/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Data Access Monitor Unit Tests
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*
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* Copyright 2019 Amazon.com, Inc. or its affiliates. All rights reserved.
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*
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* Author: SeongJae Park <sjpark@amazon.de>
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*/
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#ifdef CONFIG_DAMON_KUNIT_TEST
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#ifndef _DAMON_CORE_TEST_H
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#define _DAMON_CORE_TEST_H
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#include <kunit/test.h>
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static void damon_test_regions(struct kunit *test)
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{
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struct damon_region *r;
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struct damon_target *t;
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r = damon_new_region(1, 2);
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KUNIT_EXPECT_EQ(test, 1ul, r->ar.start);
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KUNIT_EXPECT_EQ(test, 2ul, r->ar.end);
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KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
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t = damon_new_target(42);
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KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
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damon_add_region(r, t);
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KUNIT_EXPECT_EQ(test, 1u, damon_nr_regions(t));
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damon_del_region(r, t);
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KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
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damon_free_target(t);
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}
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static unsigned int nr_damon_targets(struct damon_ctx *ctx)
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{
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struct damon_target *t;
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unsigned int nr_targets = 0;
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damon_for_each_target(t, ctx)
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nr_targets++;
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return nr_targets;
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}
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static void damon_test_target(struct kunit *test)
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{
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struct damon_ctx *c = damon_new_ctx();
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struct damon_target *t;
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t = damon_new_target(42);
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KUNIT_EXPECT_EQ(test, 42ul, t->id);
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KUNIT_EXPECT_EQ(test, 0u, nr_damon_targets(c));
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damon_add_target(c, t);
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KUNIT_EXPECT_EQ(test, 1u, nr_damon_targets(c));
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damon_destroy_target(t);
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KUNIT_EXPECT_EQ(test, 0u, nr_damon_targets(c));
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damon_destroy_ctx(c);
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}
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/*
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* Test kdamond_reset_aggregated()
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*
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* DAMON checks access to each region and aggregates this information as the
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* access frequency of each region. In detail, it increases '->nr_accesses' of
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* regions that an access has confirmed. 'kdamond_reset_aggregated()' flushes
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* the aggregated information ('->nr_accesses' of each regions) to the result
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* buffer. As a result of the flushing, the '->nr_accesses' of regions are
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* initialized to zero.
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*/
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static void damon_test_aggregate(struct kunit *test)
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{
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struct damon_ctx *ctx = damon_new_ctx();
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unsigned long target_ids[] = {1, 2, 3};
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unsigned long saddr[][3] = {{10, 20, 30}, {5, 42, 49}, {13, 33, 55} };
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unsigned long eaddr[][3] = {{15, 27, 40}, {31, 45, 55}, {23, 44, 66} };
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unsigned long accesses[][3] = {{42, 95, 84}, {10, 20, 30}, {0, 1, 2} };
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struct damon_target *t;
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struct damon_region *r;
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int it, ir;
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damon_set_targets(ctx, target_ids, 3);
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it = 0;
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damon_for_each_target(t, ctx) {
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for (ir = 0; ir < 3; ir++) {
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r = damon_new_region(saddr[it][ir], eaddr[it][ir]);
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r->nr_accesses = accesses[it][ir];
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damon_add_region(r, t);
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}
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it++;
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}
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kdamond_reset_aggregated(ctx);
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it = 0;
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damon_for_each_target(t, ctx) {
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ir = 0;
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/* '->nr_accesses' should be zeroed */
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damon_for_each_region(r, t) {
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KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
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ir++;
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}
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/* regions should be preserved */
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KUNIT_EXPECT_EQ(test, 3, ir);
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it++;
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}
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/* targets also should be preserved */
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KUNIT_EXPECT_EQ(test, 3, it);
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damon_destroy_ctx(ctx);
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}
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static void damon_test_split_at(struct kunit *test)
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{
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struct damon_ctx *c = damon_new_ctx();
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struct damon_target *t;
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struct damon_region *r;
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t = damon_new_target(42);
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r = damon_new_region(0, 100);
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damon_add_region(r, t);
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damon_split_region_at(c, t, r, 25);
