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/g1/g1BiasedArray.hpp" 27 #include "gc/g1/g1RegionToSpaceMapper.hpp" 28 #include "logging/log.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/virtualspace.hpp" 31 #include "runtime/java.hpp" 32 #include "runtime/os.inline.hpp" 33 #include "services/memTracker.hpp" 34 #include "utilities/align.hpp" 35 #include "utilities/bitMap.inline.hpp" 36 #include "utilities/formatBuffer.hpp" 37 38 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs, 39 size_t used_size, 40 size_t page_size, 41 size_t region_granularity, 42 size_t commit_factor, 43 MemoryType type) : 44 _listener(NULL), 45 _storage(rs, used_size, page_size), 46 _region_granularity(region_granularity), 47 _commit_map(rs.size() * commit_factor / region_granularity, mtGC) { 48 guarantee(is_power_of_2(page_size), "must be"); 49 guarantee(is_power_of_2(region_granularity), "must be"); 50 51 MemTracker::record_virtual_memory_type((address)rs.base(), type); 52 } 53 54 // G1RegionToSpaceMapper implementation where the region granularity is larger than 55 // or the same as the commit granularity. 56 // Basically, the space corresponding to one region region spans several OS pages. 57 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper { 58 private: 59 size_t _pages_per_region; 60 61 public: 62 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs, 63 size_t actual_size, 64 size_t page_size, 65 size_t alloc_granularity, 66 size_t commit_factor, 67 MemoryType type) : 68 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type), 69 _pages_per_region(alloc_granularity / (page_size * commit_factor)) { 70 71 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity"); 72 } 73 74 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) { 75 size_t const start_page = (size_t)start_idx * _pages_per_region; 76 bool zero_filled = _storage.commit(start_page, num_regions * _pages_per_region); 77 if (AlwaysPreTouch) { 78 _storage.pretouch(start_page, num_regions * _pages_per_region, pretouch_gang); 79 } 80 _commit_map.set_range(start_idx, start_idx + num_regions); 81 fire_on_commit(start_idx, num_regions, zero_filled); 82 } 83 84 virtual void uncommit_regions(uint start_idx, size_t num_regions) { 85 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region); 86 _commit_map.clear_range(start_idx, start_idx + num_regions); 87 } 88 }; 89 90 // G1RegionToSpaceMapper implementation where the region granularity is smaller 91 // than the commit granularity. 92 // Basically, the contents of one OS page span several regions. 93 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper { 94 private: 95 class CommitRefcountArray : public G1BiasedMappedArray<uint> { 96 protected: 97 virtual uint default_value() const { return 0; } 98 }; 109 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, 110 size_t actual_size, 111 size_t page_size, 112 size_t alloc_granularity, 113 size_t commit_factor, 114 MemoryType type) : 115 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type), 116 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() { 117 118 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); 119 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_up(rs.size(), page_size)), page_size); 120 } 121 122 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) { 123 size_t const NoPage = ~(size_t)0; 124 125 size_t first_committed = NoPage; 126 size_t num_committed = 0; 127 128 bool all_zero_filled = true; 129 130 for (uint i = start_idx; i < start_idx + num_regions; i++) { 131 assert(!_commit_map.at(i), "Trying to commit storage at region %u that is already committed", i); 132 size_t idx = region_idx_to_page_idx(i); 133 uint old_refcount = _refcounts.get_by_index(idx); 134 135 bool zero_filled = false; 136 if (old_refcount == 0) { 137 if (first_committed == NoPage) { 138 first_committed = idx; 139 num_committed = 1; 140 } else { 141 num_committed++; 142 } 143 zero_filled = _storage.commit(idx, 1); 144 } 145 all_zero_filled &= zero_filled; 146 147 _refcounts.set_by_index(idx, old_refcount + 1); 148 _commit_map.set_bit(i); 149 } 150 if (AlwaysPreTouch && num_committed > 0) { 151 _storage.pretouch(first_committed, num_committed, pretouch_gang); 152 } 153 fire_on_commit(start_idx, num_regions, all_zero_filled); 154 } 155 156 virtual void uncommit_regions(uint start_idx, size_t num_regions) { 157 for (uint i = start_idx; i < start_idx + num_regions; i++) { 158 assert(_commit_map.at(i), "Trying to uncommit storage at region %u that is not committed", i); 159 size_t idx = region_idx_to_page_idx(i); 160 uint old_refcount = _refcounts.get_by_index(idx); 161 assert(old_refcount > 0, "must be"); 162 if (old_refcount == 1) { 163 _storage.uncommit(idx, 1); 164 } 165 _refcounts.set_by_index(idx, old_refcount - 1); 166 _commit_map.clear_bit(i); 167 } 168 } | 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/g1/g1BiasedArray.hpp" 27 #include "gc/g1/g1NUMA.hpp" 28 #include "gc/g1/g1RegionToSpaceMapper.hpp" 29 #include "logging/log.