1 /*
2 * Copyright (c) 2018, 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
24 #include "precompiled.hpp"
25 #include "memory/virtualspace.hpp"
26 #include "runtime/os.hpp"
27 #include "oops/oop.hpp"
28 #include "utilities/align.hpp"
29 #include "unittest.hpp"
30
31 namespace {
32 static void small_page_write(void* addr, size_t size) {
33 size_t page_size = os::vm_page_size();
34
35 char* end = (char*) addr + size;
36 for (char* p = (char*) addr; p < end; p += page_size) {
37 *p = 1;
38 }
39 }
40
41 static void release_memory_for_test(ReservedSpace rs) {
42 if (rs.special()) {
43 ASSERT_TRUE(os::release_memory_special(rs.base(), rs.size()));
44 } else {
45 ASSERT_TRUE(os::release_memory(rs.base(), rs.size()));
46 }
47 }
48
49 // have to use these functions, as gtest's _PRED macros don't like is_aligned
50 // nor (is_aligned<size_t, size_t>)
51 static bool is_size_alignment(size_t size, size_t alignment) {
52 return is_aligned(size, alignment);
53 }
54 static bool is_ptr_alignment(void* ptr, size_t alignment) {
55 return is_aligned(ptr, alignment);
56 }
57
58 static void test_reserved_size(size_t size) {
59 ASSERT_PRED2(is_size_alignment, size, os::vm_allocation_granularity());
60
61 ReservedSpace rs(size);
62
63 EXPECT_TRUE(rs.base() != NULL) << "rs.special: " << rs.special();
64 EXPECT_EQ(size, rs.size()) << "rs.special: " << rs.special();
65
66 if (rs.special()) {
67 small_page_write(rs.base(), size);
68 }
69
70 release_memory_for_test(rs);
71 }
72
73 static void test_reserved_size_alignment(size_t size, size_t alignment) {
74 ASSERT_PRED2(is_size_alignment, size, alignment) << "Incorrect input parameters";
75
76 ReservedSpace rs(size, alignment, UseLargePages, (char *) NULL);
77
78 ASSERT_TRUE(rs.base() != NULL) << "rs.special = " << rs.special();
79 ASSERT_EQ(size, rs.size()) << "rs.special = " << rs.special();
80
81 EXPECT_PRED2(is_ptr_alignment, rs.base(), alignment)
82 << "aligned sizes should always give aligned addresses";
83 EXPECT_PRED2(is_ptr_alignment, (void*) rs.size(), alignment)
84 << "aligned sizes should always give aligned addresses";
85
86 if (rs.special()) {
87 small_page_write(rs.base(), size);
88 }
89
90 release_memory_for_test(rs);
91 }
92
93 static void test_reserved_size_alignment_page_type(size_t size, size_t alignment, bool maybe_large) {
94 if (size < alignment) {
95 // Tests might set -XX:LargePageSizeInBytes=<small pages> and cause unexpected input arguments for this test.
96 ASSERT_EQ((size_t) os::vm_page_size(), os::large_page_size()) << "Test needs further refinement";
97 return;
98 }
99
100 ASSERT_PRED2(is_size_alignment, size, os::vm_allocation_granularity()) << "Must be at least AG aligned";
101 ASSERT_PRED2(is_size_alignment, size, alignment) << "Must be at least AG aligned";
102
103 bool large = maybe_large && UseLargePages && size >= os::large_page_size();
104
105 ReservedSpace rs(size, alignment, large, false);
106
107 EXPECT_TRUE(rs.base() != NULL) << "rs.special: " << rs.special();
108 EXPECT_EQ(size, rs.size()) << "rs.special: " << rs.special();
109
110 if (rs.special()) {
111 small_page_write(rs.base(), size);
112 }
113
114 release_memory_for_test(rs);
115 }
116 }
117
118 TEST_VM(ReservedSpace, size_alignment) {
119 size_t size = 2 * 1024 * 1024;
120 size_t ag = os::vm_allocation_granularity();
121
122 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment(size, ag));
123 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment(size * 2, ag));
124 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment(size * 10, ag));
125 }
126
127 TEST_VM(ReservedSpace, size) {
128 size_t size = 2 * 1024 * 1024;
129 size_t ag = os::vm_allocation_granularity();
130
131 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 1));
132 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 2));
133 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 10));
134 EXPECT_NO_FATAL_FAILURE(test_reserved_size(ag));
135 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size - ag));
136 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size));
137 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size + ag));
138 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 2));
139 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 2 - ag));
140 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 2 + ag));
141 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 3));
142 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 3 - ag));
143 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 3 + ag));
144 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 10));
145 EXPECT_NO_FATAL_FAILURE(test_reserved_size(size * 10 + size / 2));
146 }
147
148 TEST_VM(ReservedSpace, size_alignment_page_type) {
149 size_t ag = os::vm_allocation_granularity();
150
151 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag, ag , false));
152 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 2, ag , false));
153 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 3, ag , false));
154 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 2, ag * 2, false));
155 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 4, ag * 2, false));
156 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 8, ag * 2, false));
157 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 4, ag * 4, false));
158 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 8, ag * 4, false));
159 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(ag * 16, ag * 4, false));
160
161 if (UseLargePages) {
162 size_t lp = os::large_page_size();
163
164 // Without large pages
165 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp, ag * 4, false));
166 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 2, ag * 4, false));
167 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 4, ag * 4, false));
168 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp, lp , false));
169 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 2, lp , false));
170 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 3, lp , false));
171 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 2, lp * 2, false));
172 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 4, lp * 2, false));
173 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 8, lp * 2, false));
174
175 // With large pages
176 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp, ag * 4 , true));
177 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 2, ag * 4, true));
178 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 4, ag * 4, true));
179 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp, lp , true));
180 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 2, lp , true));
