| /* |
| * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/parallel/adjoiningVirtualSpaces.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "runtime/java.hpp" |
| |
| AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs, |
| size_t min_low_byte_size, |
| size_t min_high_byte_size, |
| size_t alignment) : |
| _reserved_space(rs), _min_low_byte_size(min_low_byte_size), |
| _min_high_byte_size(min_high_byte_size), _low(0), _high(0), |
| _alignment(alignment) {} |
| |
| // The maximum byte sizes are for the initial layout of the |
| // virtual spaces and are not the limit on the maximum bytes sizes. |
| void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size, |
| size_t init_low_byte_size, |
| size_t init_high_byte_size) { |
| |
| // The reserved spaces for the two parts of the virtual space. |
| ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size); |
| ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size); |
| |
| _low = new PSVirtualSpace(old_rs, alignment()); |
| if (!_low->expand_by(init_low_byte_size)) { |
| vm_exit_during_initialization("Could not reserve enough space for " |
| "object heap"); |
| } |
| |
| _high = new PSVirtualSpaceHighToLow(young_rs, alignment()); |
| if (!_high->expand_by(init_high_byte_size)) { |
| vm_exit_during_initialization("Could not reserve enough space for " |
| "object heap"); |
| } |
| } |
| |
| bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) { |
| assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
| size_t actual_change = low()->expand_into(high(), change_in_bytes); |
| return actual_change != 0; |
| } |
| |
| bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) { |
| assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
| size_t actual_change = high()->expand_into(low(), change_in_bytes); |
| return actual_change != 0; |
| } |