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annotate src/share/vm/gc_implementation/g1/heapRegionSeq.cpp @ 3403:7db2b9499c36
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Reviewed-by: kvn, iveresov, jrose
author | never |
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date | Wed, 25 May 2011 16:04:09 -0700 |
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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/g1CollectedHeap.inline.hpp" | |
27 #include "gc_implementation/g1/heapRegionSeq.hpp" | |
28 #include "memory/allocation.hpp" | |
342 | 29 |
30 // Local to this file. | |
31 | |
32 static int orderRegions(HeapRegion** hr1p, HeapRegion** hr2p) { | |
33 if ((*hr1p)->end() <= (*hr2p)->bottom()) return -1; | |
34 else if ((*hr2p)->end() <= (*hr1p)->bottom()) return 1; | |
35 else if (*hr1p == *hr2p) return 0; | |
36 else { | |
37 assert(false, "We should never compare distinct overlapping regions."); | |
38 } | |
39 return 0; | |
40 } | |
41 | |
393 | 42 HeapRegionSeq::HeapRegionSeq(const size_t max_size) : |
342 | 43 _alloc_search_start(0), |
44 // The line below is the worst bit of C++ hackery I've ever written | |
45 // (Detlefs, 11/23). You should think of it as equivalent to | |
46 // "_regions(100, true)": initialize the growable array and inform it | |
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47 // that it should allocate its elem array(s) on the C heap. |
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48 // |
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49 // The first argument, however, is actually a comma expression |
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50 // (set_allocation_type(this, C_HEAP), 100). The purpose of the |
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51 // set_allocation_type() call is to replace the default allocation |
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52 // type for embedded objects STACK_OR_EMBEDDED with C_HEAP. It will |
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53 // allow to pass the assert in GenericGrowableArray() which checks |
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54 // that a growable array object must be on C heap if elements are. |
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55 // |
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56 // Note: containing object is allocated on C heap since it is CHeapObj. |
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57 // |
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58 _regions((ResourceObj::set_allocation_type((address)&_regions, |
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59 ResourceObj::C_HEAP), |
393 | 60 (int)max_size), |
342 | 61 true), |
62 _next_rr_candidate(0), | |
63 _seq_bottom(NULL) | |
64 {} | |
65 | |
66 // Private methods. | |
67 | |
677 | 68 void HeapRegionSeq::print_empty_runs() { |
342 | 69 int empty_run = 0; |
70 int n_empty = 0; | |
71 int empty_run_start; | |
72 for (int i = 0; i < _regions.length(); i++) { | |
73 HeapRegion* r = _regions.at(i); | |
74 if (r->continuesHumongous()) continue; | |
677 | 75 if (r->is_empty()) { |
342 | 76 assert(!r->isHumongous(), "H regions should not be empty."); |
77 if (empty_run == 0) empty_run_start = i; | |
78 empty_run++; | |
79 n_empty++; | |
80 } else { | |
81 if (empty_run > 0) { | |
82 gclog_or_tty->print(" %d:%d", empty_run_start, empty_run); | |
83 empty_run = 0; | |
84 } | |
85 } | |
86 } | |
87 if (empty_run > 0) { | |
88 gclog_or_tty->print(" %d:%d", empty_run_start, empty_run); | |
89 } | |
90 gclog_or_tty->print_cr(" [tot = %d]", n_empty); | |
91 } | |
92 | |
93 int HeapRegionSeq::find(HeapRegion* hr) { | |
94 // FIXME: optimized for adjacent regions of fixed size. | |
95 int ind = hr->hrs_index(); | |
96 if (ind != -1) { | |
97 assert(_regions.at(ind) == hr, "Mismatch"); | |
98 } | |
99 return ind; | |
100 } | |
101 | |
102 | |
