1 /* 2 * Copyright (c) 2001, 2016, 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/g1/g1Analytics.hpp" 27 #include "gc/g1/g1CollectorPolicy.hpp" 28 #include "gc/g1/g1YoungGenSizer.hpp" 29 #include "gc/g1/heapRegion.hpp" 30 #include "gc/g1/heapRegionRemSet.hpp" 31 #include "gc/shared/gcPolicyCounters.hpp" 32 #include "runtime/globals.hpp" 33 #include "utilities/debug.hpp" 34 35 G1CollectorPolicy::G1CollectorPolicy() { 36 37 // Set up the region size and associated fields. Given that the 38 // policy is created before the heap, we have to set this up here, 39 // so it's done as soon as possible. 40 41 // It would have been natural to pass initial_heap_byte_size() and 42 // max_heap_byte_size() to setup_heap_region_size() but those have 43 // not been set up at this point since they should be aligned with 44 // the region size. So, there is a circular dependency here. We base 45 // the region size on the heap size, but the heap size should be 46 // aligned with the region size. To get around this we use the 47 // unaligned values for the heap. 48 HeapRegion::setup_heap_region_size(InitialHeapSize, MaxHeapSize); 49 HeapRegionRemSet::setup_remset_size(); 50 } 51 52 void G1CollectorPolicy::initialize_alignments() { 53 _space_alignment = HeapRegion::GrainBytes; 54 size_t card_table_alignment = CardTableRS::ct_max_alignment_constraint(); 55 size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size(); 56 _heap_alignment = MAX3(card_table_alignment, _space_alignment, page_size); 57 } 58 59 size_t G1CollectorPolicy::heap_reservation_size_bytes() { 60 return _max_heap_byte_size; 61 } 62 63 G1HeteroCollectorPolicy::G1HeteroCollectorPolicy() : _heap_reservation_size_bytes(MaxHeapSize*2) { 64 } 65 66 void G1HeteroCollectorPolicy::initialize_size_info() { 67 G1CollectorPolicy::initialize_size_info(); 68 _heap_reservation_size_bytes = 2 * _max_heap_byte_size; 69 } 70 71 size_t G1HeteroCollectorPolicy::heap_reservation_size_bytes() { 72 return _heap_reservation_size_bytes; 73 }