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1 /*
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2 * Copyright (c) 2007 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/_cmsPermGen.cpp.incl"
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27
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28 CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
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29 CardTableRS* ct,
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30 FreeBlockDictionary::DictionaryChoice dictionaryChoice) {
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31 CMSPermGenGen* g =
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32 new CMSPermGenGen(rs, initial_byte_size, -1, ct);
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33 if (g == NULL) {
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34 vm_exit_during_initialization("Could not allocate a CompactingPermGen");
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35 }
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36
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37 g->initialize_performance_counters();
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38
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39 _gen = g;
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40 }
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41
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42 HeapWord* CMSPermGen::mem_allocate(size_t size) {
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43 Mutex* lock = _gen->freelistLock();
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44 bool lock_owned = lock->owned_by_self();
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45 if (lock_owned) {
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46 MutexUnlocker mul(lock);
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47 return mem_allocate_work(size);
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48 } else {
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49 return mem_allocate_work(size);
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50 }
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51 }
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52
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53 HeapWord* CMSPermGen::mem_allocate_work(size_t size) {
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54 assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock");
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55
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56 MutexLocker ml(Heap_lock);
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57 HeapWord* obj = NULL;
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58
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59 obj = _gen->allocate(size, false);
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60 // Since we want to minimize pause times, we will prefer
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61 // expanding the perm gen rather than doing a stop-world
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62 // collection to satisfy the allocation request.
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63 if (obj == NULL) {
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64 // Try to expand the perm gen and allocate space.
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65 obj = _gen->expand_and_allocate(size, false, false);
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66 if (obj == NULL) {
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67 // Let's see if a normal stop-world full collection will
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68 // free up enough space.
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69 SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
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70 obj = _gen->allocate(size, false);
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71 if (obj == NULL) {
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72 // The collection above may have shrunk the space, so try
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73 // to expand again and allocate space.
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74 obj = _gen->expand_and_allocate(size, false, false);
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75 }
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76 if (obj == NULL) {
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77 // We have not been able to allocate space despite a
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78 // full stop-world collection. We now make a last-ditch collection
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79 // attempt (in which soft refs are all aggressively freed)
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80 // that will try to reclaim as much space as possible.
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81 SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
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82 obj = _gen->allocate(size, false);
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83 if (obj == NULL) {
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84 // Expand generation in case it was shrunk following the collection.
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85 obj = _gen->expand_and_allocate(size, false, false);
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86 }
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87 }
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88 }
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89 }
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90 return obj;
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91 }
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92
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93 void CMSPermGen::compute_new_size() {
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94 _gen->compute_new_size();
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95 }
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96
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97 void CMSPermGenGen::initialize_performance_counters() {
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98
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99 const char* gen_name = "perm";
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100
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101 // Generation Counters - generation 2, 1 subspace
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102 _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
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103
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104 _gc_counters = NULL;
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105
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106 _space_counters = new GSpaceCounters(gen_name, 0,
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107 _virtual_space.reserved_size(),
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108 this, _gen_counters);
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109 }
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