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/virtualspace.hpp" 32 #include "runtime/java.hpp" 33 #include "runtime/os.inline.hpp" 34 #include "services/memTracker.hpp" 35 #include "utilities/align.hpp" 36 #include "utilities/bitMap.inline.hpp" 37 #include "utilities/formatBuffer.hpp" 38 39 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs, 40 size_t used_size, 41 size_t page_size, 42 size_t region_granularity, 43 size_t commit_factor, 44 MemoryType type) : 45 _listener(NULL), 46 _storage(rs, used_size, page_size), 47 _region_granularity(region_granularity), 48 _commit_map(rs.size() * commit_factor / region_granularity, mtGC), 49 _memory_type(type) { 50 guarantee(is_power_of_2(page_size), "must be"); 51 guarantee(is_power_of_2(region_granularity), "must be"); 52 53 MemTracker::record_virtual_memory_type((address)rs.base(), type); 54 } 55 56 // G1RegionToSpaceMapper implementation where the region granularity is larger than 57 // or the same as the commit granularity. 58 // Basically, the space corresponding to one region region spans several OS pages. 59 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper { 60 private: 61 size_t _pages_per_region; 62 63 public: 64 G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs, 65 size_t actual_size, 66 size_t page_size, 67 size_t alloc_granularity, 68 size_t commit_factor, 69 MemoryType type) : 70 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type), 71 _pages_per_region(alloc_granularity / (page_size * commit_factor)) { 72 73 guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity"); 74 } 75 76 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) { 77 const size_t start_page = (size_t)start_idx * _pages_per_region; 78 const size_t size_in_pages = num_regions * _pages_per_region; 79 bool zero_filled = _storage.commit(start_page, size_in_pages); 80 if (_memory_type == mtJavaHeap) { 81 for (uint region_index = start_idx; region_index < start_idx + num_regions; region_index++ ) { 82 void* address = _storage.page_start(region_index * _pages_per_region); 83 size_t size_in_bytes = _storage.page_size() * _pages_per_region; 84 G1NUMA::numa()->request_memory_on_node(address, size_in_bytes, region_index); 85 } 86 } 87 if (AlwaysPreTouch) { 88 _storage.pretouch(start_page, size_in_pages, pretouch_gang); 89 } 90 _commit_map.set_range(start_idx, start_idx + num_regions); 91 fire_on_commit(start_idx, num_regions, zero_filled); 92 } 93 94 virtual void uncommit_regions(uint start_idx, size_t num_regions) { 95 _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region); 96 _commit_map.clear_range(start_idx, start_idx + num_regions); 97 } 98 }; 99 100 // G1RegionToSpaceMapper implementation where the region granularity is smaller 101 // than the commit granularity. 102 // Basically, the contents of one OS page span several regions. 103 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper { 104 private: 105 class CommitRefcountArray : public G1BiasedMappedArray<uint> { 106 protected: 107 virtual uint default_value() const { return 0; } 108 }; 119 G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, 120 size_t actual_size, 121 size_t page_size, 122 size_t alloc_granularity, 123 size_t commit_factor, 124 MemoryType type) : 125 G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, commit_factor, type), 126 _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() { 127 128 guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); 129 _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_up(rs.size(), page_size)), page_size); 130 } 131 132 virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) { 133 size_t const NoPage = ~(size_t)0; 134 135 size_t first_committed = NoPage; 136 size_t num_committed = 0; 137 138 bool all_zero_filled = true; 139 G1NUMA* numa = G1NUMA::numa(); 140 141 for (uint region_idx = start_idx; region_idx < start_idx + num_regions; region_idx++) { 142 assert(!_commit_map.at(region_idx), "Trying to commit storage at region %u that is already committed", region_idx); 143 size_t page_idx = region_idx_to_page_idx(region_idx); 144 uint old_refcount = _refcounts.get_by_index(page_idx); 145 146 bool zero_filled = false; 147 if (old_refcount == 0) { 148 if (first_committed == NoPage) { 149 first_committed = page_idx; 150 num_committed = 1; 151 } else { 152 num_committed++; 153 } 154 zero_filled = _storage.commit(page_idx, 1); 155 if (_memory_type == mtJavaHeap) { 156 void* address = _storage.page_start(page_idx); 157 size_t size_in_bytes = _storage.page_size(); 158 numa->request_memory_on_node(address, size_in_bytes, region_idx); 159 } 160 } 161 all_zero_filled &= zero_filled; 162 163 _refcounts.set_by_index(page_idx, old_refcount + 1); 164 _commit_map.set_bit(region_idx); 165 } 166 if (AlwaysPreTouch && num_committed > 0) { 167 _storage.pretouch(first_committed, num_committed, pretouch_gang); 168 } 169 fire_on_commit(start_idx, num_regions, all_zero_filled); 170 } 171 172 virtual void uncommit_regions(uint start_idx, size_t num_regions) { 173 for (uint i = start_idx; i < start_idx + num_regions; i++) { 174 assert(_commit_map.at(i), "Trying to uncommit storage at region %u that is not committed", i); 175 size_t idx = region_idx_to_page_idx(i); 176 uint old_refcount = _refcounts.get_by_index(idx); 177 assert(old_refcount > 0, "must be"); 178 if (old_refcount == 1) { 179 _storage.uncommit(idx, 1); 180 } 181 _refcounts.set_by_index(idx, old_refcount - 1); 182 _commit_map.clear_bit(i); 183 } 184 } |