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ext4: add test_mb_mark_used_cost to estimate cost of mb_mark_used

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Add test_mb_mark_used_cost to estimate cost of mb_mark_used

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20240424061904.987525-3-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2024-04-24 14:19:01 +08:00 committed by Theodore Ts'o
parent 9c97c34a99
commit d0b88624f8
1 changed files with 52 additions and 0 deletions
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52
fs/ext4/mballoc-test.c
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@ -883,6 +883,56 @@ static void test_mb_free_blocks(struct kunit *test)
ext4_mb_unload_buddy(&e4b);
}
#define COUNT_FOR_ESTIMATE 100000
static void test_mb_mark_used_cost(struct kunit *test)
{
struct ext4_buddy e4b;
struct super_block *sb = (struct super_block *)test->priv;
struct ext4_free_extent ex;
int ret;
struct test_range ranges[TEST_RANGE_COUNT];
int i, j;
unsigned long start, end, all = 0;
/* buddy cache assumes that each page contains at least one block */
if (sb->s_blocksize > PAGE_SIZE)
kunit_skip(test, "blocksize exceeds pagesize");
ret = ext4_mb_load_buddy(sb, TEST_GOAL_GROUP, &e4b);
KUNIT_ASSERT_EQ(test, ret, 0);
ex.fe_group = TEST_GOAL_GROUP;
for (j = 0; j < COUNT_FOR_ESTIMATE; j++) {
mbt_generate_test_ranges(sb, ranges, TEST_RANGE_COUNT);
start = jiffies;
for (i = 0; i < TEST_RANGE_COUNT; i++) {
if (ranges[i].len == 0)
continue;
ex.fe_start = ranges[i].start;
ex.fe_len = ranges[i].len;
ext4_lock_group(sb, TEST_GOAL_GROUP);
mb_mark_used(&e4b, &ex);
ext4_unlock_group(sb, TEST_GOAL_GROUP);
}
end = jiffies;
all += (end - start);
for (i = 0; i < TEST_RANGE_COUNT; i++) {
if (ranges[i].len == 0)
continue;
ext4_lock_group(sb, TEST_GOAL_GROUP);
mb_free_blocks(NULL, &e4b, ranges[i].start,
ranges[i].len);
ext4_unlock_group(sb, TEST_GOAL_GROUP);
}
}
kunit_info(test, "costed jiffies %lu\n", all);
ext4_mb_unload_buddy(&e4b);
}
static const struct mbt_ext4_block_layout mbt_test_layouts[] = {
{
.blocksize_bits = 10,
@ -925,6 +975,8 @@ static struct kunit_case mbt_test_cases[] = {
KUNIT_CASE_PARAM(test_mb_mark_used, mbt_layouts_gen_params),
KUNIT_CASE_PARAM(test_mb_free_blocks, mbt_layouts_gen_params),
KUNIT_CASE_PARAM(test_mark_diskspace_used, mbt_layouts_gen_params),
KUNIT_CASE_PARAM_ATTR(test_mb_mark_used_cost, mbt_layouts_gen_params,
{ .speed = KUNIT_SPEED_SLOW }),
{}
};