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Fri, 27 Feb 2026 17:44:50 +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 v2 0/6] support batched checking of the young flag for MGLRU Date: Fri, 27 Feb 2026 17:44:34 +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-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D9D0D40008 X-Stat-Signature: n5snge8t4u9hjoor9zup1m1b7i7oh3q9 X-HE-Tag: 1772185494-699056 X-HE-Meta: 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 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 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 | 38 ++++++++++++++++++++++ mm/internal.h | 52 ++++++++++++++++++++++++++++++ mm/rmap.c | 29 ++++++++--------- mm/vmscan.c | 46 ++++++++++++++++++++------- 7 files changed, 154 insertions(+), 88 deletions(-) -- 2.47.3