Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 832:e7d5557ad624
Merge
author | jmasa |
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date | Thu, 02 Jul 2009 16:28:15 -0700 |
parents | 0fbdb4381b99 |
children | 2dd52dea6d28 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 1999-2009 Sun Microsystems, Inc. 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 * | |
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 // Thread-Local Edens support | |
26 | |
27 # include "incls/_precompiled.incl" | |
28 # include "incls/_threadLocalAllocBuffer.cpp.incl" | |
29 | |
30 // static member initialization | |
31 unsigned ThreadLocalAllocBuffer::_target_refills = 0; | |
32 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
33 | |
34 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
35 _slow_refill_waste += (unsigned)remaining(); | |
36 make_parsable(true); // also retire the TLAB | |
37 } | |
38 | |
39 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
40 global_stats()->initialize(); | |
41 | |
42 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
43 thread->tlab().accumulate_statistics(); | |
44 thread->tlab().initialize_statistics(); | |
45 } | |
46 | |
47 // Publish new stats if some allocation occurred. | |
48 if (global_stats()->allocation() != 0) { | |
49 global_stats()->publish(); | |
50 if (PrintTLAB) { | |
51 global_stats()->print(); | |
52 } | |
53 } | |
54 } | |
55 | |
56 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
57 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
58 size_t unused = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize; | |
59 size_t used = capacity - unused; | |
60 | |
61 // Update allocation history if a reasonable amount of eden was allocated. | |
62 bool update_allocation_history = used > 0.5 * capacity; | |
63 | |
64 _gc_waste += (unsigned)remaining(); | |
65 | |
66 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
67 print_stats("gc"); | |
68 } | |
69 | |
70 if (_number_of_refills > 0) { | |
71 | |
72 if (update_allocation_history) { | |
73 // Average the fraction of eden allocated in a tlab by this | |
74 // thread for use in the next resize operation. | |
75 // _gc_waste is not subtracted because it's included in | |
76 // "used". | |
77 size_t allocation = _number_of_refills * desired_size(); | |
78 double alloc_frac = allocation / (double) used; | |
79 _allocation_fraction.sample(alloc_frac); | |
80 } | |
81 global_stats()->update_allocating_threads(); | |
82 global_stats()->update_number_of_refills(_number_of_refills); | |
83 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
84 global_stats()->update_gc_waste(_gc_waste); | |
85 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
86 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
87 | |
88 } else { | |
89 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && | |
90 _slow_refill_waste == 0 && _gc_waste == 0, | |
91 "tlab stats == 0"); | |
92 } | |
93 global_stats()->update_slow_allocations(_slow_allocations); | |
94 } | |
95 | |
96 // Fills the current tlab with a dummy filler array to create | |
97 // an illusion of a contiguous Eden and optionally retires the tlab. | |
98 // Waste accounting should be done in caller as appropriate; see, | |
99 // for example, clear_before_allocation(). | |
100 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
101 if (end() != NULL) { | |
102 invariants(); | |
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103 CollectedHeap::fill_with_object(top(), hard_end()); |
0 | 104 |
105 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
106 set_start(NULL); | |
107 set_top(NULL); | |
108 set_pf_top(NULL); | |
109 set_end(NULL); | |
110 } | |
111 } | |
112 assert(!(retire || ZeroTLAB) || | |
113 (start() == NULL && end() == NULL && top() == NULL), | |
114 "TLAB must be reset"); | |
115 } | |
116 | |
117 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
118 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
119 thread->tlab().resize(); | |
120 } | |
121 } | |
122 | |
123 void ThreadLocalAllocBuffer::resize() { | |
124 | |
125 if (ResizeTLAB) { | |
126 // Compute the next tlab size using expected allocation amount | |
127 size_t alloc = (size_t)(_allocation_fraction.average() * | |
128 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
129 size_t new_size = alloc / _target_refills; | |
130 | |
131 new_size = MIN2(MAX2(new_size, min_size()), max_size()); | |
132 | |
133 size_t aligned_new_size = align_object_size(new_size); | |
134 | |
135 if (PrintTLAB && Verbose) { | |
136 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
137 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
138 myThread(), myThread()->osthread()->thread_id(), | |
139 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
140 } | |
141 set_desired_size(aligned_new_size); | |
142 | |
143 set_refill_waste_limit(initial_refill_waste_limit()); | |
144 } | |
145 } | |
146 | |
147 void ThreadLocalAllocBuffer::initialize_statistics() { | |
148 _number_of_refills = 0; | |
149 _fast_refill_waste = 0; | |
