1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp Thu Aug 21 11:47:10 2014 +0200
1.3 @@ -0,0 +1,171 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
1.30 +#include "oops/markOop.hpp"
1.31 +#include "oops/oop.inline.hpp"
1.32 +#include "services/memTracker.hpp"
1.33 +#ifdef TARGET_OS_FAMILY_linux
1.34 +# include "os_linux.inline.hpp"
1.35 +#endif
1.36 +#ifdef TARGET_OS_FAMILY_solaris
1.37 +# include "os_solaris.inline.hpp"
1.38 +#endif
1.39 +#ifdef TARGET_OS_FAMILY_windows
1.40 +# include "os_windows.inline.hpp"
1.41 +#endif
1.42 +#ifdef TARGET_OS_FAMILY_aix
1.43 +# include "os_aix.inline.hpp"
1.44 +#endif
1.45 +#ifdef TARGET_OS_FAMILY_bsd
1.46 +# include "os_bsd.inline.hpp"
1.47 +#endif
1.48 +#include "utilities/bitMap.inline.hpp"
1.49 +
1.50 +G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
1.51 + _high_boundary(NULL), _committed(), _page_size(0), _special(false), _executable(false) {
1.52 +}
1.53 +
1.54 +bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
1.55 + if (!rs.is_reserved()) {
1.56 + return false; // Allocation failed.
1.57 + }
1.58 + assert(_low_boundary == NULL, "VirtualSpace already initialized");
1.59 + assert(page_size > 0, "Granularity must be non-zero.");
1.60 +
1.61 + _low_boundary = rs.base();
1.62 + _high_boundary = _low_boundary + rs.size();
1.63 +
1.64 + _special = rs.special();
1.65 + _executable = rs.executable();
1.66 +
1.67 + _page_size = page_size;
1.68 +
1.69 + assert(_committed.size() == 0, "virtual space initialized more than once");
1.70 + uintx size_in_bits = rs.size() / page_size;
1.71 + _committed.resize(size_in_bits, /* in_resource_area */ false);
1.72 +
1.73 + if (_special) {
1.74 + _committed.set_range(0, size_in_bits);
1.75 + }
1.76 +
1.77 + return true;
1.78 +}
1.79 +
1.80 +
1.81 +G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
1.82 + release();
1.83 +}
1.84 +
1.85 +void G1PageBasedVirtualSpace::release() {
1.86 + // This does not release memory it never reserved.
1.87 + // Caller must release via rs.release();
1.88 + _low_boundary = NULL;
1.89 + _high_boundary = NULL;
1.90 + _special = false;
1.91 + _executable = false;
1.92 + _page_size = 0;
1.93 + _committed.resize(0, false);
1.94 +}
1.95 +
1.96 +size_t G1PageBasedVirtualSpace::committed_size() const {
1.97 + return _committed.count_one_bits() * _page_size;
1.98 +}
1.99 +
1.100 +size_t G1PageBasedVirtualSpace::reserved_size() const {
1.101 + return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
1.102 +}
1.103 +
1.104 +size_t G1PageBasedVirtualSpace::uncommitted_size() const {
1.105 + return reserved_size() - committed_size();
1.106 +}
1.107 +
1.108 +uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
1.109 + return (addr - _low_boundary) / _page_size;
1.110 +}
1.111 +
1.112 +bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
1.113 + uintptr_t end = start + size_in_pages;
1.114 + return _committed.get_next_zero_offset(start, end) >= end;
1.115 +}
1.116 +
1.117 +bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
1.118 + uintptr_t end = start + size_in_pages;
1.119 + return _committed.get_next_one_offset(start, end) >= end;
1.120 +}
1.121 +
1.122 +char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
1.123 + return _low_boundary + index * _page_size;
1.124 +}
1.125 +
1.126 +size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
1.127 + return num * _page_size;
1.128 +}
1.129 +
1.130 +MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
1.131 + // We need to make sure to commit all pages covered by the given area.
1.132 + guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
1.133 +
1.134 + if (!_special) {
1.135 + os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
1.136 + err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
1.137 + }
1.138 + _committed.set_range(start, start + size_in_pages);
1.139 +
1.140 + MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
1.141 + return result;
1.142 +}
1.143 +
1.144 +MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
1.145 + guarantee(is_area_committed(start, size_in_pages), "checking");
1.146 +
1.147 + if (!_special) {
1.148 + os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
1.149 + }
1.150 +
1.151 + _committed.clear_range(start, start + size_in_pages);
1.152 +
1.153 + MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
1.154 + return result;
1.155 +}
1.156 +
1.157 +bool G1PageBasedVirtualSpace::contains(const void* p) const {
1.158 + return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
1.159 +}
1.160 +
1.161 +#ifndef PRODUCT
1.162 +void G1PageBasedVirtualSpace::print_on(outputStream* out) {
1.163 + out->print ("Virtual space:");
1.164 + if (special()) out->print(" (pinned in memory)");
1.165 + out->cr();
1.166 + out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
1.167 + out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
1.168 + out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary));
1.169 +}
1.170 +
1.171 +void G1PageBasedVirtualSpace::print() {
1.172 + print_on(tty);
1.173 +}
1.174 +#endif
