Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/asPSYoungGen.cpp @ 140:3febac328d82
Merge
author | apetrusenko |
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date | Wed, 16 Apr 2008 12:58:03 +0400 |
parents | 183f41cf8bfe |
children | d1605aabd0a1 12eea04c8b06 |
rev | line source |
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0 | 1 /* |
2 * Copyright 2003-2006 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 # include "incls/_precompiled.incl" | |
26 # include "incls/_asPSYoungGen.cpp.incl" | |
27 | |
28 ASPSYoungGen::ASPSYoungGen(size_t init_byte_size, | |
29 size_t minimum_byte_size, | |
30 size_t byte_size_limit) : | |
31 PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
32 _gen_size_limit(byte_size_limit) { | |
33 } | |
34 | |
35 | |
36 ASPSYoungGen::ASPSYoungGen(PSVirtualSpace* vs, | |
37 size_t init_byte_size, | |
38 size_t minimum_byte_size, | |
39 size_t byte_size_limit) : | |
40 //PSYoungGen(init_byte_size, minimum_byte_size, byte_size_limit), | |
41 PSYoungGen(vs->committed_size(), minimum_byte_size, byte_size_limit), | |
42 _gen_size_limit(byte_size_limit) { | |
43 | |
44 assert(vs->committed_size() == init_byte_size, "Cannot replace with"); | |
45 | |
46 _virtual_space = vs; | |
47 } | |
48 | |
49 void ASPSYoungGen::initialize_virtual_space(ReservedSpace rs, | |
50 size_t alignment) { | |
51 assert(_init_gen_size != 0, "Should have a finite size"); | |
52 _virtual_space = new PSVirtualSpaceHighToLow(rs, alignment); | |
53 if (!_virtual_space->expand_by(_init_gen_size)) { | |
54 vm_exit_during_initialization("Could not reserve enough space for " | |
55 "object heap"); | |
56 } | |
57 } | |
58 | |
59 void ASPSYoungGen::initialize(ReservedSpace rs, size_t alignment) { | |
60 initialize_virtual_space(rs, alignment); | |
61 initialize_work(); | |
62 } | |
63 | |
64 size_t ASPSYoungGen::available_for_expansion() { | |
65 | |
66 size_t current_committed_size = virtual_space()->committed_size(); | |
67 assert((gen_size_limit() >= current_committed_size), | |
68 "generation size limit is wrong"); | |
69 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
70 size_t result = gen_size_limit() - current_committed_size; | |
71 size_t result_aligned = align_size_down(result, heap->young_gen_alignment()); | |
72 return result_aligned; | |
73 } | |
74 | |
75 // Return the number of bytes the young gen is willing give up. | |
76 // | |
77 // Future implementations could check the survivors and if to_space is in the | |
78 // right place (below from_space), take a chunk from to_space. | |
79 size_t ASPSYoungGen::available_for_contraction() { | |
80 | |
81 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
82 if (uncommitted_bytes != 0) { | |
83 return uncommitted_bytes; | |
84 } | |
85 | |
86 if (eden_space()->is_empty()) { | |
87 // Respect the minimum size for eden and for the young gen as a whole. | |
88 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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89 const size_t eden_alignment = heap->intra_heap_alignment(); |
0 | 90 const size_t gen_alignment = heap->young_gen_alignment(); |
91 | |
92 assert(eden_space()->capacity_in_bytes() >= eden_alignment, | |
93 "Alignment is wrong"); | |
94 size_t eden_avail = eden_space()->capacity_in_bytes() - eden_alignment; | |
95 eden_avail = align_size_down(eden_avail, gen_alignment); | |
96 | |
97 assert(virtual_space()->committed_size() >= min_gen_size(), | |
98 "minimum gen size is wrong"); | |
99 size_t gen_avail = virtual_space()->committed_size() - min_gen_size(); | |
100 assert(virtual_space()->is_aligned(gen_avail), "not aligned"); | |
101 | |
102 const size_t max_contraction = MIN2(eden_avail, gen_avail); | |
103 // See comment for ASPSOldGen::available_for_contraction() | |
104 // for reasons the "increment" fraction is used. | |
