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1 /*
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2 * Copyright 2001-2008 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/_psPermGen.cpp.incl"
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27
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28 PSPermGen::PSPermGen(ReservedSpace rs, size_t alignment,
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29 size_t initial_size, size_t min_size, size_t max_size,
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30 const char* gen_name, int level) :
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31 PSOldGen(rs, alignment, initial_size, min_size, max_size, gen_name, level),
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32 _last_used(0)
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33 {
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34 assert(object_mark_sweep() != NULL, "Sanity");
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35
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36 object_mark_sweep()->set_allowed_dead_ratio(PermMarkSweepDeadRatio);
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37 _avg_size = new AdaptivePaddedAverage(AdaptivePermSizeWeight,
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38 PermGenPadding);
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39 }
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40
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41 HeapWord* PSPermGen::allocate_permanent(size_t size) {
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42 assert_locked_or_safepoint(Heap_lock);
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43 HeapWord* obj = allocate_noexpand(size, false);
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44
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45 if (obj == NULL) {
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46 obj = expand_and_allocate(size, false);
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47 }
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48
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49 return obj;
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50 }
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51
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52 void PSPermGen::compute_new_size(size_t used_before_collection) {
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53 // Update our padded average of objects allocated in perm
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54 // gen between collections.
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55 assert(used_before_collection >= _last_used,
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56 "negative allocation amount since last GC?");
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57
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58 const size_t alloc_since_last_gc = used_before_collection - _last_used;
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59 _avg_size->sample(alloc_since_last_gc);
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60
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61 const size_t current_live = used_in_bytes();
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62 // Stash away the current amount live for the next call to this method.
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63 _last_used = current_live;
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64
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65 // We have different alignment constraints than the rest of the heap.
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66 const size_t alignment = MAX2(MinPermHeapExpansion,
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67 virtual_space()->alignment());
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68
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69 // Compute the desired size:
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70 // The free space is the newly computed padded average,
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71 // so the desired size is what's live + the free space.
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72 size_t desired_size = current_live + (size_t)_avg_size->padded_average();
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73 desired_size = align_size_up(desired_size, alignment);
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74
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75 // ...and no larger or smaller than our max and min allowed.
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76 desired_size = MAX2(MIN2(desired_size, _max_gen_size), _min_gen_size);
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77 assert(desired_size <= _max_gen_size, "just checking");
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78
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79 const size_t size_before = _virtual_space->committed_size();
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80
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81 if (desired_size == size_before) {
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82 // no change, we're done
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83 return;
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84 }
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85
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86 {
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87 // We'll be growing or shrinking the heap: in either case,
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88 // we need to hold a lock.
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89 MutexLocker x(ExpandHeap_lock);
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90 if (desired_size > size_before) {
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91 const size_t change_bytes = desired_size - size_before;
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92 const size_t aligned_change_bytes =
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93 align_size_up(change_bytes, alignment);
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94 expand_by(aligned_change_bytes);
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95 } else {
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96 // Shrinking
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97 const size_t change_bytes =
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98 size_before - desired_size;
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99 const size_t aligned_change_bytes = align_size_down(change_bytes, alignment);
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100 shrink(aligned_change_bytes);
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101 }
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102 }
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103
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104 // While this code isn't controlled by AdaptiveSizePolicy, it's
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105 // convenient to see all resizing decsions under the same flag.
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106 if (PrintAdaptiveSizePolicy) {
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107 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
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108 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
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109
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110 gclog_or_tty->print_cr("AdaptiveSizePolicy::perm generation size: "
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111 "collection: %d "
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112 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ",
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113 heap->total_collections(),
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114 size_before, _virtual_space->committed_size());
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115 }
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116 }
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117
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118
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119
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120 void PSPermGen::move_and_update(ParCompactionManager* cm) {
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121 PSParallelCompact::move_and_update(cm, PSParallelCompact::perm_space_id);
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122 }
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123
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124 void PSPermGen::precompact() {
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125 // Reset start array first.
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126 _start_array.reset();
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127 object_mark_sweep()->precompact();
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128 }
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