1 /* 2 * Copyright (c) 2003, 2010, 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/parallelScavenge/adjoiningVirtualSpaces.hpp" 27 #include "runtime/java.hpp" 28 29 AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs, 30 size_t min_low_byte_size, 31 size_t min_high_byte_size, 32 size_t alignment) : 33 _reserved_space(rs), _min_low_byte_size(min_low_byte_size), 34 _min_high_byte_size(min_high_byte_size), _low(0), _high(0), 35 _alignment(alignment) {} 36 37 // The maximum byte sizes are for the initial layout of the 38 // virtual spaces and are not the limit on the maximum bytes sizes. 39 void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size, 40 size_t init_low_byte_size, 41 size_t init_high_byte_size) { 42 43 // The reserved spaces for the two parts of the virtual space. 44 ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size); 45 ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size); 46 47 _low = new PSVirtualSpace(old_rs, alignment()); 48 if (!_low->expand_by(init_low_byte_size)) { 49 vm_exit_during_initialization("Could not reserve enough space for " 50 "object heap"); 51 } 52 53 _high = new PSVirtualSpaceHighToLow(young_rs, alignment()); 54 if (!_high->expand_by(init_high_byte_size)) { 55 vm_exit_during_initialization("Could not reserve enough space for " 56 "object heap"); 57 } 58 } 59 60 bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) { 61 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); 62 size_t actual_change = low()->expand_into(high(), change_in_bytes); 63 return actual_change != 0; 64 } 65 66 bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) { 67 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); 68 size_t actual_change = high()->expand_into(low(), change_in_bytes); 69 return actual_change != 0; 70 }