // If we compute that the reasonable way as | |
259 // header_size + ((sizeof(jint) * max_jint) / HeapWordSize) | |
260 // we'll overflow on the multiply, so we do the divide first. | |
261 // We actually lose a little by dividing first, | |
262 // but that just makes the TLAB somewhat smaller than the biggest array, | |
263 // which is fine, since we'll be able to fill that. | |
264 | |
265 size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) + | |
266 sizeof(jint) * | |
267 ((juint) max_jint / (size_t) HeapWordSize); | |
268 return align_size_down(unaligned_max_size, MinObjAlignment); | |
269 } | |
270 | |
271 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
272 Thread* thrd = myThread(); | |
273 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
274 size_t alloc = _number_of_refills * _desired_size; | |
275 double waste_percent = alloc == 0 ? 0.0 : | |
276 100.0 * waste / alloc; | |
277 size_t tlab_used = Universe::heap()->tlab_capacity(thrd) - | |
278 Universe::heap()->unsafe_max_tlab_alloc(thrd); | |
279 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" | |
280 " desired_size: " SIZE_FORMAT "KB" | |
281 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
282 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
283 " slow: %dB fast: %dB\n", | |
284 tag, thrd, thrd->osthread()->thread_id(), | |
285 _desired_size / (K / HeapWordSize), | |
286 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
287 _allocation_fraction.average(), | |
288 _allocation_fraction.average() * tlab_used / K, | |
289 _number_of_refills, waste_percent, | |
290 _gc_waste * HeapWordSize, | |
291 _slow_refill_waste * HeapWordSize, | |
292 _fast_refill_waste * HeapWordSize); | |
293 } | |
294 | |
295 void ThreadLocalAllocBuffer::verify() { | |
296 HeapWord* p = start(); | |
297 HeapWord* t = top(); | |
298 HeapWord* prev_p = NULL; | |
299 while (p < t) { | |
300 oop(p)->verify(); | |
301 prev_p = p; | |
302 p += oop(p)->size(); | |
303 } | |
304 guarantee(p == top(), "end of last object must match end of space"); | |
305 } | |
306 | |
307 Thread* ThreadLocalAllocBuffer::myThread() { | |
308 return (Thread*)(((char *)this) + | |
309 in_bytes(start_offset()) - | |
310 in_bytes(Thread::tlab_start_offset())); | |
311 } | |
312 | |
313 | |
314 GlobalTLABStats::GlobalTLABStats() : | |
315 _allocating_threads_avg(TLABAllocationWeight) { | |
316 | |
317 initialize(); | |
318 | |
319 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
320 | |
321 if (UsePerfData) { | |
322 | |
323 EXCEPTION_MARK; | |
324 ResourceMark rm; | |
325 | |
326 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
327 _perf_allocating_threads = | |
328 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
329 | |
330 cname = PerfDataManager::counter_name("tlab", "fills"); | |
331 _perf_total_refills = | |
332 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
333 | |
334 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
335 _perf_max_refills = | |
336 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
337 | |
338 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
339 _perf_allocation = | |
340 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
341 | |
342 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
343 _perf_gc_waste = | |
344 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
345 | |
346 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
347 _perf_max_gc_waste = | |
348 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
349 | |
350 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
351 _perf_slow_refill_waste = | |
352 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
353 | |
354 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
355 _perf_max_slow_refill_waste = | |
356 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
357 | |
358 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
359 _perf_fast_refill_waste = | |
360 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
361 | |
362 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
363 _perf_max_fast_refill_waste = | |
364 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
365 | |
366 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
367 _perf_slow_allocations = | |
368 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
369 | |
370 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
371 _perf_max_slow_allocations = | |
372 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
373 } | |
374 } | |
375 | |
376 void GlobalTLABStats::initialize() { | |
377 // Clear counters summarizing info from all threads | |
378 _allocating_threads = 0; | |
379 _total_refills = 0; | |
380 _max_refills = 0; | |
381 _total_allocation = 0; | |
382 _total_gc_waste = 0; | |
383 _max_gc_waste = 0; | |
384 _total_slow_refill_waste = 0; | |
385 _max_slow_refill_waste = 0; | |
386 _total_fast_refill_waste = 0; | |
387 _max_fast_refill_waste = 0; | |
388 _total_slow_allocations = 0; | |
389 _max_slow_allocations = 0; | |
390 } | |
391 | |
392 void GlobalTLABStats::publish() { | |
393 _allocating_threads_avg.sample(_allocating_threads); | |
394 if (UsePerfData) { | |
395 _perf_allocating_threads ->set_value(_allocating_threads); | |
396 _perf_total_refills ->set_value(_total_refills); | |
397 _perf_max_refills ->set_value(_max_refills); | |
398 _perf_allocation ->set_value(_total_allocation); | |
399 _perf_gc_waste ->set_value(_total_gc_waste); | |
400 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
401 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
402 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
403 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
404 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
405 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
406 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
407 } | |
408 } | |
409 | |
410 void GlobalTLABStats::print() { | |
411 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
412 double waste_percent = _total_allocation == 0 ? 0.0 : | |
413 100.0 * waste / _total_allocation; | |
414 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
415 " slow allocs: %d max %d waste: %4.1f%%" | |
416 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
417 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
418 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
419 _allocating_threads, | |
420 _total_refills, _max_refills, | |
421 _total_slow_allocations, _max_slow_allocations, | |
422 waste_percent, | |
423 _total_gc_waste * HeapWordSize, | |
424 _max_gc_waste * HeapWordSize, | |
425 _total_slow_refill_waste * HeapWordSize, | |
426 _max_slow_refill_waste * HeapWordSize, | |
427 _total_fast_refill_waste * HeapWordSize, | |
428 _max_fast_refill_waste * HeapWordSize); | |
429 } |