Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/collectionSetChooser.cpp @ 4709:fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
Summary: Cache workers' calculated starting heap region, used for parallel iteration over the collcection set, for subsequent reuse.
Reviewed-by: tonyp, brutisso
author | johnc |
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date | Wed, 14 Dec 2011 17:43:55 -0800 |
parents | bca17e38de00 |
children | 441e946dc1af |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/collectionSetChooser.hpp" | |
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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29 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 30 #include "memory/space.inline.hpp" |
342 | 31 |
32 CSetChooserCache::CSetChooserCache() { | |
33 for (int i = 0; i < CacheLength; ++i) | |
34 _cache[i] = NULL; | |
35 clear(); | |
36 } | |
37 | |
38 void CSetChooserCache::clear() { | |
39 _occupancy = 0; | |
40 _first = 0; | |
41 for (int i = 0; i < CacheLength; ++i) { | |
42 HeapRegion *hr = _cache[i]; | |
43 if (hr != NULL) | |
44 hr->set_sort_index(-1); | |
45 _cache[i] = NULL; | |
46 } | |
47 } | |
48 | |
49 #ifndef PRODUCT | |
50 bool CSetChooserCache::verify() { | |
51 int index = _first; | |
52 HeapRegion *prev = NULL; | |
53 for (int i = 0; i < _occupancy; ++i) { | |
54 guarantee(_cache[index] != NULL, "cache entry should not be empty"); | |
55 HeapRegion *hr = _cache[index]; | |
56 guarantee(!hr->is_young(), "should not be young!"); | |
57 if (prev != NULL) { | |
58 guarantee(prev->gc_efficiency() >= hr->gc_efficiency(), | |
59 "cache should be correctly ordered"); | |
60 } | |
61 guarantee(hr->sort_index() == get_sort_index(index), | |
62 "sort index should be correct"); | |
63 index = trim_index(index + 1); | |
64 prev = hr; | |
65 } | |
66 | |
67 for (int i = 0; i < (CacheLength - _occupancy); ++i) { | |
68 guarantee(_cache[index] == NULL, "cache entry should be empty"); | |
69 index = trim_index(index + 1); | |
70 } | |
71 | |
72 guarantee(index == _first, "we should have reached where we started from"); | |
73 return true; | |
74 } | |
75 #endif // PRODUCT | |
76 | |
77 void CSetChooserCache::insert(HeapRegion *hr) { | |
78 assert(!is_full(), "cache should not be empty"); | |
79 hr->calc_gc_efficiency(); | |
80 | |
81 int empty_index; | |
82 if (_occupancy == 0) { | |
83 empty_index = _first; | |
84 } else { | |
85 empty_index = trim_index(_first + _occupancy); | |
86 assert(_cache[empty_index] == NULL, "last slot should be empty"); | |
87 int last_index = trim_index(empty_index - 1); | |
88 HeapRegion *last = _cache[last_index]; | |
89 assert(last != NULL,"as the cache is not empty, last should not be empty"); | |
90 while (empty_index != _first && | |
91 last->gc_efficiency() < hr->gc_efficiency()) { | |
92 _cache[empty_index] = last; | |
93 last->set_sort_index(get_sort_index(empty_index)); | |
94 empty_index = last_index; | |
95 last_index = trim_index(last_index - 1); | |
96 last = _cache[last_index]; | |
97 } | |
98 } | |
99 _cache[empty_index] = hr; | |
100 hr->set_sort_index(get_sort_index(empty_index)); | |
101 | |
102 ++_occupancy; | |
103 assert(verify(), "cache should be consistent"); | |
104 } | |
105 | |
106 HeapRegion *CSetChooserCache::remove_first() { | |
107 if (_occupancy > 0) { | |
108 assert(_cache[_first] != NULL, "cache should have at least one region"); | |
109 HeapRegion *ret = _cache[_first]; | |
110 _cache[_first] = NULL; | |
111 ret->set_sort_index(-1); | |
112 --_occupancy; | |
113 _first = trim_index(_first + 1); | |
114 assert(verify(), "cache should be consistent"); | |
115 return ret; | |
116 } else { | |
117 return NULL; | |
118 } | |
119 } | |
120 | |
121 static inline int orderRegions(HeapRegion* hr1, HeapRegion* hr2) { | |
122 if (hr1 == NULL) { | |
123 if (hr2 == NULL) return 0; | |
124 else return 1; | |
125 } else if (hr2 == NULL) { | |
126 return -1; | |
127 } | |
128 if (hr2->gc_efficiency() < hr1->gc_efficiency()) return -1; | |
129 else if (hr1->gc_efficiency() < hr2->gc_efficiency()) return 1; | |
130 else return 0; | |
131 } | |
132 | |
133 static int orderRegions(HeapRegion** hr1p, HeapRegion** hr2p) { | |
134 return orderRegions(*hr1p, *hr2p); | |
135 } | |
136 | |
137 CollectionSetChooser::CollectionSetChooser() : | |
138 // The line below is the worst bit of C++ hackery I've ever written | |
