The patch titled
Subject: selftests/mm: add tests for splitting pmd THPs to all lower orders
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-add-tests-for-splitting-pmd-thps-to-all-lower-orders.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-add-tests-for-splitting-pmd-thps-to-all-lower-orders.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: add tests for splitting pmd THPs to all lower orders
Date: Fri, 10 Jan 2025 18:50:28 -0500
Kernel already supports splitting a folio to any lower order. Test it.
Link: https://lkml.kernel.org/r/20250110235028.96824-2-ziy@xxxxxxxxxx
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Cc: Alexander Zhu <alexlzhu@xxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Usama Arif <usamaarif642@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/split_huge_page_test.c | 13 +++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
--- a/tools/testing/selftests/mm/split_huge_page_test.c~selftests-mm-add-tests-for-splitting-pmd-thps-to-all-lower-orders
+++ a/tools/testing/selftests/mm/split_huge_page_test.c
@@ -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+9+2+9);
pagesize = getpagesize();
pageshift = ffs(pagesize) - 1;
@@ -492,7 +492,10 @@ int main(int argc, char **argv)
fd_size = 2 * pmd_pagesize;
split_pmd_zero_pages();
- split_pmd_thp();
+
+ for (i = 0; i < 9; i++)
+ split_pmd_thp_to_order(i);
+
split_pte_mapped_thp();
split_file_backed_thp();
_
Patches currently in -mm which might be from ziy@xxxxxxxxxx are
selftests-mm-use-selftests-framework-to-print-test-result.patch
selftests-mm-add-tests-for-splitting-pmd-thps-to-all-lower-orders.patch
