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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * Data Access Monitor Unit Tests | |
4 | * | |
5 | * Copyright 2019 Amazon.com, Inc. or its affiliates. All rights reserved. | |
6 | * | |
6ad59a38 | 7 | * Author: SeongJae Park <sj@kernel.org> |
17ccae8b SP |
8 | */ |
9 | ||
10 | #ifdef CONFIG_DAMON_VADDR_KUNIT_TEST | |
11 | ||
12 | #ifndef _DAMON_VADDR_TEST_H | |
13 | #define _DAMON_VADDR_TEST_H | |
14 | ||
15 | #include <kunit/test.h> | |
16 | ||
34403fa5 | 17 | static int __link_vmas(struct maple_tree *mt, struct vm_area_struct *vmas, |
d0cf3dd4 | 18 | ssize_t nr_vmas) |
17ccae8b | 19 | { |
34403fa5 | 20 | int i, ret = -ENOMEM; |
d0cf3dd4 | 21 | MA_STATE(mas, mt, 0, 0); |
17ccae8b SP |
22 | |
23 | if (!nr_vmas) | |
34403fa5 | 24 | return 0; |
17ccae8b | 25 | |
d0cf3dd4 | 26 | mas_lock(&mas); |
34403fa5 LH |
27 | for (i = 0; i < nr_vmas; i++) { |
28 | mas_set_range(&mas, vmas[i].vm_start, vmas[i].vm_end - 1); | |
29 | if (mas_store_gfp(&mas, &vmas[i], GFP_KERNEL)) | |
30 | goto failed; | |
31 | } | |
32 | ||
33 | ret = 0; | |
34 | failed: | |
d0cf3dd4 | 35 | mas_unlock(&mas); |
34403fa5 | 36 | return ret; |
17ccae8b SP |
37 | } |
38 | ||
39 | /* | |
40 | * Test __damon_va_three_regions() function | |
41 | * | |
42 | * In case of virtual memory address spaces monitoring, DAMON converts the | |
43 | * complex and dynamic memory mappings of each target task to three | |
44 | * discontiguous regions which cover every mapped areas. However, the three | |
45 | * regions should not include the two biggest unmapped areas in the original | |
46 | * mapping, because the two biggest areas are normally the areas between 1) | |
47 | * heap and the mmap()-ed regions, and 2) the mmap()-ed regions and stack. | |
48 | * Because these two unmapped areas are very huge but obviously never accessed, | |
49 | * covering the region is just a waste. | |
50 | * | |
51 | * '__damon_va_three_regions() receives an address space of a process. It | |
52 | * first identifies the start of mappings, end of mappings, and the two biggest | |
53 | * unmapped areas. After that, based on the information, it constructs the | |
54 | * three regions and returns. For more detail, refer to the comment of | |
55 | * 'damon_init_regions_of()' function definition in 'mm/damon.c' file. | |
56 | * | |
57 | * For example, suppose virtual address ranges of 10-20, 20-25, 200-210, | |
58 | * 210-220, 300-305, and 307-330 (Other comments represent this mappings in | |
59 | * more short form: 10-20-25, 200-210-220, 300-305, 307-330) of a process are | |
60 | * mapped. To cover every mappings, the three regions should start with 10, | |
61 | * and end with 305. The process also has three unmapped areas, 25-200, | |
62 | * 220-300, and 305-307. Among those, 25-200 and 220-300 are the biggest two | |
63 | * unmapped areas, and thus it should be converted to three regions of 10-25, | |
64 | * 200-220, and 300-330. | |
65 | */ | |
66 | static void damon_test_three_regions_in_vmas(struct kunit *test) | |
67 | { | |
d0cf3dd4 | 68 | static struct mm_struct mm; |
17ccae8b SP |
69 | struct damon_addr_range regions[3] = {0,}; |
70 | /* 10-20-25, 200-210-220, 300-305, 307-330 */ | |
71 | struct vm_area_struct vmas[] = { | |
72 | (struct vm_area_struct) {.vm_start = 10, .vm_end = 20}, | |
73 | (struct vm_area_struct) {.vm_start = 20, .vm_end = 25}, | |
74 | (struct vm_area_struct) {.vm_start = 200, .vm_end = 210}, | |
75 | (struct vm_area_struct) {.vm_start = 210, .vm_end = 220}, | |
76 | (struct vm_area_struct) {.vm_start = 300, .vm_end = 305}, | |
77 | (struct vm_area_struct) {.vm_start = 307, .vm_end = 330}, | |
