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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Data Access Monitor Unit Tests
- *
- * Copyright 2019 Amazon.com, Inc. or its affiliates. All rights reserved.
- *
- * Author: SeongJae Park <[email protected]>
- */
- #ifdef CONFIG_DAMON_VADDR_KUNIT_TEST
- #ifndef _DAMON_VADDR_TEST_H
- #define _DAMON_VADDR_TEST_H
- #include <kunit/test.h>
- static void __link_vmas(struct maple_tree *mt, struct vm_area_struct *vmas,
- ssize_t nr_vmas)
- {
- int i;
- MA_STATE(mas, mt, 0, 0);
- if (!nr_vmas)
- return;
- mas_lock(&mas);
- for (i = 0; i < nr_vmas; i++)
- vma_mas_store(&vmas[i], &mas);
- mas_unlock(&mas);
- }
- /*
- * Test __damon_va_three_regions() function
- *
- * In case of virtual memory address spaces monitoring, DAMON converts the
- * complex and dynamic memory mappings of each target task to three
- * discontiguous regions which cover every mapped areas. However, the three
- * regions should not include the two biggest unmapped areas in the original
- * mapping, because the two biggest areas are normally the areas between 1)
- * heap and the mmap()-ed regions, and 2) the mmap()-ed regions and stack.
- * Because these two unmapped areas are very huge but obviously never accessed,
- * covering the region is just a waste.
- *
- * '__damon_va_three_regions() receives an address space of a process. It
- * first identifies the start of mappings, end of mappings, and the two biggest
- * unmapped areas. After that, based on the information, it constructs the
- * three regions and returns. For more detail, refer to the comment of
- * 'damon_init_regions_of()' function definition in 'mm/damon.c' file.
- *
- * For example, suppose virtual address ranges of 10-20, 20-25, 200-210,
- * 210-220, 300-305, and 307-330 (Other comments represent this mappings in
- * more short form: 10-20-25, 200-210-220, 300-305, 307-330) of a process are
- * mapped. To cover every mappings, the three regions should start with 10,
- * and end with 305. The process also has three unmapped areas, 25-200,
- * 220-300, and 305-307. Among those, 25-200 and 220-300 are the biggest two
- * unmapped areas, and thus it should be converted to three regions of 10-25,
- * 200-220, and 300-330.
- */
- static void damon_test_three_regions_in_vmas(struct kunit *test)
- {
- static struct mm_struct mm;
- struct damon_addr_range regions[3] = {0,};
- /* 10-20-25, 200-210-220, 300-305, 307-330 */
- struct vm_area_struct vmas[] = {
- (struct vm_area_struct) {.vm_start = 10, .vm_end = 20},
- (struct vm_area_struct) {.vm_start = 20, .vm_end = 25},
- (struct vm_area_struct) {.vm_start = 200, .vm_end = 210},
- (struct vm_area_struct) {.vm_start = 210, .vm_end = 220},
- (struct vm_area_struct) {.vm_start = 300, .vm_end = 305},
- (struct vm_area_struct) {.vm_start = 307, .vm_end = 330},
- };
- mt_init_flags(&mm.mm_mt, MM_MT_FLAGS);
- __link_vmas(&mm.mm_mt, vmas, ARRAY_SIZE(vmas));
- __damon_va_three_regions(&mm, regions);
- KUNIT_EXPECT_EQ(test, 10ul, regions[0].start);
- KUNIT_EXPECT_EQ(test, 25ul, regions[0].end);
- KUNIT_EXPECT_EQ(test, 200ul, regions[1].start);
- KUNIT_EXPECT_EQ(test, 220ul, regions[1].end);
- KUNIT_EXPECT_EQ(test, 300ul, regions[2].start);
- KUNIT_EXPECT_EQ(test, 330ul, regions[2].end);
- }
- static struct damon_region *__nth_region_of(struct damon_target *t, int idx)
- {
- struct damon_region *r;
- unsigned int i = 0;
- damon_for_each_region(r, t) {
- if (i++ == idx)
- return r;
- }
- return NULL;
- }
- /*
- * Test 'damon_set_regions()'
- *
- * test kunit object
- * regions an array containing start/end addresses of current
- * monitoring target regions
- * nr_regions the number of the addresses in 'regions'
- * three_regions The three regions that need to be applied now
- * expected start/end addresses of monitoring target regions that
- * 'three_regions' are applied
- * nr_expected the number of addresses in 'expected'
- *
- * The memory mapping of the target processes changes dynamically. To follow
- * the change, DAMON periodically reads the mappings, simplifies it to the
- * three regions, and updates the monitoring target regions to fit in the three
- * regions. The update of current target regions is the role of
- * 'damon_set_regions()'.