105 PSAdaptiveSizePolicy* policy = heap->size_policy(); | |
106 size_t result = policy->eden_increment_aligned_down(max_contraction); | |
107 size_t result_aligned = align_size_down(result, gen_alignment); | |
108 if (PrintAdaptiveSizePolicy && Verbose) { | |
109 gclog_or_tty->print_cr("ASPSYoungGen::available_for_contraction: %d K", | |
110 result_aligned/K); | |
111 gclog_or_tty->print_cr(" max_contraction %d K", max_contraction/K); | |
112 gclog_or_tty->print_cr(" eden_avail %d K", eden_avail/K); | |
113 gclog_or_tty->print_cr(" gen_avail %d K", gen_avail/K); | |
114 } | |
115 return result_aligned; | |
116 | |
117 } | |
118 | |
119 return 0; | |
120 } | |
121 | |
122 // The current implementation only considers to the end of eden. | |
123 // If to_space is below from_space, to_space is not considered. | |
124 // to_space can be. | |
125 size_t ASPSYoungGen::available_to_live() { | |
126 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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127 const size_t alignment = heap->intra_heap_alignment(); |
0 | 128 |
129 // Include any space that is committed but is not in eden. | |
130 size_t available = pointer_delta(eden_space()->bottom(), | |
131 virtual_space()->low(), | |
132 sizeof(char)); | |
133 | |
134 const size_t eden_capacity = eden_space()->capacity_in_bytes(); | |
135 if (eden_space()->is_empty() && eden_capacity > alignment) { | |
136 available += eden_capacity - alignment; | |
137 } | |
138 return available; | |
139 } | |
140 | |
141 // Similar to PSYoungGen::resize_generation() but | |
142 // allows sum of eden_size and 2 * survivor_size to exceed _max_gen_size | |
143 // expands at the low end of the virtual space | |
144 // moves the boundary between the generations in order to expand | |
145 // some additional diagnostics | |
146 // If no additional changes are required, this can be deleted | |
147 // and the changes factored back into PSYoungGen::resize_generation(). | |
148 bool ASPSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { | |
149 const size_t alignment = virtual_space()->alignment(); | |
150 size_t orig_size = virtual_space()->committed_size(); | |
151 bool size_changed = false; | |
152 | |
153 // There used to be a guarantee here that | |
154 // (eden_size + 2*survivor_size) <= _max_gen_size | |
155 // This requirement is enforced by the calculation of desired_size | |
156 // below. It may not be true on entry since the size of the | |
157 // eden_size is no bounded by the generation size. | |
158 | |
159 assert(max_size() == reserved().byte_size(), "max gen size problem?"); | |
160 assert(min_gen_size() <= orig_size && orig_size <= max_size(), | |
161 "just checking"); | |
162 | |
163 // Adjust new generation size | |
164 const size_t eden_plus_survivors = | |
165 align_size_up(eden_size + 2 * survivor_size, alignment); | |
166 size_t desired_size = MAX2(MIN2(eden_plus_survivors, gen_size_limit()), | |
167 min_gen_size()); | |
168 assert(desired_size <= gen_size_limit(), "just checking"); | |
169 | |
170 if (desired_size > orig_size) { | |
171 // Grow the generation | |
172 size_t change = desired_size - orig_size; | |
173 if (!virtual_space()->expand_by(change)) { | |
174 return false; | |
175 } | |
176 size_changed = true; | |
177 } else if (desired_size < orig_size) { | |
178 size_t desired_change = orig_size - desired_size; | |
179 | |
180 // How much is available for shrinking. | |
181 size_t available_bytes = limit_gen_shrink(desired_change); | |
182 size_t change = MIN2(desired_change, available_bytes); | |
183 virtual_space()->shrink_by(change); | |
184 size_changed = true; | |
185 } else { | |
186 if (Verbose && PrintGC) { | |
187 if (orig_size == gen_size_limit()) { | |
188 gclog_or_tty->print_cr("ASPSYoung generation size at maximum: " | |
