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linux/mm/damon/core-test.h
SeongJae Park 1971bd6304 mm/damon: remove the target id concept 
DAMON asks each monitoring target ('struct damon_target') to have one
'unsigned long' integer called 'id', which should be unique among the
targets of same monitoring context.  Meaning of it is, however, totally up
to the monitoring primitives that registered to the monitoring context.
For example, the virtual address spaces monitoring primitives treats the
id as a 'struct pid' pointer.

This makes the code flexible, but ugly, not well-documented, and
type-unsafe[1].  Also, identification of each target can be done via its
index.  For the reason, this commit removes the concept and uses clear
type definition.  For now, only 'struct pid' pointer is used for the
virtual address spaces monitoring.  If DAMON is extended in future so that
we need to put another identifier field in the struct, we will use a union
for such primitives-dependent fields and document which primitives are
using which type.

[1] https://lore.kernel.org/linux-mm/20211013154535.4aaeaaf9d0182922e405dd1e@linux-foundation.org/

Link: https://lkml.kernel.org/r/20211230100723.2238-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-03-22 15:57:12 -07:00

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