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comparison src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp @ 20337:1f1d373cd044

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8038423: G1: Decommit memory within heap Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps. Reviewed-by: mgerdin, brutisso, jwilhelm
author tschatzl
date Thu, 21 Aug 2014 11:47:10 +0200
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children 7b2fc3129653
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20336:6701abbc4441 20337:1f1d373cd044
1 /*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc_implementation/g1/g1BiasedArray.hpp"
27 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
28 #include "runtime/virtualspace.hpp"
29 #include "services/memTracker.hpp"
30 #include "utilities/bitMap.inline.hpp"
31
32 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
33 size_t commit_granularity,
34 size_t region_granularity,
35 MemoryType type) :
36 _storage(),
37 _commit_granularity(commit_granularity),
38 _region_granularity(region_granularity),
39 _listener(NULL),
40 _commit_map() {
41 guarantee(is_power_of_2(commit_granularity), "must be");
42 guarantee(is_power_of_2(region_granularity), "must be");
43 _storage.initialize_with_granularity(rs, commit_granularity);
44
45 MemTracker::record_virtual_memory_type((address)rs.base(), type);
46 }
47
48 // G1RegionToSpaceMapper implementation where the region granularity is larger than
49 // or the same as the commit granularity.
50 // Basically, the space corresponding to one region region spans several OS pages.
51 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
52 private:
53 size_t _pages_per_region;
54
55 public:
56 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
57 size_t os_commit_granularity,
58 size_t alloc_granularity,
59 size_t commit_factor,
60 MemoryType type) :
61 G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
62 _pages_per_region(alloc_granularity / (os_commit_granularity * commit_factor)) {
63
64 guarantee(alloc_granularity >= os_commit_granularity, "allocation granularity smaller than commit granularity");
65 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
66 }
67
68 virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
69 _storage.commit(start_idx * _pages_per_region, num_regions * _pages_per_region);
70 _commit_map.set_range(start_idx, start_idx + num_regions);
71 fire_on_commit(start_idx, num_regions);
72 }
73
74 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
75 _storage.uncommit(start_idx * _pages_per_region, num_regions * _pages_per_region);
76 _commit_map.clear_range(start_idx, start_idx + num_regions);
77 }
78 };
79
80 // G1RegionToSpaceMapper implementation where the region granularity is smaller
81 // than the commit granularity.
82 // Basically, the contents of one OS page span several regions.
83 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
84 private:
85 class CommitRefcountArray : public G1BiasedMappedArray<uint> {
86 protected:
87 virtual uint default_value() const { return 0; }
88 };
89
90 size_t _regions_per_page;
91
92 CommitRefcountArray _refcounts;
93
94 uintptr_t region_idx_to_page_idx(uint region) const {
95 return region / _regions_per_page;
96 }
97
98 public:
99 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
100 size_t os_commit_granularity,
101 size_t alloc_granularity,
102 size_t commit_factor,
103 MemoryType type) :
104 G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
105 _regions_per_page((os_commit_granularity * commit_factor) / alloc_granularity), _refcounts() {
106
107 guarantee((os_commit_granularity * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
108 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + rs.size()), os_commit_granularity);
109 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
110 }
111
112 virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
113 for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
114 assert(!_commit_map.at(i), err_msg("Trying to commit storage at region "INTPTR_FORMAT" that is already committed", i));
115 uintptr_t idx = region_idx_to_page_idx(i);
116 uint old_refcount = _refcounts.get_by_index(idx);
117 if (old_refcount == 0) {
118 _storage.commit(idx, 1);
119 }
120 _refcounts.set_by_index(idx, old_refcount + 1);
121 _commit_map.set_bit(i);
122 fire_on_commit(i, 1);
123 }
124 }
125
126 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
127 for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
128 assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region "INTPTR_FORMAT" that is not committed", i));
129 uintptr_t idx = region_idx_to_page_idx(i);
130 uint old_refcount = _refcounts.get_by_index(idx);
131 assert(old_refcount > 0, "must be");
132 if (old_refcount == 1) {
133 _storage.uncommit(idx, 1);
134 }
135 _refcounts.set_by_index(idx, old_refcount - 1);
136 _commit_map.clear_bit(i);
137 }
138 }
139 };
140
141 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions) {
142 if (_listener != NULL) {
143 _listener->on_commit(start_idx, num_regions);
144 }
145 }
146
147 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs,
148 size_t os_commit_granularity,
149 size_t region_granularity,
150 size_t commit_factor,
151 MemoryType type) {
152
153 if (region_granularity >= (os_commit_granularity * commit_factor)) {
154 return new G1RegionsLargerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
155 } else {
156 return new G1RegionsSmallerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
157 }
158 }