Mercurial > hg > graal-compiler
annotate src/share/vm/memory/threadLocalAllocBuffer.cpp @ 7462:ade95d680b42
8004728: Add hotspot support for parameter reflection
Summary: Add hotspot support for parameter reflection
Reviewed-by: acorn, jrose, coleenp
Contributed-by: eric.mccorkle@oracle.com
author | coleenp |
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date | Tue, 08 Jan 2013 14:01:36 -0500 |
parents | f34d701e952e |
children | 579ee1eb0f30 1e1c8d358b52 |
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" | |
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31 #include "runtime/thread.inline.hpp" |
1972 | 32 #include "utilities/copy.hpp" |
0 | 33 |
1972 | 34 // Thread-Local Edens support |
0 | 35 |
36 // static member initialization | |
37 unsigned ThreadLocalAllocBuffer::_target_refills = 0; | |
38 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL; | |
39 | |
40 void ThreadLocalAllocBuffer::clear_before_allocation() { | |
41 _slow_refill_waste += (unsigned)remaining(); | |
42 make_parsable(true); // also retire the TLAB | |
43 } | |
44 | |
45 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() { | |
46 global_stats()->initialize(); | |
47 | |
48 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
49 thread->tlab().accumulate_statistics(); | |
50 thread->tlab().initialize_statistics(); | |
51 } | |
52 | |
53 // Publish new stats if some allocation occurred. | |
54 if (global_stats()->allocation() != 0) { | |
55 global_stats()->publish(); | |
56 if (PrintTLAB) { | |
57 global_stats()->print(); | |
58 } | |
59 } | |
60 } | |
61 | |
62 void ThreadLocalAllocBuffer::accumulate_statistics() { | |
63 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
64 size_t unused = Universe::heap()->unsafe_max_tlab_alloc(myThread()) / HeapWordSize; | |
65 size_t used = capacity - unused; | |
66 | |
67 // Update allocation history if a reasonable amount of eden was allocated. | |
68 bool update_allocation_history = used > 0.5 * capacity; | |
69 | |
70 _gc_waste += (unsigned)remaining(); | |
71 | |
72 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) { | |
73 print_stats("gc"); | |
74 } | |
75 | |
76 if (_number_of_refills > 0) { | |
77 | |
78 if (update_allocation_history) { | |
79 // Average the fraction of eden allocated in a tlab by this | |
80 // thread for use in the next resize operation. | |
81 // _gc_waste is not subtracted because it's included in | |
82 // "used". | |
83 size_t allocation = _number_of_refills * desired_size(); | |
84 double alloc_frac = allocation / (double) used; | |
85 _allocation_fraction.sample(alloc_frac); | |
86 } | |
87 global_stats()->update_allocating_threads(); | |
88 global_stats()->update_number_of_refills(_number_of_refills); | |
89 global_stats()->update_allocation(_number_of_refills * desired_size()); | |
90 global_stats()->update_gc_waste(_gc_waste); | |
91 global_stats()->update_slow_refill_waste(_slow_refill_waste); | |
92 global_stats()->update_fast_refill_waste(_fast_refill_waste); | |
93 | |
94 } else { | |
95 assert(_number_of_refills == 0 && _fast_refill_waste == 0 && | |
96 _slow_refill_waste == 0 && _gc_waste == 0, | |
97 "tlab stats == 0"); | |
98 } | |
99 global_stats()->update_slow_allocations(_slow_allocations); | |
100 } | |
101 | |
102 // Fills the current tlab with a dummy filler array to create | |
103 // an illusion of a contiguous Eden and optionally retires the tlab. | |
104 // Waste accounting should be done in caller as appropriate; see, | |
105 // for example, clear_before_allocation(). | |
106 void ThreadLocalAllocBuffer::make_parsable(bool retire) { | |
107 if (end() != NULL) { | |
108 invariants(); | |
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109 |
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110 if (retire) { |
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111 myThread()->incr_allocated_bytes(used_bytes()); |
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112 } |
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113 |