78 | }; | |
79 | ||
d0cf3dd4 | 80 | mt_init_flags(&mm.mm_mt, MM_MT_FLAGS); |
34403fa5 LH |
81 | if (__link_vmas(&mm.mm_mt, vmas, ARRAY_SIZE(vmas))) |
82 | kunit_skip(test, "Failed to create VMA tree"); | |
17ccae8b | 83 | |
d0cf3dd4 | 84 | __damon_va_three_regions(&mm, regions); |
17ccae8b SP |
85 | |
86 | KUNIT_EXPECT_EQ(test, 10ul, regions[0].start); | |
87 | KUNIT_EXPECT_EQ(test, 25ul, regions[0].end); | |
88 | KUNIT_EXPECT_EQ(test, 200ul, regions[1].start); | |
89 | KUNIT_EXPECT_EQ(test, 220ul, regions[1].end); | |
90 | KUNIT_EXPECT_EQ(test, 300ul, regions[2].start); | |
91 | KUNIT_EXPECT_EQ(test, 330ul, regions[2].end); | |
92 | } | |
93 | ||
94 | static struct damon_region *__nth_region_of(struct damon_target *t, int idx) | |
95 | { | |
96 | struct damon_region *r; | |
97 | unsigned int i = 0; | |
98 | ||
99 | damon_for_each_region(r, t) { | |
100 | if (i++ == idx) | |
101 | return r; | |
102 | } | |
103 | ||
104 | return NULL; | |
105 | } | |
106 | ||
107 | /* | |
dae0087a | 108 | * Test 'damon_set_regions()' |
17ccae8b SP |
109 | * |
110 | * test kunit object | |
111 | * regions an array containing start/end addresses of current | |
112 | * monitoring target regions | |
113 | * nr_regions the number of the addresses in 'regions' | |
114 | * three_regions The three regions that need to be applied now | |
115 | * expected start/end addresses of monitoring target regions that | |
116 | * 'three_regions' are applied | |
117 | * nr_expected the number of addresses in 'expected' | |
118 | * | |
119 | * The memory mapping of the target processes changes dynamically. To follow | |
120 | * the change, DAMON periodically reads the mappings, simplifies it to the | |
121 | * three regions, and updates the monitoring target regions to fit in the three | |
122 | * regions. The update of current target regions is the role of | |
dae0087a | 123 | * 'damon_set_regions()'. |
17ccae8b SP |
124 | * |
125 | * This test passes the given target regions and the new three regions that | |
126 | * need to be applied to the function and check whether it updates the regions | |
127 | * as expected. | |
128 | */ | |
129 | static void damon_do_test_apply_three_regions(struct kunit *test, | |
130 | unsigned long *regions, int nr_regions, | |
131 | struct damon_addr_range *three_regions, | |
132 | unsigned long *expected, int nr_expected) | |
133 | { | |
17ccae8b SP |
134 | struct damon_target *t; |
135 | struct damon_region *r; | |
136 | int i; | |
137 | ||
1971bd63 | 138 | t = damon_new_target(); |
17ccae8b SP |
139 | for (i = 0; i < nr_regions / 2; i++) { |
140 | r = damon_new_region(regions[i * 2], regions[i * 2 + 1]); | |
141 | damon_add_region(r, t); | |
142 | } | |
17ccae8b | 143 | |
dae0087a | 144 | damon_set_regions(t, three_regions, 3); |
17ccae8b SP |
145 | |
146 | for (i = 0; i < nr_expected / 2; i++) { | |
147 | r = __nth_region_of(t, i); | |
148 | KUNIT_EXPECT_EQ(test, r->ar.start, expected[i * 2]); | |
149 | KUNIT_EXPECT_EQ(test, r->ar.end, expected[i * 2 + 1]); | |
150 | } | |
45120b15 JR |
151 | |
152 | damon_destroy_target(t); | |
17ccae8b SP |
153 | } |
154 | ||
155 | /* | |
156 | * This function test most common case where the three big regions are only | |
157 | * slightly changed. Target regions should adjust their boundary (10-20-30, | |
158 | * 50-55, 70-80, 90-100) to fit with the new big regions or remove target | |
159 | * regions (57-79) that now out of the three regions. | |
160 | */ | |
161 | static void damon_test_apply_three_regions1(struct kunit *test) | |
162 | { | |
163 | /* 10-20-30, 50-55-57-59, 70-80-90-100 */ | |
164 | unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59, | |
