hotspot/src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp
author stefank
Tue, 23 Nov 2010 13:22:55 -0800
changeset 7397 5b173b4ca846
parent 5547 f4b087cbb361
child 14743 ce8a60f3dbe3
permissions -rw-r--r--
6989984: Use standard include model for Hospot Summary: Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
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/*
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 * Copyright (c) 2003, 2010, 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_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp"
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#include "runtime/java.hpp"
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AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,
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                                               size_t min_low_byte_size,
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                                               size_t min_high_byte_size,
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                                               size_t alignment) :
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  _reserved_space(rs), _min_low_byte_size(min_low_byte_size),
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  _min_high_byte_size(min_high_byte_size), _low(0), _high(0),
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  _alignment(alignment) {}
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// The maximum byte sizes are for the initial layout of the
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// virtual spaces and are not the limit on the maximum bytes sizes.
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void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,
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                                        size_t init_low_byte_size,
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                                        size_t init_high_byte_size) {
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  // The reserved spaces for the two parts of the virtual space.
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  ReservedSpace old_rs   = _reserved_space.first_part(max_low_byte_size);
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  ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);
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  _low = new PSVirtualSpace(old_rs, alignment());
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  if (!_low->expand_by(init_low_byte_size)) {
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    vm_exit_during_initialization("Could not reserve enough space for "
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                                  "object heap");
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  }
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  _high = new PSVirtualSpaceHighToLow(young_rs, alignment());
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  if (!_high->expand_by(init_high_byte_size)) {
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    vm_exit_during_initialization("Could not reserve enough space for "
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                                  "object heap");
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  }
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}
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bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {
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  assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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  size_t actual_change = low()->expand_into(high(), change_in_bytes);
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  return actual_change != 0;
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}
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bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {
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  assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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  size_t actual_change = high()->expand_into(low(), change_in_bytes);
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  return actual_change != 0;
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}