1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp Thu Aug 21 11:47:10 2014 +0200
1.3 @@ -0,0 +1,158 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "gc_implementation/g1/g1BiasedArray.hpp"
1.30 +#include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
1.31 +#include "runtime/virtualspace.hpp"
1.32 +#include "services/memTracker.hpp"
1.33 +#include "utilities/bitMap.inline.hpp"
1.34 +
1.35 +G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
1.36 + size_t commit_granularity,
1.37 + size_t region_granularity,
1.38 + MemoryType type) :
1.39 + _storage(),
1.40 + _commit_granularity(commit_granularity),
1.41 + _region_granularity(region_granularity),
1.42 + _listener(NULL),
1.43 + _commit_map() {
1.44 + guarantee(is_power_of_2(commit_granularity), "must be");
1.45 + guarantee(is_power_of_2(region_granularity), "must be");
1.46 + _storage.initialize_with_granularity(rs, commit_granularity);
1.47 +
1.48 + MemTracker::record_virtual_memory_type((address)rs.base(), type);
1.49 +}
1.50 +
1.51 +// G1RegionToSpaceMapper implementation where the region granularity is larger than
1.52 +// or the same as the commit granularity.
1.53 +// Basically, the space corresponding to one region region spans several OS pages.
1.54 +class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
1.55 + private:
1.56 + size_t _pages_per_region;
1.57 +
1.58 + public:
1.59 + G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
1.60 + size_t os_commit_granularity,
1.61 + size_t alloc_granularity,
1.62 + size_t commit_factor,
1.63 + MemoryType type) :
1.64 + G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
1.65 + _pages_per_region(alloc_granularity / (os_commit_granularity * commit_factor)) {
1.66 +
1.67 + guarantee(alloc_granularity >= os_commit_granularity, "allocation granularity smaller than commit granularity");
1.68 + _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
1.69 + }
1.70 +
1.71 + virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
1.72 + _storage.commit(start_idx * _pages_per_region, num_regions * _pages_per_region);
1.73 + _commit_map.set_range(start_idx, start_idx + num_regions);
1.74 + fire_on_commit(start_idx, num_regions);
1.75 + }
1.76 +
1.77 + virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
1.78 + _storage.uncommit(start_idx * _pages_per_region, num_regions * _pages_per_region);
1.79 + _commit_map.clear_range(start_idx, start_idx + num_regions);
1.80 + }
1.81 +};
1.82 +
1.83 +// G1RegionToSpaceMapper implementation where the region granularity is smaller
1.84 +// than the commit granularity.
1.85 +// Basically, the contents of one OS page span several regions.
1.86 +class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
1.87 + private:
1.88 + class CommitRefcountArray : public G1BiasedMappedArray<uint> {
1.89 + protected:
1.90 + virtual uint default_value() const { return 0; }
1.91 + };
1.92 +
1.93 + size_t _regions_per_page;
1.94 +
1.95 + CommitRefcountArray _refcounts;
1.96 +
1.97 + uintptr_t region_idx_to_page_idx(uint region) const {
1.98 + return region / _regions_per_page;
1.99 + }
1.100 +
1.101 + public:
1.102 + G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
1.103 + size_t os_commit_granularity,
1.104 + size_t alloc_granularity,
1.105 + size_t commit_factor,
1.106 + MemoryType type) :
1.107 + G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
1.108 + _regions_per_page((os_commit_granularity * commit_factor) / alloc_granularity), _refcounts() {
1.109 +
1.110 + guarantee((os_commit_granularity * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
1.111 + _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + rs.size()), os_commit_granularity);
1.112 + _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
1.113 + }
1.114 +
1.115 + virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
1.116 + for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
1.117 + assert(!_commit_map.at(i), err_msg("Trying to commit storage at region "INTPTR_FORMAT" that is already committed", i));
1.118 + uintptr_t idx = region_idx_to_page_idx(i);
1.119 + uint old_refcount = _refcounts.get_by_index(idx);
1.120 + if (old_refcount == 0) {
1.121 + _storage.commit(idx, 1);
1.122 + }
1.123 + _refcounts.set_by_index(idx, old_refcount + 1);
1.124 + _commit_map.set_bit(i);
1.125 + fire_on_commit(i, 1);
1.126 + }
1.127 + }
1.128 +
1.129 + virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
1.130 + for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
1.131 + assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region "INTPTR_FORMAT" that is not committed", i));
1.132 + uintptr_t idx = region_idx_to_page_idx(i);
1.133 + uint old_refcount = _refcounts.get_by_index(idx);
1.134 + assert(old_refcount > 0, "must be");
1.135 + if (old_refcount == 1) {
1.136 + _storage.uncommit(idx, 1);
1.137 + }
1.138 + _refcounts.set_by_index(idx, old_refcount - 1);
1.139 + _commit_map.clear_bit(i);
1.140 + }
1.141 + }
1.142 +};
1.143 +
1.144 +void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions) {
1.145 + if (_listener != NULL) {
1.146 + _listener->on_commit(start_idx, num_regions);
1.147 + }
1.148 +}
1.149 +
1.150 +G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs,
1.151 + size_t os_commit_granularity,
1.152 + size_t region_granularity,
1.153 + size_t commit_factor,
1.154 + MemoryType type) {
1.155 +
1.156 + if (region_granularity >= (os_commit_granularity * commit_factor)) {
1.157 + return new G1RegionsLargerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
1.158 + } else {
1.159 + return new G1RegionsSmallerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
1.160 + }
1.161 +}
