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Wed, 25 Mar 2026 11:40:53 +0000 (UTC) Received: from p1.redhat.com (unknown [10.2.14.4]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id CD3F01800576; Wed, 25 Mar 2026 11:40:30 +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 v4 0/5] mm: khugepaged cleanups and mTHP prerequisites Date: Wed, 25 Mar 2026 05:40:17 -0600 Message-ID: <20260325114022.444081-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: sHqlhBh4R2qwq3z7icWgfxeCb7YLQud0abIbbcDgyTE_1774438855 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 429581C0004 X-Stat-Signature: c83r5bmp5gcocoeo4hbrpk8daneux7qh X-Rspam-User: X-HE-Tag: 1774438865-208693 X-HE-Meta: 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 dyxaxvoT zn4dkendFoKETrNpYlqzoPLRcNiO9LaAb5I/suutayzZMe/2LNLoxYGnEc8c3oskeevPm1jzJHlORK2aoYOPV3enKlsQDa4uGmLEi/LOFNpknhemdrT29pJ7kzedRtFjuYW0hER8NfogSaOYjS1bNAR/4wj0bR+wxFcT1LVAEcQfGOdOWFdnZknQLabWIva+gLoRKXESau4xDtmvNDCM3ZHH6+NNdDVHD6NjuQRPwoa8aftx2mXjCA/wQgbOpEtt1GoYIMub0E+w0zLQ3d8kt21a0ScQYphH/BKYTmNifBIMvW0LUfFd+Tg396k/StIhoh6qfyWxfVsoJLczGGQKAR2xB/s7vzePWiJg75sNmpheyXhuN4u25dqpd6oi5EwfYrn7f+aJ+8kNluw/njA2Ar6GVivD9Fh8/gLlo6N4qtMxwilu3d60oZ3wXrQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: MAINTAINER NOTE: This is based on mm-unstable with the coresponding patches reverted then reapplied. 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 V4 Changes: - added RB and SB tags - Patch1: commit message cleanup/additions - Patch1: constify two variables, and change 1<