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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Peter Xu , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Shuah Khan , Jason Gunthorpe , Leon Romanovsky , Sarthak Sharma , Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5213; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=izQCU7IUhvJ7QRLLcnoy3tPOfrjmRr71yMTllFN+vlY=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqp6KyXsCpV93AkxG3X6hqxvw/KBfTNi9mgBjTH sVjdigSSmqJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCaqeisgAKCRBt1cPRWsUx MxKVC/96AgGeBKcHO8ZFEYTHoR7Hf2y9tgl5K51d+qp+Qu/iSmXNHfVouaYoBJgIXbU/VFQ1So7 EnrOTJvSYmB1W8IYrKVmEAbVFDsv/WBWinyS62lAudLWX5gU9lj97Xc23qHDv7mnpvfX/0+kgvE dxMbEqBbxd7U2edAABzcy+8FqHRilFRFnH7xN6Z7w2e14Xw33pLw6+v5hSlZPMBtRC96QP2OwTg D1sLT2IQfp2scNzBbspCl5zYrIFeF95N+r8trXLYTticsXaDqdCLGiyAgwk6959foBmAaoEiWa1 U3r0xtF27SHXapYza3MHSnk08lXSuzIX4fRS35BOVFmGOdrVbi0fY7Fk9D9jT/wnp+TiH2tTr/E MIdQufB0VsYHnT3Jy7VG/eX9nUKLhJtTtDoEaeiAKaGF7HLb6oVw6bopsSveUl6CnGcnQSwlavY MyGK5FL/rdneotQrcvxa/p6LwwFLghpHy60P+v6g3l7hbFEirJO+D4GIHP8Bk6tdi+I9M= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: E3252140007 X-Rspam-User: X-Stat-Signature: tbk1gsbsjjs7y4cfu6rh4cuo96jmeaza X-HE-Tag: 1789371064-40884 X-HE-Meta: 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 +TXtnG/W lCDHzUgG+6fuKVsOFX/eupSFEQdMrbwgW/k4wkR4ncwnPR2k6SfZrz8XQSrGnpc7xmqrU2jhMNdf498G9P499LZQPdjHzsfuAVGkmZFiaUSs/YaoAqPsJNdmXjblT8bJnSMHmQTMIVxW1TONE3qEcfySPLjvd2RbMQhJ4+yz3XosBQzJaJWCnvvyxN6NCUG5weBgNB851sXhCi65ZnkHwQ7KEFC2xizEnzOkCau7yfLln1T+j+j7DaN76vTr2RQCYT6mRRmCtRkICRbEatjp1x2C3Ywy4eeZCIy2mAI0qoF8eATpBxQ7k0CQuAT7JXh/MY2ulBC2LJvaXbTg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: HPAGE_SIZE and HPAGE_SHIFT macro is written based on the 4KB PAGE_SIZE. When this macro is used in some test, test result would be strange in the system where PAGE_SIZE is more then 4KB. Here is the example with transhuge-stress test with 16KB PAGE_SIZE: transhuge-stress: allocate 61073 transhuge pages, using 122146 MiB virtual memory and 1908 MiB of ram 3.292 s/loop, 0.054 ms/page, 37106.002 MiB/s 2566 succeed, 58507 failed, 2566 different pages 0.591 s/loop, 0.010 ms/page, 206850.792 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231895.107 MiB/s 0 succeed, 61073 failed, 0 different pages 3.292 s/loop, 0.054 ms/page, 37106.002 MiB/s 2566 succeed, 58507 failed, 2566 different pages 0.591 s/loop, 0.010 ms/page, 206850.792 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231895.107 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231839.704 MiB/s 0 succeed, 61073 failed, 0 different pages 0.528 s/loop, 0.009 ms/page, 231544.782 MiB/s 0 succeed, 61073 failed, 0 different pages 0.528 s/loop, 0.009 ms/page, 231462.074 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231770.300 MiB/s 0 succeed, 61073 failed, 0 different pages ... ok 1 Completed To address this, remove the HPAGE_SIZE and HPAGE_SHIFT macro, introduce pmd_pshift() and rename read_pmd_pagesize() to pmd_psize() to keep consistency with psize() and pshift(). Also, run the KSM_MERGE_TIME_HUGE_PAGES