139 // (Detlefs, 11/23). You should think of it as equivalent to | |
140 // "_regions(100, true)": initialize the growable array and inform it | |
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141 // that it should allocate its elem array(s) on the C heap. |
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142 // |
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143 // The first argument, however, is actually a comma expression |
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144 // (set_allocation_type(this, C_HEAP), 100). The purpose of the |
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145 // set_allocation_type() call is to replace the default allocation |
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146 // type for embedded objects STACK_OR_EMBEDDED with C_HEAP. It will |
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147 // allow to pass the assert in GenericGrowableArray() which checks |
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148 // that a growable array object must be on C heap if elements are. |
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149 // |
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150 // Note: containing object is allocated on C heap since it is CHeapObj. |
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151 // |
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152 _markedRegions((ResourceObj::set_allocation_type((address)&_markedRegions, |
342 | 153 ResourceObj::C_HEAP), |
154 100), | |
155 true), | |
156 _curMarkedIndex(0), | |
157 _numMarkedRegions(0), | |
158 _unmarked_age_1_returned_as_new(false), | |
159 _first_par_unreserved_idx(0) | |
160 {} | |
161 | |
162 | |
163 | |
164 #ifndef PRODUCT | |
165 bool CollectionSetChooser::verify() { | |
166 int index = 0; | |
167 guarantee(_curMarkedIndex <= _numMarkedRegions, | |
168 "_curMarkedIndex should be within bounds"); | |
169 while (index < _curMarkedIndex) { | |
170 guarantee(_markedRegions.at(index++) == NULL, | |
171 "all entries before _curMarkedIndex should be NULL"); | |
172 } | |
173 HeapRegion *prev = NULL; | |
174 while (index < _numMarkedRegions) { | |
175 HeapRegion *curr = _markedRegions.at(index++); | |
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176 guarantee(curr != NULL, "Regions in _markedRegions array cannot be NULL"); |
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177 int si = curr->sort_index(); |
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178 guarantee(!curr->is_young(), "should not be young!"); |
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179 guarantee(si > -1 && si == (index-1), "sort index invariant"); |
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180 if (prev != NULL) { |
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181 guarantee(orderRegions(prev, curr) != 1, "regions should be sorted"); |
342 | 182 } |
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183 prev = curr; |
342 | 184 } |
185 return _cache.verify(); | |
186 } | |
187 #endif | |
188 | |
189 void | |
190 CollectionSetChooser::fillCache() { | |
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191 while (!_cache.is_full() && (_curMarkedIndex < _numMarkedRegions)) { |
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192 HeapRegion* hr = _markedRegions.at(_curMarkedIndex); |
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193 assert(hr != NULL, |
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194 err_msg("Unexpected NULL hr in _markedRegions at index %d", |
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195 _curMarkedIndex)); |
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196 _curMarkedIndex += 1; |
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197 assert(!hr->is_young(), "should not be young!"); |
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198 assert(hr->sort_index() == _curMarkedIndex-1, "sort_index invariant"); |
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199 _markedRegions.at_put(hr->sort_index(), NULL); |
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200 _cache.insert(hr); |
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201 assert(!_cache.is_empty(), "cache should not be empty"); |
342 | 202 } |
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203 assert(verify(), "cache should be consistent"); |
342 | 204 } |
205 | |
206 void | |
207 CollectionSetChooser::sortMarkedHeapRegions() { | |
