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Wed, 11 Mar 2026 17:15:33 -0400 X-MC-Unique: PO0vbtmoMt6CjKGN50MpqA-1 X-Mimecast-MFC-AGG-ID: PO0vbtmoMt6CjKGN50MpqA_1773263727 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id CD3311956096; Wed, 11 Mar 2026 21:15:23 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.89.69]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B9DE230002D2; Wed, 11 Mar 2026 21:15:08 +0000 (UTC) From: Nico Pache To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: aarcange@redhat.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, catalin.marinas@arm.com, cl@gentwo.org, corbet@lwn.net, dave.hansen@linux.intel.com, david@kernel.org, dev.jain@arm.com, gourry@gourry.net, hannes@cmpxchg.org, hughd@google.com, jackmanb@google.com, jack@suse.cz, jannh@google.com, jglisse@google.com, joshua.hahnjy@gmail.com, kas@kernel.org, lance.yang@linux.dev, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, mathieu.desnoyers@efficios.com, matthew.brost@intel.com, mhiramat@kernel.org, mhocko@suse.com, npache@redhat.com, peterx@redhat.com, pfalcato@suse.de, rakie.kim@sk.com, raquini@redhat.com, rdunlap@infradead.org, richard.weiyang@gmail.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, ryan.roberts@arm.com, shivankg@amd.com, sunnanyong@huawei.com, surenb@google.com, thomas.hellstrom@linux.intel.com, tiwai@suse.de, usamaarif642@gmail.com, vbabka@suse.cz, vishal.moola@gmail.com, wangkefeng.wang@huawei.com, will@kernel.org, willy@infradead.org, yang@os.amperecomputing.com, ying.huang@linux.alibaba.com, ziy@nvidia.com, zokeefe@google.com Subject: [PATCH mm-unstable v3 0/5] mm: khugepaged cleanups and mTHP prerequisites Date: Wed, 11 Mar 2026 15:13:10 -0600 Message-ID: <20260311211315.450947-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: mJX-Etu-L8HQiZbOV5XtMcjoY32UDR6crNsyWpuyQ70_1773263727 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspam-User: X-Rspamd-Queue-Id: 3E46940015 X-Rspamd-Server: rspam08 X-Stat-Signature: xm9p1ekiw3sc37n5i1dy3s7pudyfzfcj X-HE-Tag: 1773263737-532834 X-HE-Meta: U2FsdGVkX1+LzOSU7Hv9yd6+IpYuw4Sq9/dY7K1NLw5Vg1iYg+clghSmxO7ThQUgMZ9gjhL6AYOLM+qwFz3FCyCS/+NNw4V0cRPaa2PnDhZhy5GjqZVKjG76cQH3J1gSXmR/m75jfNZlxl8D08DoFPIn+iJQNj9U2S4794kyB7W8SseredkyiNhKOHBhzyOmTU46fwTpIU2p5+V2aIc8hezGYaFUKbrgg8NgazpWqvLadmie5m/KGJArhiELatpE6GRDDuLs1d0Ukl6Ft7Kt9pNLUN4izmKoU1+rf19+kllf812l65Jsaa1yRocqBlawNvLRHr+OYtIn5OzSdhcVKrz+rMgxpuaR+LVcRWsIc13Ic4lhNmvXYuAUCi8L7A2eMoTHDhAHQu0ZoDYCl/BgAm5YRcYQlpp4VGR3LFBnkV9qbv8kOh5RYFonEgE7Du+phlZT9f/XPAg/7nFaYvNPmSWApyAQLjqjMzUzXkYrlrqvFZoKDQ+LXbNPBs4luPeXiLcj0g3UxL+I++0sT7CuY9d7tz1vthIedA9VZkmhZ4gHI3lakxpgsKvxHC2w+vdoJ83i8o9osqPMleMTztoYEOXdTQNxSHmBqw/xIXLyg51CPaKB4iDc9xoQHs+wpzGCZwNBu5wu0xVFy70503wrDMlQeOWFQDaBAT9zeAAbxkRf527MX4cI3uXCAbFSgK7QR2qBeW8vo8LfiU/Yfm6s3/k3YlVj9fsXNxjC7XUtTjb461lC4WVYUYKqa3Qh23dbPZGVfe9m38v+rRXWfi6Tq9ulhQtH5kw+sfiA5HnRl/alXkLXff6ZgbRcaMgWnUVDq73BqQNZeyr3Zz+BsCSXEdoOPhnA008yY9fM+NlUXAve15z96+0GvqKkSl1DEl2Fxu4QAdqmt00gn/nrif/AomOocgu8O9Ih4H+iuwGMnS3IzYE5/Po1acIkm8yqyBwqg8pNkAdyg79q5fAr2W0 ceDJwgto 