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KUNIT_EXPECT_EQ(test, r->ar.start, 0ul);
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KUNIT_EXPECT_EQ(test, r->ar.end, 25ul);
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r = damon_next_region(r);
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KUNIT_EXPECT_EQ(test, r->ar.start, 25ul);
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KUNIT_EXPECT_EQ(test, r->ar.end, 100ul);
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damon_free_target(t);
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damon_destroy_ctx(c);
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}
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static void damon_test_merge_two(struct kunit *test)
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{
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struct damon_target *t;
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struct damon_region *r, *r2, *r3;
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int i;
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t = damon_new_target(42);
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r = damon_new_region(0, 100);
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r->nr_accesses = 10;
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damon_add_region(r, t);
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r2 = damon_new_region(100, 300);
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r2->nr_accesses = 20;
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damon_add_region(r2, t);
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damon_merge_two_regions(t, r, r2);
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KUNIT_EXPECT_EQ(test, r->ar.start, 0ul);
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KUNIT_EXPECT_EQ(test, r->ar.end, 300ul);
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KUNIT_EXPECT_EQ(test, r->nr_accesses, 16u);
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i = 0;
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damon_for_each_region(r3, t) {
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KUNIT_EXPECT_PTR_EQ(test, r, r3);
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i++;
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}
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KUNIT_EXPECT_EQ(test, i, 1);
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damon_free_target(t);
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}
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static struct damon_region *__nth_region_of(struct damon_target *t, int idx)
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{
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struct damon_region *r;
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unsigned int i = 0;
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damon_for_each_region(r, t) {
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if (i++ == idx)
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return r;
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}
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return NULL;
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}
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static void damon_test_merge_regions_of(struct kunit *test)
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{
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struct damon_target *t;
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struct damon_region *r;
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unsigned long sa[] = {0, 100, 114, 122, 130, 156, 170, 184};
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unsigned long ea[] = {100, 112, 122, 130, 156, 170, 184, 230};
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unsigned int nrs[] = {0, 0, 10, 10, 20, 30, 1, 2};
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unsigned long saddrs[] = {0, 114, 130, 156, 170};
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unsigned long eaddrs[] = {112, 130, 156, 170, 230};
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int i;
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t = damon_new_target(42);
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for (i = 0; i < ARRAY_SIZE(sa); i++) {
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r = damon_new_region(sa[i], ea[i]);
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r->nr_accesses = nrs[i];
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damon_add_region(r, t);
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}
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damon_merge_regions_of(t, 9, 9999);
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/* 0-112, 114-130, 130-156, 156-170 */
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KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 5u);
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for (i = 0; i < 5; i++) {
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r = __nth_region_of(t, i);
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KUNIT_EXPECT_EQ(test, r->ar.start, saddrs[i]);
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KUNIT_EXPECT_EQ(test, r->ar.end, eaddrs[i]);
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}
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damon_free_target(t);
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}
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static void damon_test_split_regions_of(struct kunit *test)
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{
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struct damon_ctx *c = damon_new_ctx();
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struct damon_target *t;
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struct damon_region *r;
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t = damon_new_target(42);
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r = damon_new_region(0, 22);
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damon_add_region(r, t);
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damon_split_regions_of(c, t, 2);
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KUNIT_EXPECT_LE(test, damon_nr_regions(t), 2u);
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damon_free_target(t);
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t = damon_new_target(42);
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r = damon_new_region(0, 220);
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damon_add_region(r, t);
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damon_split_regions_of(c, t, 4);
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KUNIT_EXPECT_LE(test, damon_nr_regions(t), 4u);
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damon_free_target(t);
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damon_destroy_ctx(c);
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}
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static struct kunit_case damon_test_cases[] = {
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KUNIT_CASE(damon_test_target),
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KUNIT_CASE(damon_test_regions),
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KUNIT_CASE(damon_test_aggregate),
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KUNIT_CASE(damon_test_split_at),
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KUNIT_CASE(damon_test_merge_two),
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KUNIT_CASE(damon_test_merge_regions_of),
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KUNIT_CASE(damon_test_split_regions_of),
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{},
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};
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static struct kunit_suite damon_test_suite = {
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.name = "damon",
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.test_cases = damon_test_cases,
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};
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kunit_test_suite(damon_test_suite);
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#endif /* _DAMON_CORE_TEST_H */
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#endif /* CONFIG_DAMON_KUNIT_TEST */
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