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selftests/mm: add tests for splitting pmd THPs to all lower orders

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Kernel already supports splitting a folio to any lower order. Test it.

[ziy@nvidia.com: no need to test splitting to order-1]
 Link: https://lkml.kernel.org/r/DDA202EA-4664-4F50-A7FD-B00CBB7A624B@nvidia.com
Link: https://lkml.kernel.org/r/20250110235028.96824-2-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Alexander Zhu <alexlzhu@fb.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Usama Arif <usamaarif642@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2025-01-10 18:50:28 -05:00 committed by Andrew Morton
parent 136c5b40e0
commit dfe61db4a1
1 changed files with 9 additions and 5 deletions
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14
tools/testing/selftests/mm/split_huge_page_test.c
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@ -144,7 +144,7 @@ void split_pmd_zero_pages(void)
free(one_page);
}
void split_pmd_thp(void)
void split_pmd_thp_to_order(int order)
{
char *one_page;
size_t len = 4 * pmd_pagesize;
@ -164,7 +164,7 @@ void split_pmd_thp(void)
/* split all THPs */
write_debugfs(PID_FMT, getpid(), (uint64_t)one_page,
(uint64_t)one_page + len, 0);
(uint64_t)one_page + len, order);
for (i = 0; i < len; i++)
if (one_page[i] != (char)i)
@ -174,7 +174,7 @@ void split_pmd_thp(void)
if (!check_huge_anon(one_page, 0, pmd_pagesize))
ksft_exit_fail_msg("Still AnonHugePages not split\n");
ksft_test_result_pass("Split huge pages successful\n");
ksft_test_result_pass("Split huge pages to order %d successful\n", order);
free(one_page);
}
@ -481,7 +481,7 @@ int main(int argc, char **argv)
if (argc > 1)
optional_xfs_path = argv[1];
ksft_set_plan(4+9);
ksft_set_plan(1+8+2+9);
pagesize = getpagesize();
pageshift = ffs(pagesize) - 1;
@ -492,7 +492,11 @@ int main(int argc, char **argv)
fd_size = 2 * pmd_pagesize;
split_pmd_zero_pages();
split_pmd_thp();
for (i = 0; i < 9; i++)
if (i != 1)
split_pmd_thp_to_order(i);
split_pte_mapped_thp();
split_file_backed_thp();