diff options
Diffstat (limited to 'mm/damon/vaddr-test.h')
| -rw-r--r-- | mm/damon/vaddr-test.h | 324 |
1 files changed, 0 insertions, 324 deletions
diff --git a/mm/damon/vaddr-test.h b/mm/damon/vaddr-test.h deleted file mode 100644 index 83626483f82b..000000000000 --- a/mm/damon/vaddr-test.h +++ /dev/null @@ -1,324 +0,0 @@ -/* 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 <sj@kernel.org> - */ - -#ifdef CONFIG_DAMON_VADDR_KUNIT_TEST - -#ifndef _DAMON_VADDR_TEST_H -#define _DAMON_VADDR_TEST_H - -#include <kunit/test.h> - -static int __link_vmas(struct maple_tree *mt, struct vm_area_struct *vmas, - ssize_t nr_vmas) -{ - int i, ret = -ENOMEM; - MA_STATE(mas, mt, 0, 0); - - if (!nr_vmas) - return 0; - - mas_lock(&mas); - for (i = 0; i < nr_vmas; i++) { - mas_set_range(&mas, vmas[i].vm_start, vmas[i].vm_end - 1); - if (mas_store_gfp(&mas, &vmas[i], GFP_KERNEL)) - goto failed; - } - - ret = 0; -failed: - mas_unlock(&mas); - return ret; -} - -/* - * 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); - if (__link_vmas(&mm.mm_mt, vmas, ARRAY_SIZE(vmas))) - kunit_skip(test, "Failed to create VMA tree"); - - __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 */ |