Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp @ 20619:b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
author | stefank |
---|---|
date | Thu, 02 Oct 2014 10:55:36 +0200 |
parents | e7d0505c8a30 |
children | ae52ee069062 |
rev | line source |
---|---|
20337 | 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" | |
20339
7b2fc3129653
8055635: Missing include in g1RegionToSpaceMapper.hpp results in unresolved symbol of fastdebug build without precompiled headers
tschatzl
parents:
20337
diff
changeset
|
28 #include "memory/allocation.inline.hpp" |
20337 | 29 #include "runtime/virtualspace.hpp" |
30 #include "services/memTracker.hpp" | |
31 #include "utilities/bitMap.inline.hpp" | |
32 | |
33 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs, | |
34 size_t commit_granularity, | |
35 size_t region_granularity, | |
36 MemoryType type) : | |
37 _storage(), | |
38 _commit_granularity(commit_granularity), | |
39 _region_granularity(region_granularity), | |
40 _listener(NULL), | |
41 _commit_map() { | |
42 guarantee(is_power_of_2(commit_granularity), "must be"); | |
43 guarantee(is_power_of_2(region_granularity), "must be"); | |
44 _storage.initialize_with_granularity(rs, commit_granularity); | |
45 | |
46 MemTracker::record_virtual_memory_type((address)rs.base(), type); | |
47 } | |
48 | |
49 // G1RegionToSpaceMapper implementation where the region granularity is larger than | |
50 // or the same as the commit granularity. | |
51 // Basically, the space corresponding to one region region spans several OS pages. | |
52 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper { | |
53 private: | |
54 size_t _pages_per_region; | |
55 | |
56 public: | |
57 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs, | |
58 size_t os_commit_granularity, | |
59 size_t alloc_granularity, | |
60 size_t commit_factor, | |
61 MemoryType type) : | |
62 G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type), | |
63 _pages_per_region(alloc_granularity / (os_commit_granularity * commit_factor)) { | |
64 | |
65 guarantee(alloc_granularity >= os_commit_granularity, "allocation granularity smaller than commit granularity"); | |
66 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); | |
67 } | |
68 | |
69 virtual void commit_regions(uintptr_t start_idx, size_t num_regions) { | |
70 _storage.commit(start_idx * _pages_per_region, num_regions * _pages_per_region); | |
71 _commit_map.set_range(start_idx, start_idx + num_regions); | |
20543 | 72 fire_on_commit(start_idx, num_regions, true); |
20337 | 73 } |
74 | |
75 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) { | |
76 _storage.uncommit(start_idx * _pages_per_region, num_regions * _pages_per_region); | |
77 _commit_map.clear_range(start_idx, start_idx + num_regions); | |
78 } | |
79 }; | |
80 | |
81 // G1RegionToSpaceMapper implementation where the region granularity is smaller | |
82 // than the commit granularity. | |
83 // Basically, the contents of one OS page span several regions. | |
84 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper { | |
85 private: | |
86 class CommitRefcountArray : public G1BiasedMappedArray<uint> { | |
87 protected: | |
88 virtual uint default_value() const { return 0; } | |
89 }; | |
90 | |
91 size_t _regions_per_page; | |
92 | |
93 CommitRefcountArray _refcounts; | |
94 | |
95 uintptr_t region_idx_to_page_idx(uint region) const { | |
96 return region / _regions_per_page; | |
97 } | |
98 | |
99 public: | |
100 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, | |
101 size_t os_commit_granularity, | |
102 size_t alloc_granularity, | |
103 size_t commit_factor, | |
104 MemoryType type) : | |
105 G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type), | |
106 _regions_per_page((os_commit_granularity * commit_factor) / alloc_granularity), _refcounts() { | |
107 | |
108 guarantee((os_commit_granularity * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); | |
109 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + rs.size()), os_commit_granularity); | |
110 _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); | |
111 } | |
112 | |
113 virtual void commit_regions(uintptr_t start_idx, size_t num_regions) { | |
114 for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) { | |
115 assert(!_commit_map.at(i), err_msg("Trying to commit storage at region "INTPTR_FORMAT" that is already committed", i)); | |
116 uintptr_t idx = region_idx_to_page_idx(i); | |
117 uint old_refcount = _refcounts.get_by_index(idx); | |
20543 | 118 bool zero_filled = false; |
20337 | 119 if (old_refcount == 0) { |
120 _storage.commit(idx, 1); | |
20543 | 121 zero_filled = true; |
20337 | 122 } |
123 _refcounts.set_by_index(idx, old_refcount + 1); | |
124 _commit_map.set_bit(i); | |
20543 | 125 fire_on_commit(i, 1, zero_filled); |
20337 | 126 } |
127 } | |
128 | |
129 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) { | |
130 for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) { | |
131 assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region "INTPTR_FORMAT" that is not committed", i)); | |
132 uintptr_t idx = region_idx_to_page_idx(i); | |
133 uint old_refcount = _refcounts.get_by_index(idx); | |
134 assert(old_refcount > 0, "must be"); | |
135 if (old_refcount == 1) { | |
136 _storage.uncommit(idx, 1); | |
137 } | |
138 _refcounts.set_by_index(idx, old_refcount - 1); | |
139 _commit_map.clear_bit(i); | |
140 } | |
141 } | |
142 }; | |
143 | |
20543 | 144 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) { |
20337 | 145 if (_listener != NULL) { |
20543 | 146 _listener->on_commit(start_idx, num_regions, zero_filled); |
20337 | 147 } |
148 } | |
149 | |
150 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs, | |
151 size_t os_commit_granularity, | |
152 size_t region_granularity, | |
153 size_t commit_factor, | |
154 MemoryType type) { | |
155 | |
156 if (region_granularity >= (os_commit_granularity * commit_factor)) { | |
157 return new G1RegionsLargerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type); | |
158 } else { | |
159 return new G1RegionsSmallerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type); | |
160 } | |
161 } |