1 /*
2 * Copyright © 2018 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 /* it is a test after all */
25 #undef NDEBUG
26
27 #include <algorithm>
28 #include <cassert>
29 #include <climits>
30 #include <cstdint>
31 #include <cstdio>
32 #include <cstdlib>
33 #include <random>
34 #include <set>
35 #include <vector>
36
37 #ifndef _WIN32
38 #include <err.h>
39 #else
40 #define errx(code, msg, ...) \
41 do { \
42 fprintf(stderr, msg, __VA_ARGS__); \
43 exit(code); \
44 } while (0);
45 #endif
46
47 #include "vma.h"
48
49 namespace {
50
51 static const uint64_t MEM_PAGE_SIZE = 4096;
52
53 struct allocation {
54 uint64_t start_page;
55 uint64_t num_pages;
56 };
57
58 struct allocation_less {
operator ()__anon8f73420f0111::allocation_less59 bool operator()(const allocation& lhs, const allocation& rhs) const
60 {
61 assert(lhs.start_page + lhs.num_pages > lhs.start_page);
62 return lhs.start_page + lhs.num_pages <= rhs.start_page;
63 }
64 };
65
allocation_end_page(const allocation & a)66 constexpr uint64_t allocation_end_page(const allocation& a) {
67 return a.start_page + a.num_pages;
68 }
69
70 struct random_test {
71 static const uint64_t MEM_START_PAGE = 1;
72 static const uint64_t MEM_SIZE = 0xfffffffffffff000;
73 static const uint64_t MEM_PAGES = MEM_SIZE / MEM_PAGE_SIZE;
74
random_test__anon8f73420f0111::random_test75 random_test(uint_fast32_t seed)
76 : heap_holes{allocation{MEM_START_PAGE, MEM_PAGES}}, rand{seed}
77 {
78 util_vma_heap_init(&heap, MEM_START_PAGE * MEM_PAGE_SIZE, MEM_SIZE);
79 }
80
test__anon8f73420f0111::random_test81 void test(unsigned long count)
82 {
83 std::uniform_int_distribution<> one_to_thousand(1, 1000);
84 while (count-- > 0) {
85 int action = one_to_thousand(rand);
86 if (action == 1) fill();
87 else if (action == 2) empty();
88 else if (action < 374) dealloc();
89 else alloc();
90 }
91 }
92
alloc__anon8f73420f0111::random_test93 bool alloc(uint64_t size_order=52, uint64_t align_order=52)
94 {
95 std::geometric_distribution<> dist;
96
97 if (align_order > 51)
98 align_order = std::min(dist(rand), 51);
99 uint64_t align_pages = 1ULL << align_order;
100 uint64_t align = align_pages * MEM_PAGE_SIZE;
101
102 if (size_order > 51)
103 size_order = std::min(dist(rand), 51);
104 uint64_t size_pages = 1ULL << size_order;
105 uint64_t size = size_pages * MEM_PAGE_SIZE;
106
107 uint64_t addr = util_vma_heap_alloc(&heap, size, align);
108
109 if (addr == 0) {
110 /* assert no gaps are present in the tracker that could satisfy this
111 * allocation.