6BLiSbc6MEY5XuulJayzsXulcZl3lp1wSe1FGoFRIhlSwqb4xMbSpiC+/xooz//zuxSV2sc5nK79d/SBIYvCDMcmKWakFTTam5GE1cxXuOFMBcTw2+jtg7nSFs5BldAVFCvxKegm0T/0THeafAqi/yW93cGaZpU2l5L4tH45eu7KR1K0YRrpnFMTvHD/pRqxbse6JKFHeCWeo5dPYKouClQ0T86Va7TToE59jl9kZggNv+fYK0o7SdPtiInGj05AKiHkyEv087hDIQQkx/g3TLk7ZN4w7k1KtErN/6HZVxE21Q4hW7kPkEWOzodCjYoXqlz4LIW5yVZduI0A60C/wvIJ1dbGrkJGe5B9xtGf3lYrdFgiQZIYnARCy9e6ZfPO4Bu0WHF4aGPg6fBwG6db9Odq7+Ui+oXVfeiQzBwL4z/1GeNpx10IZ91C78A== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The following series contains cleanups and prerequisites for my work on khugepaged mTHP support [1]. These have been separated out to ease review. The first patch in the series refactors the page fault folio to pte mapping and follows a similar convention as defined by map_anon_folio_pmd_(no)pf(). This not only cleans up the current implementation of do_anonymous_page(), but will allow for reuse later in the khugepaged mTHP implementation. The second patch adds a small is_pmd_order() helper to check if an order is the PMD order. This check is open-coded in a number of places. This patch aims to clean this up and will be used more in the khugepaged mTHP work. The third patch also adds a small DEFINE for (HPAGE_PMD_NR - 1) which is used often across the khugepaged code. The fourth and fifth patch come from the khugepaged mTHP patchset [1]. These two patches include the rename of function prefixes, and the unification of khugepaged and madvise_collapse via a new collapse_single_pmd function. Patch 1: refactor do_anonymous_page into map_anon_folio_pte_(no)pf Patch 2: add is_pmd_order helper Patch 3: Add define for (HPAGE_PMD_NR - 1) Patch 4: Refactor/rename hpage_collapse Patch 5: Refactoring to combine madvise_collapse and khugepaged Testing: - Built for x86_64, aarch64, ppc64le, and s390x - ran all arches on test suites provided by the kernel-tests project - selftests mm V3 Changes: - Patch1: leverage folio_order rather than passing nr_pages into map_anon_folio_pte_pf [2] - Patch 2: fixed conflict with is_pmd_order - Patch 3: Change COLLAPSE_MAX_PTES_LIMIT to KHUGEPAGED_MAX_PTES_LIMIT [3] - Patch 4: conflict resolution with other khugepaged patches - Patch 5: Drop lock_dropped unnecessary change, Dropped Lorenzos RB, !triggered_wb in if statement rather than triggered_wb, remove unnecessary mmap_locked flipping [4] V2 - https://lore.kernel.org/all/20260226012929.169479-1-npache@redhat.com/ V1 - https://lore.kernel.org/lkml/20260212021835.17755-1-npache@redhat.com/ A big thanks to everyone that has reviewed, tested, and participated in the development process. [1] - https://lore.kernel.org/all/20260122192841.128719-1-npache@redhat.com/ [2] - https://lore.kernel.org/all/7334b702-f6a0-4ccf-8ac6-8426a90d1846@kernel.org/ [3] - https://lore.kernel.org/all/25723c0f-c702-44ad-93e9-1056313680cd@kernel.org/ [4] - https://lore.kernel.org/all/81ff9caa-50f2-4951-8d82-2c8dcdf3db91@kernel.org/ Nico Pache (5): mm: consolidate anonymous folio PTE mapping into helpers mm: introduce is_pmd_order helper mm/khugepaged: define KHUGEPAGED_MAX_PTES_LIMIT as HPAGE_PMD_NR - 1 mm/khugepaged: rename hpage_collapse_* to collapse_* mm/khugepaged: unify khugepaged and madv_collapse with collapse_single_pmd() include/linux/huge_mm.h | 5 ++ include/linux/mm.h | 4 + mm/huge_memory.c | 2 +- mm/khugepaged.c | 187 +++++++++++++++++++++------------------- mm/memory.c | 62 ++++++++----- mm/mempolicy.c | 2 +- mm/mremap.c | 2 +- mm/page_alloc.c | 4 +- mm/shmem.c | 3 +- 9 files changed, 153 insertions(+), 118 deletions(-) -- 2.53.0