181 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 3, lp , true));
182 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 2, lp * 2, true));
183 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 4, lp * 2, true));
184 EXPECT_NO_FATAL_FAILURE(test_reserved_size_alignment_page_type(lp * 8, lp * 2, true));
185 }
186 }
187
188 namespace {
189 enum TestLargePages {
190 Default,
191 Disable,
192 Reserve,
193 Commit
194 };
195
196 class ReservedSpaceReleaser {
197 ReservedSpace* const _rs;
198 public:
199 ReservedSpaceReleaser(ReservedSpace* rs) : _rs(rs) { }
200 ~ReservedSpaceReleaser() {
201 _rs->release();
202 }
203 };
204
205 ReservedSpace reserve_memory(size_t reserve_size_aligned, TestLargePages mode) {
206 switch(mode) {
207 default:
208 case Default:
209 case Reserve:
210 return ReservedSpace(reserve_size_aligned);
211 case Disable:
212 case Commit:
213 return ReservedSpace(reserve_size_aligned,
214 os::vm_allocation_granularity(),
215 /* large */ false, /* exec */ false);
216 }
217 }
218
219 bool initialize_virtual_space(VirtualSpace& vs, ReservedSpace rs, TestLargePages mode) {
220 switch(mode) {
221 default:
222 case Default:
223 case Reserve:
224 return vs.initialize(rs, 0);
225 case Disable:
226 return vs.initialize_with_granularity(rs, 0, os::vm_page_size());
227 case Commit:
228 return vs.initialize_with_granularity(rs, 0, os::page_size_for_region_unaligned(rs.size(), 1));
229 }
230 }
231
232 void test_virtual_space_actual_committed_space(size_t reserve_size, size_t commit_size,
233 TestLargePages mode = Default) {
234 size_t granularity = os::vm_allocation_granularity();
235 size_t reserve_size_aligned = align_up(reserve_size, granularity);
236
237 ReservedSpace reserved = reserve_memory(reserve_size_aligned, mode);
238 ReservedSpaceReleaser releaser(&reserved);
239
240 ASSERT_TRUE(reserved.is_reserved());
241
242 VirtualSpace vs;
243 ASSERT_TRUE(initialize_virtual_space(vs, reserved, mode)) << "Failed to initialize VirtualSpace";
244 vs.expand_by(commit_size, false);
245
246 if (vs.special()) {
247 EXPECT_EQ(reserve_size_aligned, vs.actual_committed_size());
248 } else {
249 EXPECT_GE(vs.actual_committed_size(), commit_size);
250 // Approximate the commit granularity.
251 // Make sure that we don't commit using large pages
252 // if large pages has been disabled for this VirtualSpace.
253 size_t commit_granularity = (mode == Disable || !UseLargePages) ?
254 os::vm_page_size() : os::large_page_size();
255 EXPECT_LT(vs.actual_committed_size(), commit_size + commit_granularity);
256 }
257 }
258 };
259
260 TEST_VM(VirtualSpace, actual_committed_space) {
261 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(4 * K, 0));
262 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(4 * K, 4 * K));
263 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(8 * K, 0));
264 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(8 * K, 4 * K));
265 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(8 * K, 8 * K));
266 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(12 * K, 0));
267 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(12 * K, 4 * K));
268 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(12 * K, 8 * K));
269 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(12 * K, 12 * K));
270 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(64 * K, 0));
271 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(64 * K, 32 * K));
272 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(64 * K, 64 * K));
273 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(2 * M, 0));
274 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(2 * M, 4 * K));
275 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(2 * M, 64 * K));
276 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(2 * M, 1 * M));
277 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(2 * M, 2 * M));
278 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 0));
279 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 4 * K));
280 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 8 * K));
281 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 1 * M));
282 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 2 * M));
283 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 5 * M));
284 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 10 * M));
285 }
286
287 TEST_VM(VirtualSpace, actual_committed_space_one_large_page) {
288 if (!UseLargePages) {
289 return;
290 }
291
292 size_t large_page_size = os::large_page_size();
293
294 ReservedSpace reserved(large_page_size, large_page_size, true, false);
295 ReservedSpaceReleaser releaser(&reserved);
296 ASSERT_TRUE(reserved.is_reserved());
297
298 VirtualSpace vs;
299 ASSERT_TRUE(vs.initialize(reserved, 0)) << "Failed to initialize VirtualSpace";
300 vs.expand_by(large_page_size, false);
301
302 EXPECT_EQ(large_page_size, vs.actual_committed_size());
303 }
304
305 TEST_VM(VirtualSpace, disable_large_pages) {
306 if (!UseLargePages) {
307 return;
308 }
309 // These test cases verify that if we force VirtualSpace to disable large pages
310 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 0, Disable));
311 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 4 * K, Disable));
312 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 8 * K, Disable));
313 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 1 * M, Disable));
314 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 2 * M, Disable));
315 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 5 * M, Disable));
316 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 10 * M, Disable));
317
318 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 0, Reserve));
319 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 4 * K, Reserve));
320 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 8 * K, Reserve));
321 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 1 * M, Reserve));
322 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 2 * M, Reserve));
323 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 5 * M, Reserve));
324 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 10 * M, Reserve));
325
326 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 0, Commit));
327 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 4 * K, Commit));
328 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 8 * K, Commit));
329 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 1 * M, Commit));
330 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 2 * M, Commit));
331 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 5 * M, Commit));
332 EXPECT_NO_FATAL_FAILURE(test_virtual_space_actual_committed_space(10 * M, 10 * M, Commit));
333 }