Mercurial > hg > truffle
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 3229:4a6bda6cfe28
Fix for usages that are phi in rematerialization
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Thu, 21 Jul 2011 11:32:22 +0200 |
parents | b1a2afa37ec4 |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2011, 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 |
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118 if (retire) { |
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119 myThread()->incr_allocated_bytes(used_bytes()); |
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120 } |
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121 |
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122 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
0 | 123 |
124 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
125 set_start(NULL); | |
126 set_top(NULL); | |
127 set_pf_top(NULL); | |
128 set_end(NULL); | |
129 } | |
130 } | |
131 assert(!(retire || ZeroTLAB) || | |
132 (start() == NULL && end() == NULL && top() == NULL), | |
133 "TLAB must be reset"); | |
134 } | |
135 | |
136 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
137 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
138 thread->tlab().resize(); | |
139 } | |
140 } | |
141 | |
142 void ThreadLocalAllocBuffer::resize() { | |
143 | |
144 if (ResizeTLAB) { | |
145 // Compute the next tlab size using expected allocation amount | |
146 size_t alloc = (size_t)(_allocation_fraction.average() * | |
147 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
148 size_t new_size = alloc / _target_refills; | |
149 | |
150 new_size = MIN2(MAX2(new_size, min_size()), max_size()); | |
151 | |
152 size_t aligned_new_size = align_object_size(new_size); | |
153 | |
154 if (PrintTLAB && Verbose) { | |
155 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
156 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
157 myThread(), myThread()->osthread()->thread_id(), | |
158 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
159 } | |
160 set_desired_size(aligned_new_size); | |
161 | |
162 set_refill_waste_limit(initial_refill_waste_limit()); | |
163 } | |
164 } | |
165 | |
166 void ThreadLocalAllocBuffer::initialize_statistics() { | |
167 _number_of_refills = 0; | |
168 _fast_refill_waste = 0; | |
169 _slow_refill_waste = 0; | |
170 _gc_waste = 0; | |
171 _slow_allocations = 0; | |
172 } | |
173 | |
174 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
175 HeapWord* top, | |
176 size_t new_size) { | |
177 _number_of_refills++; | |
178 if (PrintTLAB && Verbose) { | |
179 print_stats("fill"); | |
180 } | |
181 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
182 initialize(start, top, start + new_size - alignment_reserve()); | |
183 | |
184 // Reset amount of internal fragmentation | |
185 set_refill_waste_limit(initial_refill_waste_limit()); | |
186 } | |
187 | |
188 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
189 HeapWord* top, | |
190 HeapWord* end) { | |
191 set_start(start); | |
192 set_top(top); | |
193 set_pf_top(top); | |
194 set_end(end); | |
195 invariants(); | |
196 } | |
197 | |
198 void ThreadLocalAllocBuffer::initialize() { | |
199 initialize(NULL, // start | |
200 NULL, // top | |
201 NULL); // end | |
202 | |
203 set_desired_size(initial_desired_size()); | |
204 | |
205 // Following check is needed because at startup the main (primordial) | |
206 // thread is initialized before the heap is. The initialization for | |
207 // this thread is redone in startup_initialization below. | |
208 if (Universe::heap() != NULL) { | |
209 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
210 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
211 _allocation_fraction.sample(alloc_frac); | |
212 } | |
213 | |
214 set_refill_waste_limit(initial_refill_waste_limit()); | |
215 | |
216 initialize_statistics(); | |
217 } | |
218 | |
219 void ThreadLocalAllocBuffer::startup_initialization() { | |
220 | |
221 // Assuming each thread's active tlab is, on average, | |
222 // 1/2 full at a GC | |
223 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
224 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
225 | |
226 _global_stats = new GlobalTLABStats(); | |
227 | |
228 // During jvm startup, the main (primordial) thread is initialized | |
229 // before the heap is initialized. So reinitialize it now. | |
230 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
231 Thread::current()->tlab().initialize(); | |
232 | |
233 if (PrintTLAB && Verbose) { | |
234 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
235 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
236 } | |
237 } | |
238 | |
239 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
240 size_t init_sz; | |
241 | |
242 if (TLABSize > 0) { | |
243 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
244 } else if (global_stats() == NULL) { | |
245 // Startup issue - main thread initialized before heap initialized. | |
246 init_sz = min_size(); | |
247 } else { | |
248 // Initial size is a function of the average number of allocating threads. | |
249 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
250 | |
251 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
252 (nof_threads * target_refills()); | |
253 init_sz = align_object_size(init_sz); | |
254 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
255 } | |
256 return init_sz; | |
257 } | |
258 | |
259 const size_t ThreadLocalAllocBuffer::max_size() { | |
260 | |
261 // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE]. | |
262 // This restriction could be removed by enabling filling with multiple arrays. | |
263 // If we compute that the reasonable way as | |
264 // header_size + ((sizeof(jint) * max_jint) / HeapWordSize) | |
265 // we'll overflow on the multiply, so we do the divide first. | |
266 // We actually lose a little by dividing first, | |
267 // but that just makes the TLAB somewhat smaller than the biggest array, | |
268 // which is fine, since we'll be able to fill that. | |
269 | |
270 size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) + | |
271 sizeof(jint) * | |
272 ((juint) max_jint / (size_t) HeapWordSize); | |