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114 CollectedHeap::fill_with_object(top(), hard_end(), retire); |
0 | 115 |
116 if (retire || ZeroTLAB) { // "Reset" the TLAB | |
117 set_start(NULL); | |
118 set_top(NULL); | |
119 set_pf_top(NULL); | |
120 set_end(NULL); | |
121 } | |
122 } | |
123 assert(!(retire || ZeroTLAB) || | |
124 (start() == NULL && end() == NULL && top() == NULL), | |
125 "TLAB must be reset"); | |
126 } | |
127 | |
128 void ThreadLocalAllocBuffer::resize_all_tlabs() { | |
129 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
130 thread->tlab().resize(); | |
131 } | |
132 } | |
133 | |
134 void ThreadLocalAllocBuffer::resize() { | |
135 | |
136 if (ResizeTLAB) { | |
137 // Compute the next tlab size using expected allocation amount | |
138 size_t alloc = (size_t)(_allocation_fraction.average() * | |
139 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize)); | |
140 size_t new_size = alloc / _target_refills; | |
141 | |
142 new_size = MIN2(MAX2(new_size, min_size()), max_size()); | |
143 | |
144 size_t aligned_new_size = align_object_size(new_size); | |
145 | |
146 if (PrintTLAB && Verbose) { | |
147 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]" | |
148 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n", | |
149 myThread(), myThread()->osthread()->thread_id(), | |
150 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size); | |
151 } | |
152 set_desired_size(aligned_new_size); | |
153 | |
154 set_refill_waste_limit(initial_refill_waste_limit()); | |
155 } | |
156 } | |
157 | |
158 void ThreadLocalAllocBuffer::initialize_statistics() { | |
159 _number_of_refills = 0; | |
160 _fast_refill_waste = 0; | |
161 _slow_refill_waste = 0; | |
162 _gc_waste = 0; | |
163 _slow_allocations = 0; | |
164 } | |
165 | |
166 void ThreadLocalAllocBuffer::fill(HeapWord* start, | |
167 HeapWord* top, | |
168 size_t new_size) { | |
169 _number_of_refills++; | |
170 if (PrintTLAB && Verbose) { | |
171 print_stats("fill"); | |
172 } | |
173 assert(top <= start + new_size - alignment_reserve(), "size too small"); | |
174 initialize(start, top, start + new_size - alignment_reserve()); | |
175 | |
176 // Reset amount of internal fragmentation | |
177 set_refill_waste_limit(initial_refill_waste_limit()); | |
178 } | |
179 | |
180 void ThreadLocalAllocBuffer::initialize(HeapWord* start, | |
181 HeapWord* top, | |
182 HeapWord* end) { | |
183 set_start(start); | |
184 set_top(top); | |
185 set_pf_top(top); | |
186 set_end(end); | |
187 invariants(); | |
188 } | |
189 | |
190 void ThreadLocalAllocBuffer::initialize() { | |
191 initialize(NULL, // start | |
192 NULL, // top | |
193 NULL); // end | |
194 | |
195 set_desired_size(initial_desired_size()); | |
196 | |
197 // Following check is needed because at startup the main (primordial) | |
198 // thread is initialized before the heap is. The initialization for | |
199 // this thread is redone in startup_initialization below. | |
200 if (Universe::heap() != NULL) { | |
201 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize; | |
202 double alloc_frac = desired_size() * target_refills() / (double) capacity; | |
203 _allocation_fraction.sample(alloc_frac); | |
204 } | |
205 | |
206 set_refill_waste_limit(initial_refill_waste_limit()); | |
207 | |
208 initialize_statistics(); | |
209 } | |
210 | |
211 void ThreadLocalAllocBuffer::startup_initialization() { | |
212 | |
213 // Assuming each thread's active tlab is, on average, | |
214 // 1/2 full at a GC | |
215 _target_refills = 100 / (2 * TLABWasteTargetPercent); | |
216 _target_refills = MAX2(_target_refills, (unsigned)1U); | |
217 | |
218 _global_stats = new GlobalTLABStats(); | |
219 | |
220 // During jvm startup, the main (primordial) thread is initialized | |
221 // before the heap is initialized. So reinitialize it now. | |
222 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread"); | |
223 Thread::current()->tlab().initialize(); | |
224 | |
225 if (PrintTLAB && Verbose) { | |
226 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n", | |