189 SIZE_FORMAT "K", orig_size/K); | |
190 } else if (orig_size == min_gen_size()) { | |
191 gclog_or_tty->print_cr("ASPSYoung generation size at minium: " | |
192 SIZE_FORMAT "K", orig_size/K); | |
193 } | |
194 } | |
195 } | |
196 | |
197 if (size_changed) { | |
198 reset_after_change(); | |
199 if (Verbose && PrintGC) { | |
200 size_t current_size = virtual_space()->committed_size(); | |
201 gclog_or_tty->print_cr("ASPSYoung generation size changed: " | |
202 SIZE_FORMAT "K->" SIZE_FORMAT "K", | |
203 orig_size/K, current_size/K); | |
204 } | |
205 } | |
206 | |
207 guarantee(eden_plus_survivors <= virtual_space()->committed_size() || | |
208 virtual_space()->committed_size() == max_size(), "Sanity"); | |
209 | |
210 return true; | |
211 } | |
212 | |
213 // Similar to PSYoungGen::resize_spaces() but | |
214 // eden always starts at the low end of the committed virtual space | |
215 // current implementation does not allow holes between the spaces | |
216 // _young_generation_boundary has to be reset because it changes. | |
217 // so additional verification | |
218 void ASPSYoungGen::resize_spaces(size_t requested_eden_size, | |
219 size_t requested_survivor_size) { | |
220 assert(requested_eden_size > 0 && requested_survivor_size > 0, | |
221 "just checking"); | |
222 | |
223 space_invariants(); | |
224 | |
225 // We require eden and to space to be empty | |
226 if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { | |
227 return; | |
228 } | |
229 | |
230 if (PrintAdaptiveSizePolicy && Verbose) { | |
231 gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " | |
232 SIZE_FORMAT | |
233 ", requested_survivor_size: " SIZE_FORMAT ")", | |
234 requested_eden_size, requested_survivor_size); | |
235 gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
236 SIZE_FORMAT, | |
237 eden_space()->bottom(), | |
238 eden_space()->end(), | |
239 pointer_delta(eden_space()->end(), | |
240 eden_space()->bottom(), | |
241 sizeof(char))); | |
242 gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
243 SIZE_FORMAT, | |
244 from_space()->bottom(), | |
245 from_space()->end(), | |
246 pointer_delta(from_space()->end(), | |
247 from_space()->bottom(), | |
248 sizeof(char))); | |
249 gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " | |
250 SIZE_FORMAT, | |
251 to_space()->bottom(), | |
252 to_space()->end(), | |
253 pointer_delta( to_space()->end(), | |
254 to_space()->bottom(), | |
255 sizeof(char))); | |
256 } | |
257 | |
258 // There's nothing to do if the new sizes are the same as the current | |
259 if (requested_survivor_size == to_space()->capacity_in_bytes() && | |
260 requested_survivor_size == from_space()->capacity_in_bytes() && | |
261 requested_eden_size == eden_space()->capacity_in_bytes()) { | |
262 if (PrintAdaptiveSizePolicy && Verbose) { | |
263 gclog_or_tty->print_cr(" capacities are the right sizes, returning"); | |
264 } | |
265 return; | |
266 } | |
267 | |
268 char* eden_start = (char*)virtual_space()->low(); | |
269 char* eden_end = (char*)eden_space()->end(); | |
270 char* from_start = (char*)from_space()->bottom(); | |
271 char* from_end = (char*)from_space()->end(); | |
272 char* to_start = (char*)to_space()->bottom(); | |
273 char* to_end = (char*)to_space()->end(); | |
274 | |
275 assert(eden_start < from_start, "Cannot push into from_space"); | |
276 | |
277 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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183f41cf8bfe
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
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diff
changeset
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278 const size_t alignment = heap->intra_heap_alignment(); |
0 | 279 |
280 // Check whether from space is below to space | |
281 if (from_start < to_start) { | |