150 _slow_refill_waste = 0; | |
151 _gc_waste = 0; | |
152 _slow_allocations = 0; | |
153 } | |
154 | |
155 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
156 HeapWord* top, | |
157 size_t new_size) { | |
158 _number_of_refills++; | |
159 if (PrintTLAB && Verbose) { | |
160 print_stats("fill"); | |
161 } | |
162 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
163 initialize(start, top, start + new_size - alignment_reserve()); | |
164 | |
165 // Reset amount of internal fragmentation | |
166 set_refill_waste_limit(initial_refill_waste_limit()); | |
167 } | |
168 | |
169 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
170 HeapWord* top, | |
171 HeapWord* end) { | |
172 set_start(start); | |
173 set_top(top); | |
174 set_pf_top(top); | |
175 set_end(end); | |
176 invariants(); | |
177 } | |
178 | |
179 void ThreadLocalAllocBuffer::initialize() { | |
180 initialize(NULL, // start | |
181 NULL, // top | |
182 NULL); // end | |
183 | |
184 set_desired_size(initial_desired_size()); | |
185 | |
186 // Following check is needed because at startup the main (primordial) | |
187 // thread is initialized before the heap is. The initialization for | |
188 // this thread is redone in startup_initialization below. | |
189 if (Universe::heap() != NULL) { | |
190 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
191 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
192 _allocation_fraction.sample(alloc_frac); | |
193 } | |
194 | |
195 set_refill_waste_limit(initial_refill_waste_limit()); | |
196 | |
197 initialize_statistics(); | |
198 } | |
199 | |
200 void ThreadLocalAllocBuffer::startup_initialization() { | |
201 | |
202 // Assuming each thread's active tlab is, on average, | |
203 // 1/2 full at a GC | |
204 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
205 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
206 | |
207 _global_stats = new GlobalTLABStats(); | |
208 | |
209 // During jvm startup, the main (primordial) thread is initialized | |
210 // before the heap is initialized. So reinitialize it now. | |
211 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
212 Thread::current()->tlab().initialize(); | |
213 | |
214 if (PrintTLAB && Verbose) { | |
215 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
216 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
217 } | |
218 } | |
219 | |
220 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
221 size_t init_sz; | |
222 | |
223 if (TLABSize > 0) { | |
224 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
225 } else if (global_stats() == NULL) { | |
226 // Startup issue - main thread initialized before heap initialized. | |
227 init_sz = min_size(); | |
228 } else { | |
229 // Initial size is a function of the average number of allocating threads. | |
230 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
231 | |
232 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
233 (nof_threads * target_refills()); | |
234 init_sz = align_object_size(init_sz); | |
235 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
236 } | |
237 return init_sz; | |
238 } | |
239 | |
240 const size_t ThreadLocalAllocBuffer::max_size() { | |
241 | |
242 // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE]. | |
243 // This restriction could be removed by enabling filling with multiple arrays. | |
244 // If we compute that the reasonable way as | |
245 // header_size + ((sizeof(jint) * max_jint) / HeapWordSize) | |
246 // we'll overflow on the multiply, so we do the divide first. | |
247 // We actually lose a little by dividing first, | |
248 // but that just makes the TLAB somewhat smaller than the biggest array, | |
249 // which is fine, since we'll be able to fill that. | |
250 | |
251 size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) + | |
252 sizeof(jint) * | |
253 ((juint) max_jint / (size_t) HeapWordSize); | |
254 return align_size_down(unaligned_max_size, MinObjAlignment); | |
255 } | |
256 | |
257 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
258 Thread* thrd = myThread(); | |
259 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
260 size_t alloc = _number_of_refills * _desired_size; | |
261 double waste_percent = alloc == 0 ? 0.0 : | |
262 100.0 * waste / alloc; | |
263 size_t tlab_used = Universe::heap()->tlab_capacity(thrd) - | |
264 Universe::heap()->unsafe_max_tlab_alloc(thrd); | |
265 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" | |
266 " desired_size: " SIZE_FORMAT "KB" | |
267 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
268 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
269 " slow: %dB fast: %dB\n", | |
270 tag, thrd, thrd->osthread()->thread_id(), | |
271 _desired_size / (K / HeapWordSize), | |
272 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
273 _allocation_fraction.average(), | |
274 _allocation_fraction.average() * tlab_used / K, | |
275 _number_of_refills, waste_percent, | |
276 _gc_waste * HeapWordSize, | |
277 _slow_refill_waste * HeapWordSize, | |
278 _fast_refill_waste * HeapWordSize); | |