227 min_size(), Thread::current()->tlab().initial_desired_size(), max_size()); | |
228 } | |
229 } | |
230 | |
231 size_t ThreadLocalAllocBuffer::initial_desired_size() { | |
232 size_t init_sz; | |
233 | |
234 if (TLABSize > 0) { | |
235 init_sz = MIN2(TLABSize / HeapWordSize, max_size()); | |
236 } else if (global_stats() == NULL) { | |
237 // Startup issue - main thread initialized before heap initialized. | |
238 init_sz = min_size(); | |
239 } else { | |
240 // Initial size is a function of the average number of allocating threads. | |
241 unsigned nof_threads = global_stats()->allocating_threads_avg(); | |
242 | |
243 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) / | |
244 (nof_threads * target_refills()); | |
245 init_sz = align_object_size(init_sz); | |
246 init_sz = MIN2(MAX2(init_sz, min_size()), max_size()); | |
247 } | |
248 return init_sz; | |
249 } | |
250 | |
251 const size_t ThreadLocalAllocBuffer::max_size() { | |
252 | |
253 // TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE]. | |
254 // This restriction could be removed by enabling filling with multiple arrays. | |
255 // If we compute that the reasonable way as | |
256 // header_size + ((sizeof(jint) * max_jint) / HeapWordSize) | |
257 // we'll overflow on the multiply, so we do the divide first. | |
258 // We actually lose a little by dividing first, | |
259 // but that just makes the TLAB somewhat smaller than the biggest array, | |
260 // which is fine, since we'll be able to fill that. | |
261 | |
262 size_t unaligned_max_size = typeArrayOopDesc::header_size(T_INT) + | |
263 sizeof(jint) * | |
264 ((juint) max_jint / (size_t) HeapWordSize); | |
265 return align_size_down(unaligned_max_size, MinObjAlignment); | |
266 } | |
267 | |
268 void ThreadLocalAllocBuffer::print_stats(const char* tag) { | |
269 Thread* thrd = myThread(); | |
270 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste; | |
271 size_t alloc = _number_of_refills * _desired_size; | |
272 double waste_percent = alloc == 0 ? 0.0 : | |
273 100.0 * waste / alloc; | |
274 size_t tlab_used = Universe::heap()->tlab_capacity(thrd) - | |
275 Universe::heap()->unsafe_max_tlab_alloc(thrd); | |
276 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]" | |
277 " desired_size: " SIZE_FORMAT "KB" | |
278 " slow allocs: %d refill waste: " SIZE_FORMAT "B" | |
279 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB" | |
280 " slow: %dB fast: %dB\n", | |
281 tag, thrd, thrd->osthread()->thread_id(), | |
282 _desired_size / (K / HeapWordSize), | |
283 _slow_allocations, _refill_waste_limit * HeapWordSize, | |
284 _allocation_fraction.average(), | |
285 _allocation_fraction.average() * tlab_used / K, | |
286 _number_of_refills, waste_percent, | |
287 _gc_waste * HeapWordSize, | |
288 _slow_refill_waste * HeapWordSize, | |
289 _fast_refill_waste * HeapWordSize); | |
290 } | |
291 | |
292 void ThreadLocalAllocBuffer::verify() { | |
293 HeapWord* p = start(); | |
294 HeapWord* t = top(); | |
295 HeapWord* prev_p = NULL; | |
296 while (p < t) { | |
297 oop(p)->verify(); | |
298 prev_p = p; | |
299 p += oop(p)->size(); | |
300 } | |
301 guarantee(p == top(), "end of last object must match end of space"); | |
302 } | |
303 | |
304 Thread* ThreadLocalAllocBuffer::myThread() { | |
305 return (Thread*)(((char *)this) + | |
306 in_bytes(start_offset()) - | |
307 in_bytes(Thread::tlab_start_offset())); | |
308 } | |
309 | |
310 | |
311 GlobalTLABStats::GlobalTLABStats() : | |
312 _allocating_threads_avg(TLABAllocationWeight) { | |
313 | |
314 initialize(); | |
315 | |
316 _allocating_threads_avg.sample(1); // One allocating thread at startup | |
317 | |
318 if (UsePerfData) { | |
319 | |
320 EXCEPTION_MARK; | |
321 ResourceMark rm; | |
322 | |
323 char* cname = PerfDataManager::counter_name("tlab", "allocThreads"); | |
324 _perf_allocating_threads = | |
325 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
326 | |
327 cname = PerfDataManager::counter_name("tlab", "fills"); | |
328 _perf_total_refills = | |
329 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
330 | |