282 // Eden, from, to | |
283 if (PrintAdaptiveSizePolicy && Verbose) { | |
284 gclog_or_tty->print_cr(" Eden, from, to:"); | |
285 } | |
286 | |
287 // Set eden | |
288 // Compute how big eden can be, then adjust end. | |
289 // See comment in PSYoungGen::resize_spaces() on | |
290 // calculating eden_end. | |
291 const size_t eden_size = MIN2(requested_eden_size, | |
292 pointer_delta(from_start, | |
293 eden_start, | |
294 sizeof(char))); | |
295 eden_end = eden_start + eden_size; | |
296 assert(eden_end >= eden_start, "addition overflowed") | |
297 | |
298 // To may resize into from space as long as it is clear of live data. | |
299 // From space must remain page aligned, though, so we need to do some | |
300 // extra calculations. | |
301 | |
302 // First calculate an optimal to-space | |
303 to_end = (char*)virtual_space()->high(); | |
304 to_start = (char*)pointer_delta(to_end, | |
305 (char*)requested_survivor_size, | |
306 sizeof(char)); | |
307 | |
308 // Does the optimal to-space overlap from-space? | |
309 if (to_start < (char*)from_space()->end()) { | |
310 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
311 | |
312 // Calculate the minimum offset possible for from_end | |
313 size_t from_size = | |
314 pointer_delta(from_space()->top(), from_start, sizeof(char)); | |
315 | |
316 // Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! | |
317 if (from_size == 0) { | |
318 from_size = alignment; | |
319 } else { | |
320 from_size = align_size_up(from_size, alignment); | |
321 } | |
322 | |
323 from_end = from_start + from_size; | |
324 assert(from_end > from_start, "addition overflow or from_size problem"); | |
325 | |
326 guarantee(from_end <= (char*)from_space()->end(), | |
327 "from_end moved to the right"); | |
328 | |
329 // Now update to_start with the new from_end | |
330 to_start = MAX2(from_end, to_start); | |
331 } | |
332 | |
333 guarantee(to_start != to_end, "to space is zero sized"); | |
334 | |
335 if (PrintAdaptiveSizePolicy && Verbose) { | |
336 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
337 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
338 eden_start, | |
339 eden_end, | |
340 pointer_delta(eden_end, eden_start, sizeof(char))); | |
341 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
342 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
343 from_start, | |
344 from_end, | |
345 pointer_delta(from_end, from_start, sizeof(char))); | |
346 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
347 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
348 to_start, | |
349 to_end, | |
350 pointer_delta( to_end, to_start, sizeof(char))); | |
351 } | |
352 } else { | |
353 // Eden, to, from | |
354 if (PrintAdaptiveSizePolicy && Verbose) { | |
355 gclog_or_tty->print_cr(" Eden, to, from:"); | |
356 } | |
357 | |
358 // To space gets priority over eden resizing. Note that we position | |
359 // to space as if we were able to resize from space, even though from | |
360 // space is not modified. | |
361 // Giving eden priority was tried and gave poorer performance. | |
362 to_end = (char*)pointer_delta(virtual_space()->high(), | |
363 (char*)requested_survivor_size, | |
364 sizeof(char)); | |
365 to_end = MIN2(to_end, from_start); | |
366 to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, | |
367 sizeof(char)); | |
368 // if the space sizes are to be increased by several times then | |
369 // 'to_start' will point beyond the young generation. In this case | |
370 // 'to_start' should be adjusted. | |
371 to_start = MAX2(to_start, eden_start + alignment); | |
372 | |
373 // Compute how big eden can be, then adjust end. | |
374 // See comment in PSYoungGen::resize_spaces() on | |
375 // calculating eden_end. | |
376 const size_t eden_size = MIN2(requested_eden_size, | |
