Tue, 19 May 2015 15:49:27 +0200
8061715: gc/g1/TestShrinkAuxiliaryData15.java fails with java.lang.RuntimeException: heap decommit failed - after > before
Summary: added WhiteBox methods to count regions and exact aux data sizes
Reviewed-by: jwilhelm, brutisso
1 /*
2 * Copyright (c) 2014, 2015, 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 */
25 #include "precompiled.hpp"
26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
27 #include "oops/markOop.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "services/memTracker.hpp"
30 #ifdef TARGET_OS_FAMILY_linux
31 # include "os_linux.inline.hpp"
32 #endif
33 #ifdef TARGET_OS_FAMILY_solaris
34 # include "os_solaris.inline.hpp"
35 #endif
36 #ifdef TARGET_OS_FAMILY_windows
37 # include "os_windows.inline.hpp"
38 #endif
39 #ifdef TARGET_OS_FAMILY_aix
40 # include "os_aix.inline.hpp"
41 #endif
42 #ifdef TARGET_OS_FAMILY_bsd
43 # include "os_bsd.inline.hpp"
44 #endif
45 #include "utilities/bitMap.inline.hpp"
47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
48 _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
49 _dirty(), _executable(false) {
50 initialize_with_page_size(rs, used_size, page_size);
51 }
53 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
54 guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
56 assert(_low_boundary == NULL, "VirtualSpace already initialized");
57 assert(page_size > 0, "Page size must be non-zero.");
59 guarantee(is_ptr_aligned(rs.base(), page_size),
60 err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size));
61 guarantee(is_size_aligned(used_size, os::vm_page_size()),
62 err_msg("Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size));
63 guarantee(used_size <= rs.size(),
64 err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size()));
65 guarantee(is_size_aligned(rs.size(), page_size),
66 err_msg("Expected that the virtual space is size aligned, but " SIZE_FORMAT " is not aligned to page size " SIZE_FORMAT, rs.size(), page_size));
68 _low_boundary = rs.base();
69 _high_boundary = _low_boundary + used_size;
71 _special = rs.special();
72 _executable = rs.executable();
74 _page_size = page_size;
76 assert(_committed.size() == 0, "virtual space initialized more than once");
77 BitMap::idx_t size_in_pages = rs.size() / page_size;
78 _committed.resize(size_in_pages, /* in_resource_area */ false);
79 if (_special) {
80 _dirty.resize(size_in_pages, /* in_resource_area */ false);
81 }
83 _tail_size = used_size % _page_size;
84 }
86 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
87 release();
88 }
90 void G1PageBasedVirtualSpace::release() {
91 // This does not release memory it never reserved.
92 // Caller must release via rs.release();
93 _low_boundary = NULL;
94 _high_boundary = NULL;
95 _special = false;
96 _executable = false;
97 _page_size = 0;
98 _tail_size = 0;
99 _committed.resize(0, false);
100 _dirty.resize(0, false);
101 }
103 size_t G1PageBasedVirtualSpace::committed_size() const {
104 size_t result = _committed.count_one_bits() * _page_size;
105 // The last page might not be in full.