- *
- * This test passes the given target regions and the new three regions that
- * need to be applied to the function and check whether it updates the regions
- * as expected.
- */
- static void damon_do_test_apply_three_regions(struct kunit *test,
- unsigned long *regions, int nr_regions,
- struct damon_addr_range *three_regions,
- unsigned long *expected, int nr_expected)
- {
- struct damon_target *t;
- struct damon_region *r;
- int i;
- t = damon_new_target();
- for (i = 0; i < nr_regions / 2; i++) {
- r = damon_new_region(regions[i * 2], regions[i * 2 + 1]);
- damon_add_region(r, t);
- }
- damon_set_regions(t, three_regions, 3);
- for (i = 0; i < nr_expected / 2; i++) {
- r = __nth_region_of(t, i);
- KUNIT_EXPECT_EQ(test, r->ar.start, expected[i * 2]);
- KUNIT_EXPECT_EQ(test, r->ar.end, expected[i * 2 + 1]);
- }
- damon_destroy_target(t);
- }
- /*
- * This function test most common case where the three big regions are only
- * slightly changed. Target regions should adjust their boundary (10-20-30,
- * 50-55, 70-80, 90-100) to fit with the new big regions or remove target
- * regions (57-79) that now out of the three regions.
- */
- static void damon_test_apply_three_regions1(struct kunit *test)
- {
- /* 10-20-30, 50-55-57-59, 70-80-90-100 */
- unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
- 70, 80, 80, 90, 90, 100};
- /* 5-27, 45-55, 73-104 */
- struct damon_addr_range new_three_regions[3] = {
- (struct damon_addr_range){.start = 5, .end = 27},
- (struct damon_addr_range){.start = 45, .end = 55},
- (struct damon_addr_range){.start = 73, .end = 104} };
- /* 5-20-27, 45-55, 73-80-90-104 */
- unsigned long expected[] = {5, 20, 20, 27, 45, 55,
- 73, 80, 80, 90, 90, 104};
- damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
- new_three_regions, expected, ARRAY_SIZE(expected));
- }
- /*
- * Test slightly bigger change. Similar to above, but the second big region
- * now require two target regions (50-55, 57-59) to be removed.
- */
- static void damon_test_apply_three_regions2(struct kunit *test)
- {
- /* 10-20-30, 50-55-57-59, 70-80-90-100 */
- unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
- 70, 80, 80, 90, 90, 100};
- /* 5-27, 56-57, 65-104 */
- struct damon_addr_range new_three_regions[3] = {
- (struct damon_addr_range){.start = 5, .end = 27},
- (struct damon_addr_range){.start = 56, .end = 57},
- (struct damon_addr_range){.start = 65, .end = 104} };
- /* 5-20-27, 56-57, 65-80-90-104 */
- unsigned long expected[] = {5, 20, 20, 27, 56, 57,
- 65, 80, 80, 90, 90, 104};
- damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
- new_three_regions, expected, ARRAY_SIZE(expected));
- }
- /*
- * Test a big change. The second big region has totally freed and mapped to
- * different area (50-59 -> 61-63). The target regions which were in the old
- * second big region (50-55-57-59) should be removed and new target region
- * covering the second big region (61-63) should be created.