208 guarantee(_cache.is_empty(), "cache should be empty"); | |
209 // First trim any unused portion of the top in the parallel case. | |
210 if (_first_par_unreserved_idx > 0) { | |
211 if (G1PrintParCleanupStats) { | |
212 gclog_or_tty->print(" Truncating _markedRegions from %d to %d.\n", | |
213 _markedRegions.length(), _first_par_unreserved_idx); | |
214 } | |
215 assert(_first_par_unreserved_idx <= _markedRegions.length(), | |
216 "Or we didn't reserved enough length"); | |
217 _markedRegions.trunc_to(_first_par_unreserved_idx); | |
218 } | |
219 _markedRegions.sort(orderRegions); | |
220 assert(_numMarkedRegions <= _markedRegions.length(), "Requirement"); | |
221 assert(_numMarkedRegions == 0 | |
222 || _markedRegions.at(_numMarkedRegions-1) != NULL, | |
223 "Testing _numMarkedRegions"); | |
224 assert(_numMarkedRegions == _markedRegions.length() | |
225 || _markedRegions.at(_numMarkedRegions) == NULL, | |
226 "Testing _numMarkedRegions"); | |
227 if (G1PrintParCleanupStats) { | |
228 gclog_or_tty->print_cr(" Sorted %d marked regions.", _numMarkedRegions); | |
229 } | |
230 for (int i = 0; i < _numMarkedRegions; i++) { | |
231 assert(_markedRegions.at(i) != NULL, "Should be true by sorting!"); | |
232 _markedRegions.at(i)->set_sort_index(i); | |
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233 } |
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234 if (G1PrintRegionLivenessInfo) { |
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235 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Sorting"); |
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236 for (int i = 0; i < _numMarkedRegions; ++i) { |
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237 HeapRegion* r = _markedRegions.at(i); |
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238 cl.doHeapRegion(r); |
342 | 239 } |
240 } | |
241 assert(verify(), "should now be sorted"); | |
242 } | |
243 | |
244 void | |
245 CollectionSetChooser::addMarkedHeapRegion(HeapRegion* hr) { | |
246 assert(!hr->isHumongous(), | |
247 "Humongous regions shouldn't be added to the collection set"); | |
248 assert(!hr->is_young(), "should not be young!"); | |
249 _markedRegions.append(hr); | |
250 _numMarkedRegions++; | |
251 hr->calc_gc_efficiency(); | |
252 } | |
253 | |
254 void | |
255 CollectionSetChooser:: | |
256 prepareForAddMarkedHeapRegionsPar(size_t n_regions, size_t chunkSize) { | |
257 _first_par_unreserved_idx = 0; | |
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258 int n_threads = ParallelGCThreads; |
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259 if (UseDynamicNumberOfGCThreads) { |
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260 assert(G1CollectedHeap::heap()->workers()->active_workers() > 0, |
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261 "Should have been set earlier"); |
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262 // This is defensive code. As the assertion above says, the number |
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263 // of active threads should be > 0, but in case there is some path |
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264 // or some improperly initialized variable with leads to no |
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265 // active threads, protect against that in a product build. |
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266 n_threads = MAX2(G1CollectedHeap::heap()->workers()->active_workers(), |
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267 1); |
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268 } |
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269 size_t max_waste = n_threads * chunkSize; |
342 | 270 // it should be aligned with respect to chunkSize |
271 size_t aligned_n_regions = | |
272 (n_regions + (chunkSize - 1)) / chunkSize * chunkSize; | |
273 assert( aligned_n_regions % chunkSize == 0, "should be aligned" ); | |
274 _markedRegions.at_put_grow((int)(aligned_n_regions + max_waste - 1), NULL); | |
275 } | |
276 | |
277 jint | |
278 CollectionSetChooser::getParMarkedHeapRegionChunk(jint n_regions) { | |
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279 // Don't do this assert because this can be called at a point |
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280 // where the loop up stream will not execute again but might |