103 // Public methods. | |
104 | |
105 void HeapRegionSeq::insert(HeapRegion* hr) { | |
393 | 106 assert(!_regions.is_full(), "Too many elements in HeapRegionSeq"); |
342 | 107 if (_regions.length() == 0 |
108 || _regions.top()->end() <= hr->bottom()) { | |
109 hr->set_hrs_index(_regions.length()); | |
110 _regions.append(hr); | |
111 } else { | |
112 _regions.append(hr); | |
113 _regions.sort(orderRegions); | |
114 for (int i = 0; i < _regions.length(); i++) { | |
115 _regions.at(i)->set_hrs_index(i); | |
116 } | |
117 } | |
118 char* bot = (char*)_regions.at(0)->bottom(); | |
119 if (_seq_bottom == NULL || bot < _seq_bottom) _seq_bottom = bot; | |
120 } | |
121 | |
122 size_t HeapRegionSeq::length() { | |
123 return _regions.length(); | |
124 } | |
125 | |
126 size_t HeapRegionSeq::free_suffix() { | |
127 size_t res = 0; | |
128 int first = _regions.length() - 1; | |
129 int cur = first; | |
130 while (cur >= 0 && | |
131 (_regions.at(cur)->is_empty() | |
132 && (first == cur | |
133 || (_regions.at(cur+1)->bottom() == | |
134 _regions.at(cur)->end())))) { | |
135 res++; | |
136 cur--; | |
137 } | |
138 return res; | |
139 } | |
140 | |
2152 | 141 int HeapRegionSeq::find_contiguous_from(int from, size_t num) { |
142 assert(num > 1, "pre-condition"); | |
143 assert(0 <= from && from <= _regions.length(), | |
144 err_msg("from: %d should be valid and <= than %d", | |
145 from, _regions.length())); | |
146 | |
147 int curr = from; | |
148 int first = -1; | |
149 size_t num_so_far = 0; | |
150 while (curr < _regions.length() && num_so_far < num) { | |
151 HeapRegion* curr_hr = _regions.at(curr); | |
152 if (curr_hr->is_empty()) { | |
153 if (first == -1) { | |
154 first = curr; | |
155 num_so_far = 1; | |
156 } else { | |
157 num_so_far += 1; | |
158 } | |
159 } else { | |
160 first = -1; | |
161 num_so_far = 0; | |
162 } | |
163 curr += 1; | |
164 } | |
165 | |
166 assert(num_so_far <= num, "post-condition"); | |
167 if (num_so_far == num) { | |
2361 | 168 // we found enough space for the humongous object |
2152 | 169 assert(from <= first && first < _regions.length(), "post-condition"); |
170 assert(first < curr && (curr - first) == (int) num, "post-condition"); | |
171 for (int i = first; i < first + (int) num; ++i) { | |
172 assert(_regions.at(i)->is_empty(), "post-condition"); | |
173 } | |
174 return first; | |
175 } else { | |
176 // we failed to find enough space for the humongous object | |
177 return -1; | |
178 } | |
179 } | |
180 | |
181 int HeapRegionSeq::find_contiguous(size_t num) { | |
182 assert(num > 1, "otherwise we should not be calling this"); | |
183 assert(0 <= _alloc_search_start && _alloc_search_start <= _regions.length(), | |
184 err_msg("_alloc_search_start: %d should be valid and <= than %d", | |
185 _alloc_search_start, _regions.length())); | |
186 | |
187 int start = _alloc_search_start; | |
188 int res = find_contiguous_from(start, num); | |
189 if (res == -1 && start != 0) { | |
190 // Try starting from the beginning. If _alloc_search_start was 0, | |
191 // no point in doing this again. | |
192 res = find_contiguous_from(0, num); | |
193 } | |
194 if (res != -1) { | |
195 assert(0 <= res && res < _regions.length(), | |
196 err_msg("res: %d should be valid", res)); | |
197 _alloc_search_start = res + (int) num; | |
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198 assert(0 < _alloc_search_start && _alloc_search_start <= _regions.length(), |
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199 err_msg("_alloc_search_start: %d should be valid", |
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200 _alloc_search_start)); |
2152 | 201 } |
342 | 202 return res; |
203 } | |
204 | |
205 void HeapRegionSeq::iterate(HeapRegionClosure* blk) { | |
206 iterate_from((HeapRegion*)NULL, blk); | |
207 } | |
208 | |
209 // The first argument r is the heap region at which iteration begins. | |
