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Fri, 06 Mar 2026 14:43:57 +0800 From: Baolin Wang To: akpm@linux-foundation.org, david@kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, riel@surriel.com, harry.yoo@oracle.com, jannh@google.com, willy@infradead.org, baohua@kernel.org, dev.jain@arm.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, hannes@cmpxchg.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/6] support batched checking of the young flag for MGLRU Date: Fri, 6 Mar 2026 14:43:36 +0800 Message-ID: X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5372FC0003 X-Stat-Signature: w1zfpo9qntfrtj9gqokpm8btycya57jc X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1772779449-162859 X-HE-Meta: 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 UZL43hMO E8N1zfidyY+o42Iyf4GyNlMWaAKnnFxG7bqEjUeILi8u1h3bJ1fc0iGrpoipm0/VzDPS9Gn0Mwo3XBK1g4Qb7fkqBg4/UHsn74PuJLY+9nEJXvzmhF4Inp9Nsxr0hSmbYW0dXRXAlSTrm9N6jkbRfqn40mfdXDfhaQxMcVaMpg2LRRhtIMwWjet7oTktns2lTZ1BHkjD2XJ6tq0ROPg8S11Qjp7u1aO99L5qo4L8mb4jkEOFJamQjiPgAwnb3CjDDbKZxG18Slz+FlO6ZjQ7/ldoHjWLhs7Wby5v/ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is a follow-up to the previous work [1], to support batched checking of the young flag for MGLRU. Similarly, batched checking of young flag for large folios can improve performance during large-folio reclamation when MGLRU is enabled. I observed noticeable performance improvements (see patch 5) on an Arm64 machine that supports contiguous PTEs. All mm-selftests are passed. Patch 1 - 3: cleanup patches. Patch 4: add a new generic batched PTE helper: test_and_clear_young_ptes(). Patch 5: support batched young flag checking for MGLRU. Patch 6: implement the Arm64 arch-specific test_and_clear_young_ptes(). [1] https://lore.kernel.org/all/cover.1770645603.git.baolin.wang@linux.alibaba.com/ Changes from v2: v2: https://lore.kernel.org/all/cover.1772185080.git.baolin.wang@linux.alibaba.com/ - Update the commit message of patch 5 (per David). - Fix some coding style issues (per David). - Remove 'cur_pte' variable in lru_gen_look_around() (per David). - Move 'ptes += nr;' to the suitable place in folio_referenced_one() (per David). - Add acked tag from David. Thanks. Changes from v1: v1: https://lore.kernel.org/all/cover.1771897150.git.baolin.wang@linux.alibaba.com/ - Update some commit message (per David). - Fix some coding style issues (per David). - Use VM_WARN_ON_ONCE_FOLIO() instead of VM_WARN_ON_FOLIO() (per Rik). - Define a generic ptep_test_and_clear_young_notify() (per David). - Remove redundant 'nr > 1' check in folio_referenced_one() (per David). - Rename some variables' to make code more clear (per David). - Add a new patch to rename some functions (per David). - Update the young counters with the batched count for MGLRU. - Collect reviewed tags from Rik, Barry, Alistair and David. Thanks. Baolin Wang (6): mm: use inline helper functions instead of ugly macros mm: rename ptep/pmdp_clear_young_notify() to ptep/pmdp_test_and_clear_young_notify() mm: rmap: add a ZONE_DEVICE folio warning in folio_referenced() mm: add a batched helper to clear the young flag for large folios mm: support batched checking of the young flag for MGLRU arm64: mm: implement the architecture-specific test_and_clear_young_ptes() arch/arm64/include/asm/pgtable.h | 18 +++++++---- include/linux/mmu_notifier.h | 54 -------------------------------- include/linux/mmzone.h | 5 +-- include/linux/pgtable.h | 37 ++++++++++++++++++++++ mm/internal.h | 52 ++++++++++++++++++++++++++++++ mm/rmap.c | 29 ++++++++--------- mm/vmscan.c | 45 +++++++++++++++++++------- 7 files changed, 152 insertions(+), 88 deletions(-) -- 2.47.3