106 if (is_last_page_partial() && _committed.at(_committed.size() - 1)) {
107 result -= _page_size - _tail_size;
108 }
109 return result;
110 }
112 size_t G1PageBasedVirtualSpace::reserved_size() const {
113 return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
114 }
116 size_t G1PageBasedVirtualSpace::uncommitted_size() const {
117 return reserved_size() - committed_size();
118 }
120 size_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
121 return (addr - _low_boundary) / _page_size;
122 }
124 bool G1PageBasedVirtualSpace::is_area_committed(size_t start_page, size_t size_in_pages) const {
125 size_t end_page = start_page + size_in_pages;
126 return _committed.get_next_zero_offset(start_page, end_page) >= end_page;
127 }
129 bool G1PageBasedVirtualSpace::is_area_uncommitted(size_t start_page, size_t size_in_pages) const {
130 size_t end_page = start_page + size_in_pages;
131 return _committed.get_next_one_offset(start_page, end_page) >= end_page;
132 }
134 char* G1PageBasedVirtualSpace::page_start(size_t index) const {
135 return _low_boundary + index * _page_size;
136 }
138 bool G1PageBasedVirtualSpace::is_after_last_page(size_t index) const {
139 guarantee(index <= _committed.size(),
140 err_msg("Given boundary page " SIZE_FORMAT " is beyond managed page count " SIZE_FORMAT, index, _committed.size()));
141 return index == _committed.size();
142 }
144 void G1PageBasedVirtualSpace::commit_preferred_pages(size_t start, size_t num_pages) {
145 assert(num_pages > 0, "No full pages to commit");
146 assert(start + num_pages <= _committed.size(),
147 err_msg("Tried to commit area from page " SIZE_FORMAT " to page " SIZE_FORMAT " "
148 "that is outside of managed space of " SIZE_FORMAT " pages",
149 start, start + num_pages, _committed.size()));
151 char* start_addr = page_start(start);
152 size_t size = num_pages * _page_size;
154 os::commit_memory_or_exit(start_addr, size, _page_size, _executable,
155 err_msg("Failed to commit area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
156 p2i(start_addr), p2i(start_addr + size), size));
157 }
159 void G1PageBasedVirtualSpace::commit_tail() {
160 assert(_tail_size > 0, "The size of the tail area must be > 0 when reaching here");
162 char* const aligned_end_address = (char*)align_ptr_down(_high_boundary, _page_size);
163 os::commit_memory_or_exit(aligned_end_address, _tail_size, os::vm_page_size(), _executable,
164 err_msg("Failed to commit tail area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
165 p2i(aligned_end_address), p2i(_high_boundary), _tail_size));
166 }
168 void G1PageBasedVirtualSpace::commit_internal(size_t start_page, size_t end_page) {
169 guarantee(start_page < end_page,
170 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
171 guarantee(end_page <= _committed.size(),
172 err_msg("Given end page " SIZE_FORMAT " is beyond end of managed page amount of " SIZE_FORMAT, end_page, _committed.size()));
174 size_t pages = end_page - start_page;
175 bool need_to_commit_tail = is_after_last_page(end_page) && is_last_page_partial();
177 // If we have to commit some (partial) tail area, decrease the amount of pages to avoid
178 // committing that in the full-page commit code.
179 if (need_to_commit_tail) {
180 pages--;
181 }
183 if (pages > 0) {
184 commit_preferred_pages(start_page, pages);
185 }
187 if (need_to_commit_tail) {
188 commit_tail();
189 }
190 }
192 char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const {
193 return MIN2(_high_boundary, page_start(end_page));
194 }
196 void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) {
197 guarantee(start_page < end_page,
198 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
200 os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page));
201 }
203 bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
204 // We need to make sure to commit all pages covered by the given area.
205 guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
207 bool zero_filled = true;
208 size_t end_page = start_page + size_in_pages;
210 if (_special) {
211 // Check for dirty pages and update zero_filled if any found.
212 if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
213 zero_filled = false;
214 _dirty.clear_range(start_page, end_page);
215 }
216 } else {
217 commit_internal(start_page, end_page);
218 }
219 _committed.set_range(start_page, end_page);
221 if (AlwaysPreTouch) {
222 pretouch_internal(start_page, end_page);
223 }
224 return zero_filled;
225 }
227 void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
228 guarantee(start_page < end_page,
229 err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
231 char* start_addr = page_start(start_page);
232 os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char)));
233 }
235 void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) {
236 guarantee(is_area_committed(start_page, size_in_pages), "checking");
238 size_t end_page = start_page + size_in_pages;
239 if (_special) {
240 // Mark that memory is dirty. If committed again the memory might
241 // need to be cleared explicitly.
242 _dirty.set_range(start_page, end_page);
243 } else {
244 uncommit_internal(start_page, end_page);
245 }
247 _committed.clear_range(start_page, end_page);
248 }
250 bool G1PageBasedVirtualSpace::contains(const void* p) const {
251 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
252 }
254 #ifndef PRODUCT
255 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
256 out->print ("Virtual space:");
257 if (_special) out->print(" (pinned in memory)");
258 out->cr();
259 out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
260 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
261 out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
262 out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary));
263 }
265 void G1PageBasedVirtualSpace::print() {
266 print_on(tty);
267 }
268 #endif