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1 /*
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2 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_permGen.cpp.incl"
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27
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28 CompactingPermGen::CompactingPermGen(ReservedSpace rs,
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29 ReservedSpace shared_rs,
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30 size_t initial_byte_size,
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31 GenRemSet* remset,
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32 PermanentGenerationSpec* perm_spec)
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33 {
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34 CompactingPermGenGen* g =
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35 new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset,
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36 NULL, perm_spec);
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37 if (g == NULL)
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38 vm_exit_during_initialization("Could not allocate a CompactingPermGen");
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39 _gen = g;
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40
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41 g->initialize_performance_counters();
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42
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43 _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion;
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44 }
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45
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46 HeapWord* CompactingPermGen::mem_allocate(size_t size) {
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47 MutexLocker ml(Heap_lock);
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48 HeapWord* obj = _gen->allocate(size, false);
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49 bool tried_collection = false;
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50 bool tried_expansion = false;
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51 while (obj == NULL) {
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52 if (_gen->capacity() >= _capacity_expansion_limit || tried_expansion) {
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53 // Expansion limit reached, try collection before expanding further
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54 // For now we force a full collection, this could be changed
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55 SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
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56 obj = _gen->allocate(size, false);
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57 tried_collection = true;
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58 tried_expansion = false; // ... following the collection:
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59 // the collection may have shrunk the space.
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60 }
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61 if (obj == NULL && !tried_expansion) {
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62 obj = _gen->expand_and_allocate(size, false);
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63 tried_expansion = true;
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64 }
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65 if (obj == NULL && tried_collection && tried_expansion) {
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66 // We have not been able to allocate despite a collection and
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67 // an attempted space expansion. We now make a last-ditch collection
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68 // attempt that will try to reclaim as much space as possible (for
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69 // example by aggressively clearing all soft refs).
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70 SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
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71 obj = _gen->allocate(size, false);
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72 if (obj == NULL) {
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73 // An expansion attempt is necessary since the previous
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74 // collection may have shrunk the space.
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75 obj = _gen->expand_and_allocate(size, false);
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76 }
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77 break;
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78 }
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79 }
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80 return obj;
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81 }
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82
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83 void CompactingPermGen::compute_new_size() {
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84 size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion);
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85 if (desired_capacity < PermSize) {
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86 desired_capacity = PermSize;
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87 }
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88 if (_gen->capacity() > desired_capacity) {
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89 _gen->shrink(_gen->capacity() - desired_capacity);
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90 }
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91 _capacity_expansion_limit = _gen->capacity() + MaxPermHeapExpansion;
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92 }
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