The patch titled
Subject: selftests/mm: test splitting file-backed THP to any lower order.
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: selftests/mm: test splitting file-backed THP to any lower order.
Date: Wed, 22 Jan 2025 11:19:28 -0500
Now split_huge_page*() supports shmem THP split to any lower order. Test
it.
The test now reads file content out after split to check if the split
corrupts the file data.
Link: https://lkml.kernel.org/r/20250122161928.1240637-3-ziy@xxxxxxxxxx
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Tested-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickens <hughd@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Kirill A. Shuemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: linmiaohe <linmiaohe@xxxxxxxxxx>
Cc: Mattew Wilcox <willy@xxxxxxxxxxxxx> [English fixes]
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/split_huge_page_test.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/tools/testing/selftests/mm/split_huge_page_test.c~selftests-mm-test-splitting-file-backed-thp-to-any-lower-order
+++ a/tools/testing/selftests/mm/split_huge_page_test.c
@@ -261,7 +261,7 @@ void split_pte_mapped_thp(void)
close(kpageflags_fd);
}
-void split_file_backed_thp(void)
+void split_file_backed_thp(int order)
{
int status;
int fd;
@@ -313,7 +313,7 @@ void split_file_backed_thp(void)
}
/* split the file-backed THP */
- write_debugfs(PATH_FMT, testfile, pgoff_start, pgoff_end, 0);
+ write_debugfs(PATH_FMT, testfile, pgoff_start, pgoff_end, order);
/* check file content after split */
status = lseek(fd, 0, SEEK_SET);
@@ -351,7 +351,7 @@ void split_file_backed_thp(void)
ksft_exit_fail_msg("cannot remove tmp dir: %s\n", strerror(errno));
ksft_print_msg("Please check dmesg for more information\n");
- ksft_test_result_pass("File-backed THP split test done\n");
+ ksft_test_result_pass("File-backed THP split to order %d test done\n", order);
return;
close_file:
@@ -517,7 +517,7 @@ int main(int argc, char **argv)
if (argc > 1)
optional_xfs_path = argv[1];
- ksft_set_plan(1+8+2+9);
+ ksft_set_plan(1+8+1+9+9);
pagesize = getpagesize();
pageshift = ffs(pagesize) - 1;
@@ -534,7 +534,8 @@ int main(int argc, char **argv)
split_pmd_thp_to_order(i);
split_pte_mapped_thp();
- split_file_backed_thp();
+ for (i = 0; i < 9; i++)
+ split_file_backed_thp(i);
created_tmp = prepare_thp_fs(optional_xfs_path, fs_loc_template,
&fs_loc);
_
Patches currently in -mm which might be from ziy@xxxxxxxxxx are
selftests-mm-make-file-backed-thp-split-work-by-writing-pmd-size-data.patch
mm-huge_memory-allow-split-shmem-large-folio-to-any-lower-order.patch
selftests-mm-test-splitting-file-backed-thp-to-any-lower-order.patch