test with a size of 512 MiB, which is the least common multiple of the PMD sizes for 4 KiB, 16 KiB, and 64 KiB base pages. Since allocate_transhuge() allocates mappings in PMD-sized units, the test may fail with the previous size of 100 MiB, which is not a multiple of the PMD size when the base page size is 16 KiB or 64 KiB. After this patch, output of transhuge-stress: transhuge-stress: allocate 3817 transhuge pages, using 122146 MiB virtual memory and 119 MiB of ram 2.558 s/loop, 0.670 ms/page, 47755.759 MiB/s 2585 succeed, 1232 failed, 2585 different pages 2.640 s/loop, 0.692 ms/page, 46268.432 MiB/s 2585 succeed, 1232 failed, 2585 different pages 2.635 s/loop, 0.690 ms/page, 46360.298 MiB/s 2585 succeed, 1232 failed, 2585 different pages 2.782 s/loop, 0.729 ms/page, 43899.795 MiB/s 2616 succeed, 1201 failed, 2616 different pages 2.692 s/loop, 0.705 ms/page, 45380.876 MiB/s 2627 succeed, 1190 failed, 2627 different pages 2.612 s/loop, 0.684 ms/page, 46765.812 MiB/s 2628 succeed, 1189 failed, 2628 different pages 2.683 s/loop, 0.703 ms/page, 45520.990 MiB/s 2630 succeed, 1187 failed, 2630 different pages 2.727 s/loop, 0.714 ms/page, 44789.321 MiB/s 2631 succeed, 1186 failed, 2631 different pages ... ok 1 Completed Additionally, introduce size_to_shift() for future users that need to obtain shift of a huge-page which is other than pmd_psize(). Patch History ============= Change in v3: - rename read_pmd_pagesize() to pmd_psize() - introduce size_to_shift() - Link to v2: https://lore.kernel.org/all/20260907081509.924979-1-yeoreum.yun@arm.com/ Chnage in v2: - rename hpage_* to pmd_page_* - Link to v1: https://lore.kernel.org/all/20260902175611.1241118-1-yeoreum.yun@arm.com/#t --- Yeoreum Yun (3): kselftest: mm: rename read_pmd_pagesize() to pmd_psize() kselftest: mm: remove HPAGE_SIZE and HPAGE_SHIFT macro kselftest: mm: introduce size_to_shift() helper tools/testing/selftests/mm/cow.c | 2 +- tools/testing/selftests/mm/folio_split_race_test.c | 2 +- tools/testing/selftests/mm/guard-regions.c | 11 ++++- tools/testing/selftests/mm/hmm-tests.c | 22 ++++----- tools/testing/selftests/mm/khugepaged.c | 2 +- tools/testing/selftests/mm/ksm_tests.c | 16 ++++--- tools/testing/selftests/mm/migration.c | 4 +- tools/testing/selftests/mm/mkdirty.c | 2 +- tools/testing/selftests/mm/pagemap_ioctl.c | 2 +- tools/testing/selftests/mm/prctl_thp_disable.c | 4 +- tools/testing/selftests/mm/process_madv.c | 2 +- tools/testing/selftests/mm/run_vmtests.sh | 4 +- tools/testing/selftests/mm/soft-dirty.c | 2 +- tools/testing/selftests/mm/split_huge_page_test.c | 2 +- tools/testing/selftests/mm/transhuge-stress.c | 25 ++++++----- tools/testing/selftests/mm/uffd-common.c | 6 +-- tools/testing/selftests/mm/uffd-unit-tests.c | 8 ++-- tools/testing/selftests/mm/uffd-wp-mremap.c | 2 +- tools/testing/selftests/mm/vm_util.c | 52 ++++++++++++++++++---- tools/testing/selftests/mm/vm_util.h | 12 +++-- 20 files changed, 116 insertions(+), 66 deletions(-) --- base-commit: 6b41451631cabf9ea3b384c2a099088e1598f963 change-id: 20260909-fix_hpage_macro-da069ae04502 Best regards, -- Sincerely, Yeoreum Yun