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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Muchun Song , Oscar Salvador , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Axel Rasmussen , Yuanchu Xie , Wei Xu , Kemeng Shi , Kairui Song , Nhat Pham , Baoquan He , Chris Li , SeongJae Park , Matthew Wilcox , Jason Gunthorpe , Leon Romanovsky , Xu Xin , Chengming Zhou , Jann Horn , Miaohe Lin , Naoya Horiguchi , Pedro Falcato , Pasha Tatashin , Rik van Riel , Harry Yoo , Hugh Dickins , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, damon@lists.linux.dev Subject: [PATCH v2 06/16] fs/proc/task_mmu: refactor pagemap_pmd_range() Date: Sat, 8 Nov 2025 17:08:20 +0000 Message-ID: <377aceac6e129305f4903ec74178cdfeeb22f2d8.1762621568.git.lorenzo.stoakes@oracle.com> X-Mailer: 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kcEz9JlNB0PjmYUBq7hINNmC-rD41CHZ Content-Type: text/plain; charset="utf-8" Separate out THP logic so we can drop an indentation level and reduce the amount of noise in this function. We add pagemap_pmd_range_thp() for this purpose. While we're here, convert the VM_BUG_ON() to a VM_WARN_ON_ONCE() at the same time. No functional change intended. Signed-off-by: Lorenzo Stoakes --- fs/proc/task_mmu.c | 146 ++++++++++++++++++++++++--------------------- 1 file changed, 77 insertions(+), 69 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index ddbf177ecc45..5ca18bd3b2d0 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1984,90 +1984,98 @@ static pagemap_entry_t pte_to_pagemap_entry(struct = pagemapread *pm, return make_pme(frame, flags); } =20 -static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned lon= g end, - struct mm_walk *walk) +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static int pagemap_pmd_range_thp(pmd_t *pmdp, unsigned long addr, + unsigned long end, struct vm_area_struct *vma, + struct pagemapread *pm) { - struct vm_area_struct *vma =3D walk->vma; - struct pagemapread *pm =3D walk->private; - spinlock_t *ptl; - pte_t *pte, *orig_pte; + unsigned int idx =3D (addr & ~PMD_MASK) >> PAGE_SHIFT; + u64 flags =3D 0, frame =3D 0; + pmd_t pmd =3D *pmdp; + struct page *page =3D NULL; + struct folio *folio =3D NULL; int err =3D 0; -#ifdef CONFIG_TRANSPARENT_HUGEPAGE =20 - ptl =3D pmd_trans_huge_lock(pmdp, vma); - if (ptl) { - unsigned int idx =3D (addr & ~PMD_MASK) >> PAGE_SHIFT; - u64 flags =3D 0, frame =3D 0; - pmd_t pmd =3D *pmdp; - struct page *page =3D NULL; - struct folio *folio =3D NULL; + if (vma->vm_flags & VM_SOFTDIRTY) + flags |=3D PM_SOFT_DIRTY; =20 - if (vma->vm_flags & VM_SOFTDIRTY) - flags |=3D PM_SOFT_DIRTY; + if (pmd_present(pmd)) { + page =3D pmd_page(pmd); =20 - if (pmd_present(pmd)) { - page =3D pmd_page(pmd); + flags |=3D PM_PRESENT; + if (pmd_soft_dirty(pmd)) + flags |=3D PM_SOFT_DIRTY; + if (pmd_uffd_wp(pmd)) + flags |=3D PM_UFFD_WP; + if (pm->show_pfn) + frame =3D pmd_pfn(pmd) + idx; + } else if (thp_migration_supported() && is_swap_pmd(pmd)) { + swp_entry_t entry =3D pmd_to_swp_entry(pmd); + unsigned