279 } | |
280 | |
281 void ThreadLocalAllocBuffer::verify() { | |
282 HeapWord* p = start(); | |
283 HeapWord* t = top(); | |
284 HeapWord* prev_p = NULL; | |
285 while (p < t) { | |
286 oop(p)->verify(); | |
287 prev_p = p; | |
288 p += oop(p)->size(); | |
289 } | |
290 guarantee(p == top(), "end of last object must match end of space"); | |
291 } | |
292 | |
293 Thread* ThreadLocalAllocBuffer::myThread() { | |
294 return (Thread*)(((char *)this) + | |
295 in_bytes(start_offset()) - | |
296 in_bytes(Thread::tlab_start_offset())); | |
297 } | |
298 | |
299 | |
300 GlobalTLABStats::GlobalTLABStats() : | |
301 _allocating_threads_avg(TLABAllocationWeight) { | |
302 | |
303 initialize(); | |
304 | |
305 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
306 | |
307 if (UsePerfData) { | |
308 | |
309 EXCEPTION_MARK; | |
310 ResourceMark rm; | |
311 | |
312 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
313 _perf_allocating_threads = | |
314 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
315 | |
316 cname = PerfDataManager::counter_name("tlab", "fills"); | |
317 _perf_total_refills = | |
318 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
319 | |
320 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
321 _perf_max_refills = | |
322 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
323 | |
324 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
325 _perf_allocation = | |
326 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
327 | |
328 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
329 _perf_gc_waste = | |
330 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
331 | |
332 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
333 _perf_max_gc_waste = | |
334 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
335 | |
336 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
337 _perf_slow_refill_waste = | |
338 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
339 | |
340 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
341 _perf_max_slow_refill_waste = | |
342 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
343 | |
344 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
345 _perf_fast_refill_waste = | |
346 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
347 | |
348 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
349 _perf_max_fast_refill_waste = | |
350 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
351 | |
352 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
353 _perf_slow_allocations = | |
354 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
355 | |
356 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
357 _perf_max_slow_allocations = | |
358 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
359 } | |
360 } | |
361 | |
362 void GlobalTLABStats::initialize() { | |
363 // Clear counters summarizing info from all threads | |
364 _allocating_threads = 0; | |
365 _total_refills = 0; | |
366 _max_refills = 0; | |
367 _total_allocation = 0; | |
368 _total_gc_waste = 0; | |
369 _max_gc_waste = 0; | |
370 _total_slow_refill_waste = 0; | |
371 _max_slow_refill_waste = 0; | |
372 _total_fast_refill_waste = 0; | |
373 _max_fast_refill_waste = 0; | |
374 _total_slow_allocations = 0; | |
375 _max_slow_allocations = 0; | |
376 } | |
377 | |
378 void GlobalTLABStats::publish() { | |
379 _allocating_threads_avg.sample(_allocating_threads); | |
380 if (UsePerfData) { | |
381 _perf_allocating_threads ->set_value(_allocating_threads); | |
382 _perf_total_refills ->set_value(_total_refills); | |
383 _perf_max_refills ->set_value(_max_refills); | |
384 _perf_allocation ->set_value(_total_allocation); | |
385 _perf_gc_waste ->set_value(_total_gc_waste); | |
386 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
387 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
388 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
389 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
390 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
391 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
392 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
393 } | |
394 } | |
395 | |
396 void GlobalTLABStats::print() { | |
397 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
398 double waste_percent = _total_allocation == 0 ? 0.0 : | |
399 100.0 * waste / _total_allocation; | |
400 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
401 " slow allocs: %d max %d waste: %4.1f%%" | |
402 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
403 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
404 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
405 _allocating_threads, | |
406 _total_refills, _max_refills, | |
407 _total_slow_allocations, _max_slow_allocations, | |
408 waste_percent, | |
409 _total_gc_waste * HeapWordSize, | |
410 _max_gc_waste * HeapWordSize, | |
411 _total_slow_refill_waste * HeapWordSize, | |
412 _max_slow_refill_waste * HeapWordSize, | |
413 _total_fast_refill_waste * HeapWordSize, | |
414 _max_fast_refill_waste * HeapWordSize); | |
415 } |