From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AD5C74C8A for ; Thu, 21 Mar 2024 23:02:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711062149; cv=none; b=n8BfExFbTuKGqYHKCDFWdbI6gmOss6fG1aMxiOvHRvEud60GUa+Jp2Zf7hpQFK0gDusjXyXItla59sZ2I9RslyYz8pVayO6DtucMahKc8IzgepohbzF2BdbUP9rF6rg8CPZVRfwJwndTtDvSeQcQNmpuOoBzMt/XvcIRUbz0FR0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711062149; c=relaxed/simple; bh=M6eEmYq/SBMFG+e1Xccw2ZnkQWI9UoGZHE0qKFJwv1M=; h=Date:To:From:Subject:Message-Id; b=fx7ozVtpu2IH46cAWZK6d9dGF+z2G4eleKUBMpTPT9yT7BMVreQN7AkEC0r0FaEG22o7gDdfPk/Cvr5SWQUt8SEALGJMyJ8mfSS8uW4FK8s+lOD1NLzECJJdrwuqLHIQ3JRebfPueNR0bgh+tHWz+zrx9ZQC9HAaILvOSgH2s2c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=wcmRNibF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="wcmRNibF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3508DC433C7; Thu, 21 Mar 2024 23:02:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1711062149; bh=M6eEmYq/SBMFG+e1Xccw2ZnkQWI9UoGZHE0qKFJwv1M=; h=Date:To:From:Subject:From; b=wcmRNibFr9xG6SR9o5pPh9YPo4Fm6wcaToJ1BV5kEJqCYCq1pnvWg3PUxcRnCU5nM OJ3WUwC2GfNjwFYZhnzygckzrBrR4QQJgp8fS1gfDIwfil5F/jbExX1iflrMCe/qHw Dj/qzg7w+9CUk4n66gKuWoDRzT7IVQ1iQUSwfIUw= Date: Thu, 21 Mar 2024 16:02:28 -0700 To: mm-commits@vger.kernel.org,willy@infradead.org,vbabka@suse.cz,shy828301@gmail.com,rppt@kernel.org,riel@surriel.com,muchun.song@linux.dev,mpe@ellerman.id.au,mike.kravetz@oracle.com,lstoakes@gmail.com,kirill@shutemov.name,jthoughton@google.com,jhubbard@nvidia.com,jgg@nvidia.com,hch@infradead.org,david@redhat.com,christophe.leroy@csgroup.eu,axelrasmussen@google.com,aneesh.kumar@kernel.org,andrew.jones@linux.dev,aarcange@redhat.com,peterx@redhat.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-introduce-vma_pgtable_walk_beginend.patch added to mm-unstable branch Message-Id: <20240321230229.3508DC433C7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: introduce vma_pgtable_walk_{begin|end}() has been added to the -mm mm-unstable branch. Its filename is mm-introduce-vma_pgtable_walk_beginend.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-introduce-vma_pgtable_walk_beginend.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Peter Xu Subject: mm: introduce vma_pgtable_walk_{begin|end}() Date: Thu, 21 Mar 2024 18:07:54 -0400 Introduce per-vma begin()/end() helpers for pgtable walks. This is a preparation work to merge hugetlb pgtable walkers with generic mm. The helpers need to be called before and after a pgtable walk, will start to be needed if the pgtable walker code supports hugetlb pages. It's a hook point for any type of VMA, but for now only hugetlb uses it to stablize the pgtable pages from getting away (due to possible pmd unsharing). Link: https://lkml.kernel.org/r/20240321220802.679544-5-peterx@redhat.com Signed-off-by: Peter Xu Reviewed-by: Christoph Hellwig Reviewed-by: Muchun Song Cc: Andrea Arcangeli Cc: Andrew Jones Cc: "Aneesh Kumar K.V" Cc: Axel Rasmussen Cc: Christophe Leroy Cc: David Hildenbrand Cc: James Houghton Cc: Jason Gunthorpe Cc: John Hubbard Cc: Kirill A. Shutemov Cc: Lorenzo Stoakes Cc: Matthew Wilcox (Oracle) Cc: Michael Ellerman Cc: Mike Kravetz Cc: Mike Rapoport (IBM) Cc: Rik van Riel Cc: Vlastimil Babka Cc: Yang Shi Signed-off-by: Andrew Morton --- include/linux/mm.h | 3 +++ mm/memory.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) --- a/include/linux/mm.h~mm-introduce-vma_pgtable_walk_beginend +++ a/include/linux/mm.h @@ -4209,4 +4209,7 @@ static inline bool pfn_is_unaccepted_mem return range_contains_unaccepted_memory(paddr, paddr + PAGE_SIZE); } +void vma_pgtable_walk_begin(struct vm_area_struct *vma); +void vma_pgtable_walk_end(struct vm_area_struct *vma); + #endif /* _LINUX_MM_H */ --- a/mm/memory.c~mm-introduce-vma_pgtable_walk_beginend +++ a/mm/memory.c @@ -6438,3 +6438,15 @@ void ptlock_free(struct ptdesc *ptdesc) kmem_cache_free(page_ptl_cachep, ptdesc->ptl); } #endif + +void vma_pgtable_walk_begin(struct vm_area_struct *vma) +{ + if (is_vm_hugetlb_page(vma)) + hugetlb_vma_lock_read(vma); +} + +void vma_pgtable_walk_end(struct vm_area_struct *vma) +{ + if (is_vm_hugetlb_page(vma)) + hugetlb_vma_unlock_read(vma); +} _ Patches currently in -mm which might be from peterx@redhat.com are mm-memory-fix-missing-pte-marker-for-page-on-pte-zaps.patch mm-hmm-process-pud-swap-entry-without-pud_huge.patch mm-gup-cache-p4d-in-follow_p4d_mask.patch mm-gup-check-p4d-presence-before-going-on.patch mm-x86-change-pxd_huge-behavior-to-exclude-swap-entries.patch mm-sparc-change-pxd_huge-behavior-to-exclude-swap-entries.patch mm-arm-use-macros-to-define-pmd-pud-helpers.patch mm-arm-redefine-pmd_huge-with-pmd_leaf.patch mm-arm64-merge-pxd_huge-and-pxd_leaf-definitions.patch mm-powerpc-redefine-pxd_huge-with-pxd_leaf.patch mm-gup-merge-pxd-huge-mapping-checks.patch mm-treewide-replace-pxd_huge-with-pxd_leaf.patch mm-treewide-remove-pxd_huge.patch mm-arm-remove-pmd_thp_or_huge.patch mm-document-pxd_leaf-api.patch mm-kconfig-config_pgtable_has_huge_leaves.patch mm-hugetlb-declare-hugetlbfs_pagecache_present-non-static.patch mm-make-hpage_pxd_-macros-even-if-thp.patch mm-introduce-vma_pgtable_walk_beginend.patch mm-gup-drop-folio_fast_pin_allowed-in-hugepd-processing.patch mm-gup-refactor-record_subpages-to-find-1st-small-page.patch mm-gup-handle-hugetlb-for-no_page_table.patch mm-gup-cache-pudp-in-follow_pud_mask.patch mm-gup-handle-huge-pud-for-follow_pud_mask.patch mm-gup-handle-huge-pmd-for-follow_pmd_mask.patch mm-gup-handle-hugepd-for-follow_page.patch mm-gup-handle-hugetlb-in-the-generic-follow_page_mask-code.patch