377 pointer_delta(to_start, | |
378 eden_start, | |
379 sizeof(char))); | |
380 eden_end = eden_start + eden_size; | |
381 assert(eden_end >= eden_start, "addition overflowed") | |
382 | |
383 // Don't let eden shrink down to 0 or less. | |
384 eden_end = MAX2(eden_end, eden_start + alignment); | |
385 to_start = MAX2(to_start, eden_end); | |
386 | |
387 if (PrintAdaptiveSizePolicy && Verbose) { | |
388 gclog_or_tty->print_cr(" [eden_start .. eden_end): " | |
389 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
390 eden_start, | |
391 eden_end, | |
392 pointer_delta(eden_end, eden_start, sizeof(char))); | |
393 gclog_or_tty->print_cr(" [ to_start .. to_end): " | |
394 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
395 to_start, | |
396 to_end, | |
397 pointer_delta( to_end, to_start, sizeof(char))); | |
398 gclog_or_tty->print_cr(" [from_start .. from_end): " | |
399 "[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, | |
400 from_start, | |
401 from_end, | |
402 pointer_delta(from_end, from_start, sizeof(char))); | |
403 } | |
404 } | |
405 | |
406 | |
407 guarantee((HeapWord*)from_start <= from_space()->bottom(), | |
408 "from start moved to the right"); | |
409 guarantee((HeapWord*)from_end >= from_space()->top(), | |
410 "from end moved into live data"); | |
411 assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); | |
412 assert(is_object_aligned((intptr_t)from_start), "checking alignment"); | |
413 assert(is_object_aligned((intptr_t)to_start), "checking alignment"); | |
414 | |
415 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); | |
416 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
417 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); | |
418 | |
419 // Let's make sure the call to initialize doesn't reset "top"! | |
420 DEBUG_ONLY(HeapWord* old_from_top = from_space()->top();) | |
421 | |
422 // For PrintAdaptiveSizePolicy block below | |
423 size_t old_from = from_space()->capacity_in_bytes(); | |
424 size_t old_to = to_space()->capacity_in_bytes(); | |
425 | |
426 eden_space()->initialize(edenMR, true); | |
427 to_space()->initialize(toMR , true); | |
428 from_space()->initialize(fromMR, false); // Note, not cleared! | |
429 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); | |
430 | |
431 assert(from_space()->top() == old_from_top, "from top changed!"); | |
432 | |
433 if (PrintAdaptiveSizePolicy) { | |
434 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
435 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
436 | |
437 gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " | |
438 "collection: %d " | |
439 "(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " | |
440 "(" SIZE_FORMAT ", " SIZE_FORMAT ") ", | |
441 heap->total_collections(), | |
442 old_from, old_to, | |
443 from_space()->capacity_in_bytes(), | |
444 to_space()->capacity_in_bytes()); | |
445 gclog_or_tty->cr(); | |
446 } | |
447 space_invariants(); | |
448 } | |
449 | |
450 void ASPSYoungGen::reset_after_change() { | |
451 assert_locked_or_safepoint(Heap_lock); | |
452 | |
453 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
454 (HeapWord*)virtual_space()->high_boundary()); | |
455 PSScavenge::reference_processor()->set_span(_reserved); | |
456 | |
457 HeapWord* new_eden_bottom = (HeapWord*)virtual_space()->low(); | |
458 HeapWord* eden_bottom = eden_space()->bottom(); | |
459 if (new_eden_bottom != eden_bottom) { | |
460 MemRegion eden_mr(new_eden_bottom, eden_space()->end()); | |
461 eden_space()->initialize(eden_mr, true); | |
462 PSScavenge::set_young_generation_boundary(eden_space()->bottom()); | |
463 } | |
464 MemRegion cmr((HeapWord*)virtual_space()->low(), | |
465 (HeapWord*)virtual_space()->high()); | |
466 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
467 | |
468 space_invariants(); | |
469 } |