112 */
113 for (const auto& hole : heap_holes) {
114 uint64_t hole_alignment_pages =
115 (align_pages - (hole.start_page % align_pages)) % align_pages;
116 assert(hole.num_pages < size_pages + hole_alignment_pages);
117 }
118 return false;
119 } else {
120 assert(addr % align == 0);
121 uint64_t addr_page = addr / MEM_PAGE_SIZE;
122 allocation a{addr_page, size_pages};
123 auto i = heap_holes.find(a);
124 assert(i != end(heap_holes));
125 allocation hole = *i;
126
127 assert(hole.start_page <= addr_page);
128 assert(hole.num_pages >= size_pages + addr_page - hole.start_page);
129
130 heap_holes.erase(i);
131 if (hole.start_page < a.start_page) {
132 heap_holes.emplace(allocation{hole.start_page,
133 a.start_page - hole.start_page});
134 }
135 if (allocation_end_page(hole) > allocation_end_page(a)) {
136 heap_holes.emplace(allocation{allocation_end_page(a),
137 allocation_end_page(hole) - allocation_end_page(a)});
138 }
139
140 allocations.push_back(a);
141 return true;
142 }
143 }
144
dealloc__anon8f73420f0111::random_test145 void dealloc()
146 {
147 if (allocations.size() == 0)
148 return;
149
150 std::uniform_int_distribution<> dist(0, allocations.size() - 1);
151 int to_dealloc = dist(rand);
152
153 std::swap(allocations.at(to_dealloc), allocations.back());
154 allocation a = allocations.back();
155 allocations.pop_back();
156
157 util_vma_heap_free(&heap, a.start_page * MEM_PAGE_SIZE,
158 a.num_pages * MEM_PAGE_SIZE);
159
160 assert(heap_holes.find(a) == end(heap_holes));
161 auto next = heap_holes.upper_bound(a);
162 if (next != end(heap_holes)) {
163 if (next->start_page == allocation_end_page(a)) {
164 allocation x {a.start_page, a.num_pages + next->num_pages};
165 next = heap_holes.erase(next);
166 next = heap_holes.insert(next, x);
167
168 if (next != begin(heap_holes)) {
169 auto prev = next;
170 prev--;
171 if (allocation_end_page(*prev) == next->start_page) {
172 allocation x {prev->start_page,
173 prev->num_pages + next->num_pages};
174
175 heap_holes.erase(prev);
176 next = heap_holes.erase(next);
177 heap_holes.insert(next, x);
178 }
179 }
180
181 return;
182 }
183 }
184
185 if (next != begin(heap_holes)) {
186 auto prev = next;
187 prev--;
188 if (allocation_end_page(*prev) == a.start_page) {
189 allocation x {prev->start_page, prev->num_pages + a.num_pages};
190 next = heap_holes.erase(prev);
191 heap_holes.insert(next, x);
192
193 return;
194 }
195 }
196
197 heap_holes.emplace(a);
198 }
199
fill__anon8f73420f0111::random_test200 void fill()
201 {
202 for (int sz = 51; sz >= 0; sz--) {
203 while (alloc(sz, 0))
204 ;
205 }
206 assert(heap_holes.empty());
207 }
208
empty__anon8f73420f0111::random_test209 void empty()
210 {
211 while (allocations.size() != 0)
212 dealloc();
213 assert(heap_holes.size() == 1);
214 auto& hole = *begin(heap_holes);
215 assert(hole.start_page == MEM_START_PAGE && hole.num_pages == MEM_PAGES);
216 }
217
218 struct util_vma_heap heap;
219 std::set<allocation, allocation_less> heap_holes;
220 std::default_random_engine rand;
221 std::vector<allocation> allocations;
222 };
223
224 }
225
main(int argc,char ** argv)226 int main(int argc, char **argv)
227 {
228 unsigned long seed, count;
229 if (argc == 3) {
230 char *arg_end = NULL;
231 seed = strtoul(argv[1], &arg_end, 0);
232 if (!arg_end || *arg_end || seed == ULONG_MAX)
233 errx(1, "invalid seed \"%s\"", argv[1]);
234
235 arg_end = NULL;
236 count = strtoul(argv[2], &arg_end, 0);
237 if (!arg_end || *arg_end || count == ULONG_MAX)
238 errx(1, "invalid count \"%s\"", argv[2]);
239 } else if (argc == 1) {
240 /* importantly chosen prime numbers. */
241 seed = 8675309;
242 count = 2459;
243 } else {
244 errx(1, "USAGE: %s seed iter_count\n", argv[0]);
245 }
246
247 random_test r{(uint_fast32_t)seed};
248 r.test(count);
249
250 printf("ok\n");
251 return 0;
252 }
253