273 return align_size_down(unaligned_max_size, MinObjAlignment); | |
274 } | |
275 | |
276 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
277 Thread* thrd = myThread(); | |
278 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
279 size_t alloc = _number_of_refills * _desired_size; | |
280 double waste_percent = alloc == 0 ? 0.0 : | |
281 100.0 * waste / alloc; | |
282 size_t tlab_used = Universe::heap()->tlab_capacity(thrd) - | |
283 Universe::heap()->unsafe_max_tlab_alloc(thrd); | |
284 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" | |
285 " desired_size: " SIZE_FORMAT "KB" | |
286 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
287 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
288 " slow: %dB fast: %dB\n", | |
289 tag, thrd, thrd->osthread()->thread_id(), | |
290 _desired_size / (K / HeapWordSize), | |
291 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
292 _allocation_fraction.average(), | |
293 _allocation_fraction.average() * tlab_used / K, | |
294 _number_of_refills, waste_percent, | |
295 _gc_waste * HeapWordSize, | |
296 _slow_refill_waste * HeapWordSize, | |
297 _fast_refill_waste * HeapWordSize); | |
298 } | |
299 | |
300 void ThreadLocalAllocBuffer::verify() { | |
301 HeapWord* p = start(); | |
302 HeapWord* t = top(); | |
303 HeapWord* prev_p = NULL; | |
304 while (p < t) { | |
305 oop(p)->verify(); | |
306 prev_p = p; | |
307 p += oop(p)->size(); | |
308 } | |
309 guarantee(p == top(), "end of last object must match end of space"); | |
310 } | |
311 | |
312 Thread* ThreadLocalAllocBuffer::myThread() { | |
313 return (Thread*)(((char *)this) + | |
314 in_bytes(start_offset()) - | |
315 in_bytes(Thread::tlab_start_offset())); | |
316 } | |
317 | |
318 | |
319 GlobalTLABStats::GlobalTLABStats() : | |
320 _allocating_threads_avg(TLABAllocationWeight) { | |
321 | |
322 initialize(); | |
323 | |
324 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
325 | |
326 if (UsePerfData) { | |
327 | |
328 EXCEPTION_MARK; | |
329 ResourceMark rm; | |
330 | |
331 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
332 _perf_allocating_threads = | |
333 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
334 | |
335 cname = PerfDataManager::counter_name("tlab", "fills"); | |
336 _perf_total_refills = | |
337 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
338 | |
339 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
340 _perf_max_refills = | |
341 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
342 | |
343 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
344 _perf_allocation = | |
345 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
346 | |
347 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
348 _perf_gc_waste = | |
349 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
350 | |
351 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
352 _perf_max_gc_waste = | |
353 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
354 | |
355 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
356 _perf_slow_refill_waste = | |
357 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
358 | |
359 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
360 _perf_max_slow_refill_waste = | |
361 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
362 | |
363 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
364 _perf_fast_refill_waste = | |
365 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
366 | |
367 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
368 _perf_max_fast_refill_waste = | |
369 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
370 | |
371 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
372 _perf_slow_allocations = | |
373 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
374 | |
375 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
376 _perf_max_slow_allocations = | |
377 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
378 } | |
379 } | |
380 | |
381 void GlobalTLABStats::initialize() { | |
382 // Clear counters summarizing info from all threads | |
383 _allocating_threads = 0; | |
384 _total_refills = 0; | |
385 _max_refills = 0; | |
386 _total_allocation = 0; | |
387 _total_gc_waste = 0; | |
388 _max_gc_waste = 0; | |
389 _total_slow_refill_waste = 0; | |
390 _max_slow_refill_waste = 0; | |
391 _total_fast_refill_waste = 0; | |
392 _max_fast_refill_waste = 0; | |
393 _total_slow_allocations = 0; | |
394 _max_slow_allocations = 0; | |
395 } | |
396 | |
397 void GlobalTLABStats::publish() { | |
398 _allocating_threads_avg.sample(_allocating_threads); | |
399 if (UsePerfData) { | |
400 _perf_allocating_threads ->set_value(_allocating_threads); | |
401 _perf_total_refills ->set_value(_total_refills); | |
402 _perf_max_refills ->set_value(_max_refills); | |
403 _perf_allocation ->set_value(_total_allocation); | |
404 _perf_gc_waste ->set_value(_total_gc_waste); | |
405 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
406 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
407 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
408 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
409 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
410 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
411 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
412 } | |
413 } | |
414 | |
415 void GlobalTLABStats::print() { | |
416 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
417 double waste_percent = _total_allocation == 0 ? 0.0 : | |
418 100.0 * waste / _total_allocation; | |
419 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
420 " slow allocs: %d max %d waste: %4.1f%%" | |
421 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
422 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
423 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
424 _allocating_threads, | |
425 _total_refills, _max_refills, | |
426 _total_slow_allocations, _max_slow_allocations, | |
427 waste_percent, | |
428 _total_gc_waste * HeapWordSize, | |
429 _max_gc_waste * HeapWordSize, | |
430 _total_slow_refill_waste * HeapWordSize, | |
431 _max_slow_refill_waste * HeapWordSize, | |
432 _total_fast_refill_waste * HeapWordSize, | |
433 _max_fast_refill_waste * HeapWordSize); | |
434 } |