long offset; =20 - flags |=3D PM_PRESENT; - if (pmd_soft_dirty(pmd)) - flags |=3D PM_SOFT_DIRTY; - if (pmd_uffd_wp(pmd)) - flags |=3D PM_UFFD_WP; - if (pm->show_pfn) - frame =3D pmd_pfn(pmd) + idx; - } -#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION - else if (is_swap_pmd(pmd)) { - swp_entry_t entry =3D pmd_to_swp_entry(pmd); - unsigned long offset; - - if (pm->show_pfn) { - if (is_pfn_swap_entry(entry)) - offset =3D swp_offset_pfn(entry) + idx; - else - offset =3D swp_offset(entry) + idx; - frame =3D swp_type(entry) | - (offset << MAX_SWAPFILES_SHIFT); - } - flags |=3D PM_SWAP; - if (pmd_swp_soft_dirty(pmd)) - flags |=3D PM_SOFT_DIRTY; - if (pmd_swp_uffd_wp(pmd)) - flags |=3D PM_UFFD_WP; - VM_BUG_ON(!is_pmd_migration_entry(pmd)); - page =3D pfn_swap_entry_to_page(entry); + if (pm->show_pfn) { + if (is_pfn_swap_entry(entry)) + offset =3D swp_offset_pfn(entry) + idx; + else + offset =3D swp_offset(entry) + idx; + frame =3D swp_type(entry) | + (offset << MAX_SWAPFILES_SHIFT); } -#endif + flags |=3D PM_SWAP; + if (pmd_swp_soft_dirty(pmd)) + flags |=3D PM_SOFT_DIRTY; + if (pmd_swp_uffd_wp(pmd)) + flags |=3D PM_UFFD_WP; + VM_WARN_ON_ONCE(!is_pmd_migration_entry(pmd)); + page =3D pfn_swap_entry_to_page(entry); + } =20 - if (page) { - folio =3D page_folio(page); - if (!folio_test_anon(folio)) - flags |=3D PM_FILE; - } + if (page) { + folio =3D page_folio(page); + if (!folio_test_anon(folio)) + flags |=3D PM_FILE; + } =20 - for (; addr !=3D end; addr +=3D PAGE_SIZE, idx++) { - u64 cur_flags =3D flags; - pagemap_entry_t pme; + for (; addr !=3D end; addr +=3D PAGE_SIZE, idx++) { + u64 cur_flags =3D flags; + pagemap_entry_t pme; =20 - if (folio && (flags & PM_PRESENT) && - __folio_page_mapped_exclusively(folio, page)) - cur_flags |=3D PM_MMAP_EXCLUSIVE; + if (folio && (flags & PM_PRESENT) && + __folio_page_mapped_exclusively(folio, page)) + cur_flags |=3D PM_MMAP_EXCLUSIVE; =20 - pme =3D make_pme(frame, cur_flags); - err =3D add_to_pagemap(&pme, pm); - if (err) - break; - if (pm->show_pfn) { - if (flags & PM_PRESENT) - frame++; - else if (flags & PM_SWAP) - frame +=3D (1 << MAX_SWAPFILES_SHIFT); - } + pme =3D make_pme(frame, cur_flags); + err =3D add_to_pagemap(&pme, pm); + if (err) + break; + if (pm->show_pfn) { + if (flags & PM_PRESENT) + frame++; + else if (flags & PM_SWAP) + frame +=3D (1 << MAX_SWAPFILES_SHIFT); } + } + return err; +} +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + +static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned lon= g end, + struct mm_walk *walk) +{ + struct vm_area_struct *vma =3D walk->vma; + struct pagemapread *pm =3D walk->private; + spinlock_t *ptl; + pte_t *pte, *orig_pte; + int err =3D 0; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + ptl =3D pmd_trans_huge_lock(pmdp, vma); + if (ptl) { + err =3D pagemap_pmd_range_thp(pmdp, addr, end, vma, pm); spin_unlock(ptl); return err; } -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#endif =20 /* * We can assume that @vma always points to a valid one and @end never --=20 2.51.0