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This works on systems with smaller PMD page sizes, > but fails on configurations where the PMD huge page size is > larger (e.g. 16MB). > > On such systems, the fixed 4MB tmpfs is insufficient to allocate even > a single PMD-sized THP, causing the test to fail. > > Fix this by sizing the tmpfs dynamically based on the runtime > pmd_pagesize, allocating space for two PMD-sized pages. > > Before patch: > running ./split_huge_page_test /tmp/xfs_dir_YTrI5E > -------------------------------------------------- > TAP version 13 > 1..55 > ok 1 Split zero filled huge pages successful > ok 2 Split huge pages to order 0 successful > ok 3 Split huge pages to order 2 successful > ok 4 Split huge pages to order 3 successful > ok 5 Split huge pages to order 4 successful > ok 6 Split huge pages to order 5 successful > ok 7 Split huge pages to order 6 successful > ok 8 Split huge pages to order 7 successful > ok 9 Split PTE-mapped huge pages successful > Please enable pr_debug in split_huge_pages_in_file() for more info. > Failed to write data to testing file: Success (0) > Bail out! Error occurred > Planned tests != run tests (55 != 9) > Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0 > [FAIL] > > After patch: > -------------------------------------------------- > running ./split_huge_page_test /tmp/xfs_dir_bMvj6o > -------------------------------------------------- > TAP version 13 > 1..55 > ok 1 Split zero filled huge pages successful > ok 2 Split huge pages to order 0 successful > ok 3 Split huge pages to order 2 successful > ok 4 Split huge pages to order 3 successful > ok 5 Split huge pages to order 4 successful > ok 6 Split huge pages to order 5 successful > ok 7 Split huge pages to order 6 successful > ok 8 Split huge pages to order 7 successful > ok 9 Split PTE-mapped huge pages successful > Please enable pr_debug in split_huge_pages_in_file() for more info. > Please check dmesg for more information > ok 10 File-backed THP split to order 0 test done > Please enable pr_debug in split_huge_pages_in_file() for more info. > Please check dmesg for more information > ok 11 File-backed THP split to order 1 test done > Please enable pr_debug in split_huge_pages_in_file() for more info. > Please check dmesg for more information > ok 12 File-backed THP split to order 2 test done > ... > ok 55 Split PMD-mapped pagecache folio to order 7 at > in-folio offset 128 passed > Totals: pass:55 fail:0 xfail:0 xpass:0 skip:0 error:0 > [PASS] > ok 1 split_huge_page_test /tmp/xfs_dir_bMvj6o > > Fixes: fbe37501b252 ("mm: huge_memory: debugfs for file-backed THP split") > Signed-off-by: Sayali Patil > --- > tools/testing/selftests/mm/split_huge_page_test.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > Thanks for fixing it. Reviewed-by: Zi Yan Best Regards, Yan, Zi