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281 // try to claim more chunks (loop test has not been done yet). |
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282 // assert(_markedRegions.length() > _first_par_unreserved_idx, |
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283 // "Striding beyond the marked regions"); |
342 | 284 jint res = Atomic::add(n_regions, &_first_par_unreserved_idx); |
285 assert(_markedRegions.length() > res + n_regions - 1, | |
286 "Should already have been expanded"); | |
287 return res - n_regions; | |
288 } | |
289 | |
290 void | |
291 CollectionSetChooser::setMarkedHeapRegion(jint index, HeapRegion* hr) { | |
292 assert(_markedRegions.at(index) == NULL, "precondition"); | |
293 assert(!hr->is_young(), "should not be young!"); | |
294 _markedRegions.at_put(index, hr); | |
295 hr->calc_gc_efficiency(); | |
296 } | |
297 | |
298 void | |
299 CollectionSetChooser::incNumMarkedHeapRegions(jint inc_by) { | |
300 (void)Atomic::add(inc_by, &_numMarkedRegions); | |
301 } | |
302 | |
303 void | |
304 CollectionSetChooser::clearMarkedHeapRegions(){ | |
305 for (int i = 0; i < _markedRegions.length(); i++) { | |
306 HeapRegion* r = _markedRegions.at(i); | |
307 if (r != NULL) r->set_sort_index(-1); | |
308 } | |
309 _markedRegions.clear(); | |
310 _curMarkedIndex = 0; | |
311 _numMarkedRegions = 0; | |
312 _cache.clear(); | |
313 }; | |
314 | |
315 void | |
316 CollectionSetChooser::updateAfterFullCollection() { | |
317 clearMarkedHeapRegions(); | |
318 } | |
319 | |
320 // if time_remaining < 0.0, then this method should try to return | |
321 // a region, whether it fits within the remaining time or not | |
322 HeapRegion* | |
323 CollectionSetChooser::getNextMarkedRegion(double time_remaining, | |
324 double avg_prediction) { | |
325 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
326 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
327 fillCache(); | |
328 if (_cache.is_empty()) { | |
329 assert(_curMarkedIndex == _numMarkedRegions, | |
330 "if cache is empty, list should also be empty"); | |
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331 ergo_verbose0(ErgoCSetConstruction, |
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332 "stop adding old regions to CSet", |
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333 ergo_format_reason("cache is empty")); |
342 | 334 return NULL; |
335 } | |
336 | |
337 HeapRegion *hr = _cache.get_first(); | |
338 assert(hr != NULL, "if cache not empty, first entry should be non-null"); | |
339 double predicted_time = g1h->predict_region_elapsed_time_ms(hr, false); | |
340 | |
341 if (g1p->adaptive_young_list_length()) { | |
342 if (time_remaining - predicted_time < 0.0) { | |
343 g1h->check_if_region_is_too_expensive(predicted_time); | |
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344 ergo_verbose2(ErgoCSetConstruction, |
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345 "stop adding old regions to CSet", |
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346 ergo_format_reason("predicted old region time higher than remaining time") |
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347 ergo_format_ms("predicted old region time") |
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348 ergo_format_ms("remaining time"), |
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349 predicted_time, time_remaining); |
342 | 350 return NULL; |
351 } | |
352 } else { | |
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353 double threshold = 2.0 * avg_prediction; |
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354 if (predicted_time > threshold) { |
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355 ergo_verbose2(ErgoCSetConstruction, |
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356 "stop adding old regions to CSet", |
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357 ergo_format_reason("predicted old region time higher than threshold") |
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358 ergo_format_ms("predicted old region time") |
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359 ergo_format_ms("threshold"), |
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360 predicted_time, threshold); |
342 | 361 return NULL; |
362 } | |
363 } | |
364 | |
365 HeapRegion *hr2 = _cache.remove_first(); | |
366 assert(hr == hr2, "cache contents should not have changed"); | |
367 | |
368 return hr; | |
369 } |