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84 lines
3.1 KiB
C++
84 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "gc/parallel/psFileBackedVirtualspace.hpp"
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#include "memory/virtualspace.hpp"
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#include "runtime/os.inline.hpp"
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PSFileBackedVirtualSpace::PSFileBackedVirtualSpace(ReservedSpace rs, size_t alignment, const char* path) : PSVirtualSpace(rs, alignment),
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_file_path(path), _fd(-1), _mapping_succeeded(false) {
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assert(!rs.special(), "ReservedSpace passed to PSFileBackedVirtualSpace cannot be special");
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}
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bool PSFileBackedVirtualSpace::initialize() {
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_fd = os::create_file_for_heap(_file_path);
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if (_fd == -1) {
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return false;
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}
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// We map the reserved space to a file at initialization.
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char* ret = os::replace_existing_mapping_with_file_mapping(reserved_low_addr(), reserved_size(), _fd);
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if (ret != reserved_low_addr()) {
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os::close(_fd);
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return false;
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}
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// _mapping_succeeded is false if we return before this point.
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// expand calls later check value of this flag and return error if it is false.
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_mapping_succeeded = true;
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_special = true;
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os::close(_fd);
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return true;
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}
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bool PSFileBackedVirtualSpace::expand_by(size_t bytes) {
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assert(special(), "Since entire space is committed at initialization, _special should always be true for PSFileBackedVirtualSpace");
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// if mapping did not succeed during intialization return false
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if (!_mapping_succeeded) {
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return false;
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}
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return PSVirtualSpace::expand_by(bytes);
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}
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bool PSFileBackedVirtualSpace::shrink_by(size_t bytes) {
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assert(special(), "Since entire space is committed at initialization, _special should always be true for PSFileBackedVirtualSpace");
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return PSVirtualSpace::shrink_by(bytes);
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}
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size_t PSFileBackedVirtualSpace::expand_into(PSVirtualSpace* space, size_t bytes) {
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// not supported. Since doing this will change page mapping which will lead to large TLB penalties.
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assert(false, "expand_into() should not be called for PSFileBackedVirtualSpace");
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return 0;
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}
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void PSFileBackedVirtualSpace::release() {
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os::close(_fd);
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_fd = -1;
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_file_path = NULL;
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PSVirtualSpace::release();
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}
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