210 // This operation runs fastest when r is NULL, or the heap region for | |
211 // which a HeapRegionClosure most recently returned true, or the | |
212 // heap region immediately to its right in the sequence. In all | |
213 // other cases a linear search is required to find the index of r. | |
214 | |
215 void HeapRegionSeq::iterate_from(HeapRegion* r, HeapRegionClosure* blk) { | |
216 | |
217 // :::: FIXME :::: | |
218 // Static cache value is bad, especially when we start doing parallel | |
219 // remembered set update. For now just don't cache anything (the | |
220 // code in the def'd out blocks). | |
221 | |
222 #if 0 | |
223 static int cached_j = 0; | |
224 #endif | |
225 int len = _regions.length(); | |
226 int j = 0; | |
227 // Find the index of r. | |
228 if (r != NULL) { | |
229 #if 0 | |
230 assert(cached_j >= 0, "Invariant."); | |
231 if ((cached_j < len) && (r == _regions.at(cached_j))) { | |
232 j = cached_j; | |
233 } else if ((cached_j + 1 < len) && (r == _regions.at(cached_j + 1))) { | |
234 j = cached_j + 1; | |
235 } else { | |
236 j = find(r); | |
237 #endif | |
238 if (j < 0) { | |
239 j = 0; | |
240 } | |
241 #if 0 | |
242 } | |
243 #endif | |
244 } | |
245 int i; | |
246 for (i = j; i < len; i += 1) { | |
247 int res = blk->doHeapRegion(_regions.at(i)); | |
248 if (res) { | |
249 #if 0 | |
250 cached_j = i; | |
251 #endif | |
252 blk->incomplete(); | |
253 return; | |
254 } | |
255 } | |
256 for (i = 0; i < j; i += 1) { | |
257 int res = blk->doHeapRegion(_regions.at(i)); | |
258 if (res) { | |
259 #if 0 | |
260 cached_j = i; | |
261 #endif | |
262 blk->incomplete(); | |
263 return; | |
264 } | |
265 } | |
266 } | |
267 | |
268 void HeapRegionSeq::iterate_from(int idx, HeapRegionClosure* blk) { | |
269 int len = _regions.length(); | |
270 int i; | |
271 for (i = idx; i < len; i++) { | |
272 if (blk->doHeapRegion(_regions.at(i))) { | |
273 blk->incomplete(); | |
274 return; | |
275 } | |
276 } | |
277 for (i = 0; i < idx; i++) { | |
278 if (blk->doHeapRegion(_regions.at(i))) { | |
279 blk->incomplete(); | |
280 return; | |
281 } | |
282 } | |
283 } | |
284 | |
285 MemRegion HeapRegionSeq::shrink_by(size_t shrink_bytes, | |
286 size_t& num_regions_deleted) { | |
2152 | 287 // Reset this in case it's currently pointing into the regions that |
288 // we just removed. | |
289 _alloc_search_start = 0; | |
290 | |
342 | 291 assert(shrink_bytes % os::vm_page_size() == 0, "unaligned"); |
292 assert(shrink_bytes % HeapRegion::GrainBytes == 0, "unaligned"); | |
293 | |
294 if (_regions.length() == 0) { | |
295 num_regions_deleted = 0; | |
296 return MemRegion(); | |
297 } | |
298 int j = _regions.length() - 1; | |
299 HeapWord* end = _regions.at(j)->end(); | |
300 HeapWord* last_start = end; | |
301 while (j >= 0 && shrink_bytes > 0) { | |
302 HeapRegion* cur = _regions.at(j); | |
303 // We have to leave humongous regions where they are, | |
304 // and work around them. | |
305 if (cur->isHumongous()) { | |
306 return MemRegion(last_start, end); | |
307 } | |
308 assert(cur == _regions.top(), "Should be top"); | |
309 if (!cur->is_empty()) break; | |
310 shrink_bytes -= cur->capacity(); | |
311 num_regions_deleted++; | |
312 _regions.pop(); | |
313 last_start = cur->bottom(); | |
314 // We need to delete these somehow, but can't currently do so here: if | |
315 // we do, the ZF thread may still access the deleted region. We'll | |
316 // leave this here as a reminder that we have to do something about | |
317 // this. | |
318 // delete cur; | |
319 j--; | |
320 } | |
321 return MemRegion(last_start, end); | |
322 } | |
323 | |
324 class PrintHeapRegionClosure : public HeapRegionClosure { | |
325 public: | |
326 bool doHeapRegion(HeapRegion* r) { | |
327 gclog_or_tty->print(PTR_FORMAT ":", r); | |
328 r->print(); | |
329 return false; | |
330 } | |
331 }; | |
332 | |
333 void HeapRegionSeq::print() { | |
334 PrintHeapRegionClosure cl; | |
335 iterate(&cl); | |
336 } |