165 | 70, 80, 80, 90, 90, 100}; | |
166 | /* 5-27, 45-55, 73-104 */ | |
167 | struct damon_addr_range new_three_regions[3] = { | |
168 | (struct damon_addr_range){.start = 5, .end = 27}, | |
169 | (struct damon_addr_range){.start = 45, .end = 55}, | |
170 | (struct damon_addr_range){.start = 73, .end = 104} }; | |
171 | /* 5-20-27, 45-55, 73-80-90-104 */ | |
172 | unsigned long expected[] = {5, 20, 20, 27, 45, 55, | |
173 | 73, 80, 80, 90, 90, 104}; | |
174 | ||
175 | damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions), | |
176 | new_three_regions, expected, ARRAY_SIZE(expected)); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Test slightly bigger change. Similar to above, but the second big region | |
181 | * now require two target regions (50-55, 57-59) to be removed. | |
182 | */ | |
183 | static void damon_test_apply_three_regions2(struct kunit *test) | |
184 | { | |
185 | /* 10-20-30, 50-55-57-59, 70-80-90-100 */ | |
186 | unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59, | |
187 | 70, 80, 80, 90, 90, 100}; | |
188 | /* 5-27, 56-57, 65-104 */ | |
189 | struct damon_addr_range new_three_regions[3] = { | |
190 | (struct damon_addr_range){.start = 5, .end = 27}, | |
191 | (struct damon_addr_range){.start = 56, .end = 57}, | |
192 | (struct damon_addr_range){.start = 65, .end = 104} }; | |
193 | /* 5-20-27, 56-57, 65-80-90-104 */ | |
194 | unsigned long expected[] = {5, 20, 20, 27, 56, 57, | |
195 | 65, 80, 80, 90, 90, 104}; | |
196 | ||
197 | damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions), | |
198 | new_three_regions, expected, ARRAY_SIZE(expected)); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Test a big change. The second big region has totally freed and mapped to | |
203 | * different area (50-59 -> 61-63). The target regions which were in the old | |
204 | * second big region (50-55-57-59) should be removed and new target region | |
205 | * covering the second big region (61-63) should be created. | |
206 | */ | |
207 | static void damon_test_apply_three_regions3(struct kunit *test) | |
208 | { | |
209 | /* 10-20-30, 50-55-57-59, 70-80-90-100 */ | |
210 | unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59, | |
211 | 70, 80, 80, 90, 90, 100}; | |
212 | /* 5-27, 61-63, 65-104 */ | |
213 | struct damon_addr_range new_three_regions[3] = { | |
214 | (struct damon_addr_range){.start = 5, .end = 27}, | |
215 | (struct damon_addr_range){.start = 61, .end = 63}, | |
216 | (struct damon_addr_range){.start = 65, .end = 104} }; | |
217 | /* 5-20-27, 61-63, 65-80-90-104 */ | |
218 | unsigned long expected[] = {5, 20, 20, 27, 61, 63, | |
219 | 65, 80, 80, 90, 90, 104}; | |
220 | ||
221 | damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions), | |
222 | new_three_regions, expected, ARRAY_SIZE(expected)); | |
223 | } | |
224 | ||
225 | /* | |
226 | * Test another big change. Both of the second and third big regions (50-59 | |
227 | * and 70-100) has totally freed and mapped to different area (30-32 and | |
228 | * 65-68). The target regions which were in the old second and third big | |
229 | * regions should now be removed and new target regions covering the new second | |
01078655 | 230 | * and third big regions should be created. |
17ccae8b SP |
231 | */ |
232 | static void damon_test_apply_three_regions4(struct kunit *test) | |
233 | { | |
234 | /* 10-20-30, 50-55-57-59, 70-80-90-100 */ | |
235 | unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59, | |
236 | 70, 80, 80, 90, 90, 100}; | |
237 | /* 5-7, 30-32, 65-68 */ | |
238 | struct damon_addr_range new_three_regions[3] = { | |
239 | (struct damon_addr_range){.start = 5, .end = 7}, | |
