linux-kernel - [PATCH v2 3/3] selftests/mm: test splitting file-backed THP to any lower order.

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Message-ID: <20250122161928.1240637-3-ziy@nvidia.com>
Date: Wed, 22 Jan 2025 11:19:28 -0500
From: Zi Yan <ziy@...dia.com>
To: linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	David Hildenbrand <david@...hat.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Hugh Dickins <hughd@...gle.com>,
	Yang Shi <yang@...amperecomputing.com>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Yu Zhao <yuzhao@...gle.com>,
	John Hubbard <jhubbard@...dia.com>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Zi Yan <ziy@...dia.com>
Subject: [PATCH v2 3/3] selftests/mm: test splitting file-backed THP to any lower order.

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.

Signed-off-by: Zi Yan <ziy@...dia.com>
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
Tested-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 tools/testing/selftests/mm/split_huge_page_test.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c
index ba498aaaf857..e0304046b1a0 100644
--- a/tools/testing/selftests/mm/split_huge_page_test.c
+++ b/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);
-- 
2.45.2