- */
- static void damon_test_apply_three_regions3(struct kunit *test)
- {
- /* 10-20-30, 50-55-57-59, 70-80-90-100 */
- unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
- 70, 80, 80, 90, 90, 100};
- /* 5-27, 61-63, 65-104 */
- struct damon_addr_range new_three_regions[3] = {
- (struct damon_addr_range){.start = 5, .end = 27},
- (struct damon_addr_range){.start = 61, .end = 63},
- (struct damon_addr_range){.start = 65, .end = 104} };
- /* 5-20-27, 61-63, 65-80-90-104 */
- unsigned long expected[] = {5, 20, 20, 27, 61, 63,
- 65, 80, 80, 90, 90, 104};
- damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
- new_three_regions, expected, ARRAY_SIZE(expected));
- }
- /*
- * Test another big change. Both of the second and third big regions (50-59
- * and 70-100) has totally freed and mapped to different area (30-32 and
- * 65-68). The target regions which were in the old second and third big
- * regions should now be removed and new target regions covering the new second
- * and third big regions should be created.
- */
- static void damon_test_apply_three_regions4(struct kunit *test)
- {
- /* 10-20-30, 50-55-57-59, 70-80-90-100 */
- unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
- 70, 80, 80, 90, 90, 100};
- /* 5-7, 30-32, 65-68 */
- struct damon_addr_range new_three_regions[3] = {
- (struct damon_addr_range){.start = 5, .end = 7},
- (struct damon_addr_range){.start = 30, .end = 32},
- (struct damon_addr_range){.start = 65, .end = 68} };
- /* expect 5-7, 30-32, 65-68 */
- unsigned long expected[] = {5, 7, 30, 32, 65, 68};
- damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
- new_three_regions, expected, ARRAY_SIZE(expected));
- }
- static void damon_test_split_evenly_fail(struct kunit *test,
- unsigned long start, unsigned long end, unsigned int nr_pieces)
- {
- struct damon_target *t = damon_new_target();
- struct damon_region *r = damon_new_region(start, end);
- damon_add_region(r, t);
- KUNIT_EXPECT_EQ(test,
- damon_va_evenly_split_region(t, r, nr_pieces), -EINVAL);
- KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1u);
- damon_for_each_region(r, t) {
- KUNIT_EXPECT_EQ(test, r->ar.start, start);
- KUNIT_EXPECT_EQ(test, r->ar.end, end);
- }
- damon_free_target(t);
- }
- static void damon_test_split_evenly_succ(struct kunit *test,
- unsigned long start, unsigned long end, unsigned int nr_pieces)
- {
- struct damon_target *t = damon_new_target();
- struct damon_region *r = damon_new_region(start, end);
- unsigned long expected_width = (end - start) / nr_pieces;
- unsigned long i = 0;
- damon_add_region(r, t);
- KUNIT_EXPECT_EQ(test,
- damon_va_evenly_split_region(t, r, nr_pieces), 0);
- KUNIT_EXPECT_EQ(test, damon_nr_regions(t), nr_pieces);
- damon_for_each_region(r, t) {
- if (i == nr_pieces - 1) {
- KUNIT_EXPECT_EQ(test,
- r->ar.start, start + i * expected_width);
- KUNIT_EXPECT_EQ(test, r->ar.end, end);
- break;
- }
- KUNIT_EXPECT_EQ(test,
- r->ar.start, start + i++ * expected_width);
- KUNIT_EXPECT_EQ(test, r->ar.end, start + i * expected_width);
- }
- damon_free_target(t);
- }
- static void damon_test_split_evenly(struct kunit *test)
- {
- KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(NULL, NULL, 5),
- -EINVAL);
- damon_test_split_evenly_fail(test, 0, 100, 0);
- damon_test_split_evenly_succ(test, 0, 100, 10);
- damon_test_split_evenly_succ(test, 5, 59, 5);
- damon_test_split_evenly_fail(test, 5, 6, 2);
- }
- static struct kunit_case damon_test_cases[] = {
- KUNIT_CASE(damon_test_three_regions_in_vmas),
- KUNIT_CASE(damon_test_apply_three_regions1),
- KUNIT_CASE(damon_test_apply_three_regions2),
- KUNIT_CASE(damon_test_apply_three_regions3),
- KUNIT_CASE(damon_test_apply_three_regions4),
- KUNIT_CASE(damon_test_split_evenly),
- {},
- };
- static struct kunit_suite damon_test_suite = {
- .name = "damon-operations",
- .test_cases = damon_test_cases,
- };
- kunit_test_suite(damon_test_suite);
- #endif /* _DAMON_VADDR_TEST_H */
- #endif /* CONFIG_DAMON_VADDR_KUNIT_TEST */
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