240 | (struct damon_addr_range){.start = 30, .end = 32}, | |
241 | (struct damon_addr_range){.start = 65, .end = 68} }; | |
242 | /* expect 5-7, 30-32, 65-68 */ | |
243 | unsigned long expected[] = {5, 7, 30, 32, 65, 68}; | |
244 | ||
245 | damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions), | |
246 | new_three_regions, expected, ARRAY_SIZE(expected)); | |
247 | } | |
248 | ||
044cd975 SP |
249 | static void damon_test_split_evenly_fail(struct kunit *test, |
250 | unsigned long start, unsigned long end, unsigned int nr_pieces) | |
17ccae8b | 251 | { |
1971bd63 | 252 | struct damon_target *t = damon_new_target(); |
044cd975 | 253 | struct damon_region *r = damon_new_region(start, end); |
17ccae8b SP |
254 | |
255 | damon_add_region(r, t); | |
044cd975 SP |
256 | KUNIT_EXPECT_EQ(test, |
257 | damon_va_evenly_split_region(t, r, nr_pieces), -EINVAL); | |
258 | KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1u); | |
17ccae8b | 259 | |
17ccae8b | 260 | damon_for_each_region(r, t) { |
044cd975 SP |
261 | KUNIT_EXPECT_EQ(test, r->ar.start, start); |
262 | KUNIT_EXPECT_EQ(test, r->ar.end, end); | |
17ccae8b | 263 | } |
044cd975 | 264 | |
17ccae8b | 265 | damon_free_target(t); |
044cd975 SP |
266 | } |
267 | ||
268 | static void damon_test_split_evenly_succ(struct kunit *test, | |
269 | unsigned long start, unsigned long end, unsigned int nr_pieces) | |
270 | { | |
1971bd63 | 271 | struct damon_target *t = damon_new_target(); |
044cd975 SP |
272 | struct damon_region *r = damon_new_region(start, end); |
273 | unsigned long expected_width = (end - start) / nr_pieces; | |
274 | unsigned long i = 0; | |
17ccae8b | 275 | |
17ccae8b | 276 | damon_add_region(r, t); |
044cd975 SP |
277 | KUNIT_EXPECT_EQ(test, |
278 | damon_va_evenly_split_region(t, r, nr_pieces), 0); | |
279 | KUNIT_EXPECT_EQ(test, damon_nr_regions(t), nr_pieces); | |
17ccae8b | 280 | |
17ccae8b | 281 | damon_for_each_region(r, t) { |
1f4910b3 XT |
282 | if (i == nr_pieces - 1) { |
283 | KUNIT_EXPECT_EQ(test, | |
284 | r->ar.start, start + i * expected_width); | |
285 | KUNIT_EXPECT_EQ(test, r->ar.end, end); | |
17ccae8b | 286 | break; |
1f4910b3 | 287 | } |
044cd975 SP |
288 | KUNIT_EXPECT_EQ(test, |
289 | r->ar.start, start + i++ * expected_width); | |
290 | KUNIT_EXPECT_EQ(test, r->ar.end, start + i * expected_width); | |
17ccae8b | 291 | } |
17ccae8b | 292 | damon_free_target(t); |
044cd975 | 293 | } |
17ccae8b | 294 | |
044cd975 SP |
295 | static void damon_test_split_evenly(struct kunit *test) |
296 | { | |
044cd975 SP |
297 | KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(NULL, NULL, 5), |
298 | -EINVAL); | |
299 | ||
300 | damon_test_split_evenly_fail(test, 0, 100, 0); | |
301 | damon_test_split_evenly_succ(test, 0, 100, 10); | |
302 | damon_test_split_evenly_succ(test, 5, 59, 5); | |
303 | damon_test_split_evenly_fail(test, 5, 6, 2); | |
17ccae8b SP |
304 | } |
305 | ||
306 | static struct kunit_case damon_test_cases[] = { | |
307 | KUNIT_CASE(damon_test_three_regions_in_vmas), | |
308 | KUNIT_CASE(damon_test_apply_three_regions1), | |
309 | KUNIT_CASE(damon_test_apply_three_regions2), | |
310 | KUNIT_CASE(damon_test_apply_three_regions3), | |
311 | KUNIT_CASE(damon_test_apply_three_regions4), | |
312 | KUNIT_CASE(damon_test_split_evenly), | |
313 | {}, | |
314 | }; | |
315 | ||
316 | static struct kunit_suite damon_test_suite = { | |
f7d911c3 | 317 | .name = "damon-operations", |
17ccae8b SP |
318 | .test_cases = damon_test_cases, |
319 | }; | |
320 | kunit_test_suite(damon_test_suite); | |
321 | ||
322 | #endif /* _DAMON_VADDR_TEST_H */ | |
323 | ||
324 | #endif /* CONFIG_DAMON_VADDR_KUNIT_TEST */ |