331 cname = PerfDataManager::counter_name("tlab", "maxFills"); | |
332 _perf_max_refills = | |
333 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
334 | |
335 cname = PerfDataManager::counter_name("tlab", "alloc"); | |
336 _perf_allocation = | |
337 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
338 | |
339 cname = PerfDataManager::counter_name("tlab", "gcWaste"); | |
340 _perf_gc_waste = | |
341 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
342 | |
343 cname = PerfDataManager::counter_name("tlab", "maxGcWaste"); | |
344 _perf_max_gc_waste = | |
345 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
346 | |
347 cname = PerfDataManager::counter_name("tlab", "slowWaste"); | |
348 _perf_slow_refill_waste = | |
349 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
350 | |
351 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste"); | |
352 _perf_max_slow_refill_waste = | |
353 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
354 | |
355 cname = PerfDataManager::counter_name("tlab", "fastWaste"); | |
356 _perf_fast_refill_waste = | |
357 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
358 | |
359 cname = PerfDataManager::counter_name("tlab", "maxFastWaste"); | |
360 _perf_max_fast_refill_waste = | |
361 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK); | |
362 | |
363 cname = PerfDataManager::counter_name("tlab", "slowAlloc"); | |
364 _perf_slow_allocations = | |
365 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
366 | |
367 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc"); | |
368 _perf_max_slow_allocations = | |
369 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK); | |
370 } | |
371 } | |
372 | |
373 void GlobalTLABStats::initialize() { | |
374 // Clear counters summarizing info from all threads | |
375 _allocating_threads = 0; | |
376 _total_refills = 0; | |
377 _max_refills = 0; | |
378 _total_allocation = 0; | |
379 _total_gc_waste = 0; | |
380 _max_gc_waste = 0; | |
381 _total_slow_refill_waste = 0; | |
382 _max_slow_refill_waste = 0; | |
383 _total_fast_refill_waste = 0; | |
384 _max_fast_refill_waste = 0; | |
385 _total_slow_allocations = 0; | |
386 _max_slow_allocations = 0; | |
387 } | |
388 | |
389 void GlobalTLABStats::publish() { | |
390 _allocating_threads_avg.sample(_allocating_threads); | |
391 if (UsePerfData) { | |
392 _perf_allocating_threads ->set_value(_allocating_threads); | |
393 _perf_total_refills ->set_value(_total_refills); | |
394 _perf_max_refills ->set_value(_max_refills); | |
395 _perf_allocation ->set_value(_total_allocation); | |
396 _perf_gc_waste ->set_value(_total_gc_waste); | |
397 _perf_max_gc_waste ->set_value(_max_gc_waste); | |
398 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste); | |
399 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste); | |
400 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste); | |
401 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste); | |
402 _perf_slow_allocations ->set_value(_total_slow_allocations); | |
403 _perf_max_slow_allocations ->set_value(_max_slow_allocations); | |
404 } | |
405 } | |
406 | |
407 void GlobalTLABStats::print() { | |
408 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste; | |
409 double waste_percent = _total_allocation == 0 ? 0.0 : | |
410 100.0 * waste / _total_allocation; | |
411 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d" | |
412 " slow allocs: %d max %d waste: %4.1f%%" | |
413 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
414 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B" | |
415 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n", | |
416 _allocating_threads, | |
417 _total_refills, _max_refills, | |
418 _total_slow_allocations, _max_slow_allocations, | |
419 waste_percent, | |
420 _total_gc_waste * HeapWordSize, | |
421 _max_gc_waste * HeapWordSize, | |
422 _total_slow_refill_waste * HeapWordSize, | |
423 _max_slow_refill_waste * HeapWordSize, | |
424 _total_fast_refill_waste * HeapWordSize, | |
425 _max_fast_refill_waste * HeapWordSize); | |
426 } |