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Wed, 11 Nov 2026 11:39:11 +0000 X-Mizu-Trace-ID: 48df2cab8c88d833 X-Migadu-Flow: FLOW_OUT From: Usama Arif To: Andrew Morton , apopple@nvidia.com, byungchul@sk.com, david@kernel.org, gourry@gourry.net, jannh@google.com, joshua.hahnjy@gmail.com, liam@infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, matthew.brost@intel.com, mhocko@suse.com, pfalcato@suse.de, rppt@kernel.org, surenb@google.com, vbabka@kernel.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, kas@kernel.org, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, kernel-team@meta.com, baolin.wang@linux.alibaba.com, Nico Pache , ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev Cc: Usama Arif Subject: [PATCH 0/3] mm: fixes for THP migration, swap-in and device-private smaps Date: Wed, 11 Nov 2026 03:38:28 -0800 Message-ID: <20261111113904.650722-1-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Stat-Signature: 41xgd65e7kee4e5uc1ynrgje3mqq739c X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Queue-Id: 7F6B44000D X-Rspam-User: X-HE-Tag: 1794397156-285249 X-HE-Meta: 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 rRykHct0 0bDNxJ3Bhjn/yCqtX9ueAugkm6ub1cVVsGSfZ9wXlHtmkkYwSe2lk/98HCihmhxQvp3aZGlR3kGfKTXVbd6ot0kxCagjPqmibXxMACqiA9CX65+q3rj9yuKt8FNH9jEZ9RMHXnuqwDfi+nYGBEeYslHTP2ge9+v4D8w/0SNAomlSGRl34GwozMsfRBQ1zNLFANxrKaBsG/BueALQZgeVAy9k+QDZeBrLOEgv8rF4TnbN4d63Evvt+l4qjsrmHWCFPHhxypFJeMrzTw4anmi2pFD1hCRb6jRiu8gFWF5iL4hvDOQ/bXg++pr3ysWMSQpy0raPIfCu02Rpv8zc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 This series contains three fixes for existing THP migration, PTE swap-in and smaps paths. They were extracted from the work on PMD swap entries for anonymous THPs [1] and can be merged independently. Sending this separately as requested by Andrew (should have sent them separately anyways, my bad). 1. Avoid a folio reference leak when concurrent MADV_DONTNEED clears or splits a migration PMD before the device migration split helper acquires the PMD lock. 2. Prevent PTE swap-in batching from mapping poisoned subpages of a large swap-cache folio. Include the subpage scan helper with this fix so it can be applied on its own. 3. Account device-private PMDs using mapcounts in smaps, matching the PTE path. Shared mappings get proportional PSS, and exclusive mappings are counted as private. [1] PMD-level swap entries for anonymous THPs: https://lore.kernel.org/r/20261002095503.3585565-1-usama.arif@linux.dev/ Usama Arif (3): mm: don't PTE-batch a swap-in over a hardware-poisoned subpage fs/proc/task_mmu: don't read young/dirty from a non-present PMD in smaps fs/proc/task_mmu: account device-private PMDs as present in smaps fs/proc/task_mmu.c | 12 ++++++++---- mm/internal.h | 15 +++++++++++++++ mm/memory.c | 4 ++++ 3 files changed, 27 insertions(+), 4 deletions(-) -- 2.53.0-Meta