From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5728AC0032E for ; Wed, 25 Oct 2023 23:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235029AbjJYXup (ORCPT ); Wed, 25 Oct 2023 19:50:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229863AbjJYXtc (ORCPT ); Wed, 25 Oct 2023 19:49:32 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8837C10F1 for ; Wed, 25 Oct 2023 16:49:07 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 570BAC433C8; Wed, 25 Oct 2023 23:49:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1698277747; bh=bG/rbBllF28bUR7TCmdyooku5nVrPOjlD0vtvRXAiiI=; h=Date:To:From:Subject:From; b=DMvHY75H5tPhC3tAdjsnTCMkD5ChYsD/g83eAnqLQDZtg2VBWFIENmS+Ic6TP5TJn TrI08rtr3TyAQXqd/6lmLGlAoDwN5VUY/k3CRdNUv8/V3B+63yX2UsLJ6orcEfp3H1 Y3LGOkMlLRWGbdBJ+hUuFijJ31KIi6ONP5A61DkQ= Date: Wed, 25 Oct 2023 16:49:06 -0700 To: mm-commits@vger.kernel.org, willy@infradead.org, wangkefeng.wang@huawei.com, shy828301@gmail.com, riel@surriel.com, vishal.moola@gmail.com, akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-khugepaged-convert-collapse_pte_mapped_thp-to-use-folios.patch removed from -mm tree Message-Id: <20231025234907.570BAC433C8@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The quilt patch titled Subject: mm/khugepaged: convert collapse_pte_mapped_thp() to use folios has been removed from the -mm tree. Its filename was mm-khugepaged-convert-collapse_pte_mapped_thp-to-use-folios.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: "Vishal Moola (Oracle)" Subject: mm/khugepaged: convert collapse_pte_mapped_thp() to use folios Date: Fri, 20 Oct 2023 11:33:31 -0700 This removes 2 calls to compound_head() and helps convert khugepaged to use folios throughout. Previously, if the address passed to collapse_pte_mapped_thp() corresponded to a tail page, the scan would fail immediately. Using filemap_lock_folio() we get the corresponding folio back and try to operate on the folio instead. Link: https://lkml.kernel.org/r/20231020183331.10770-6-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Rik van Riel Reviewed-by: Yang Shi Cc: Kefeng Wang Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- mm/khugepaged.c | 45 ++++++++++++++++++++------------------------- 1 file changed, 20 insertions(+), 25 deletions(-) --- a/mm/khugepaged.c~mm-khugepaged-convert-collapse_pte_mapped_thp-to-use-folios +++ a/mm/khugepaged.c @@ -1477,7 +1477,7 @@ int collapse_pte_mapped_thp(struct mm_st bool notified = false; unsigned long haddr = addr & HPAGE_PMD_MASK; struct vm_area_struct *vma = vma_lookup(mm, haddr); - struct page *hpage; + struct folio *folio; pte_t *start_pte, *pte; pmd_t *pmd, pgt_pmd; spinlock_t *pml = NULL, *ptl; @@ -1510,19 +1510,14 @@ int collapse_pte_mapped_thp(struct mm_st if (userfaultfd_wp(vma)) return SCAN_PTE_UFFD_WP; - hpage = find_lock_page(vma->vm_file->f_mapping, + folio = filemap_lock_folio(vma->vm_file->f_mapping, linear_page_index(vma, haddr)); - if (!hpage) + if (IS_ERR(folio)) return SCAN_PAGE_NULL; - if (!PageHead(hpage)) { - result = SCAN_FAIL; - goto drop_hpage; - } - - if (compound_order(hpage) != HPAGE_PMD_ORDER) { + if (folio_order(folio) != HPAGE_PMD_ORDER) { result = SCAN_PAGE_COMPOUND; - goto drop_hpage; + goto drop_folio; } result = find_pmd_or_thp_or_none(mm, haddr, &pmd); @@ -1536,13 +1531,13 @@ int collapse_pte_mapped_thp(struct mm_st */ goto maybe_install_pmd; default: - goto drop_hpage; + goto drop_folio; } result = SCAN_FAIL; start_pte = pte_offset_map_lock(mm, pmd, haddr, &ptl); if (!start_pte) /* mmap_lock + page lock should prevent this */ - goto drop_hpage; + goto drop_folio; /* step 1: check all mapped PTEs are to the right huge page */ for (i = 0, addr = haddr, pte = start_pte; @@ -1567,7 +1562,7 @@ int collapse_pte_mapped_thp(struct mm_st * Note that uprobe, debugger, or MAP_PRIVATE may change the * page table, but the new page will not be a subpage of hpage. */ - if (hpage + i != page) + if (folio_page(folio, i) != page) goto abort; } @@ -1582,7 +1577,7 @@ int collapse_pte_mapped_thp(struct mm_st * page_table_lock) ptl nests inside pml. The less time we hold pml, * the better; but userfaultfd's mfill_atomic_pte() on a private VMA * inserts a valid as-if-COWed PTE without even looking up page cache. - * So page lock of hpage does not protect from it, so we must not drop + * So page lock of folio does not protect from it, so we must not drop * ptl before pgt_pmd is removed, so uffd private needs pml taken now. */ if (userfaultfd_armed(vma) && !(vma->vm_flags & VM_SHARED)) @@ -1606,7 +1601,7 @@ int collapse_pte_mapped_thp(struct mm_st continue; /* * We dropped ptl after the first scan, to do the mmu_notifier: - * page lock stops more PTEs of the hpage being faulted in, but + * page lock stops more PTEs of the folio being faulted in, but * does not stop write faults COWing anon copies from existing * PTEs; and does not stop those being swapped out or migrated. */ @@ -1615,7 +1610,7 @@ int collapse_pte_mapped_thp(struct mm_st goto abort; } page = vm_normal_page(vma, addr, ptent); - if (hpage + i != page) + if (folio_page(folio, i) != page) goto abort; /* @@ -1634,8 +1629,8 @@ int collapse_pte_mapped_thp(struct mm_st /* step 3: set proper refcount and mm_counters. */ if (nr_ptes) { - page_ref_sub(hpage, nr_ptes); - add_mm_counter(mm, mm_counter_file(hpage), -nr_ptes); + folio_ref_sub(folio, nr_ptes); + add_mm_counter(mm, mm_counter_file(&folio->page), -nr_ptes); } /* step 4: remove empty page table */ @@ -1659,14 +1654,14 @@ int collapse_pte_mapped_thp(struct mm_st maybe_install_pmd: /* step 5: install pmd entry */ result = install_pmd - ? set_huge_pmd(vma, haddr, pmd, hpage) + ? set_huge_pmd(vma, haddr, pmd, &folio->page) : SCAN_SUCCEED; - goto drop_hpage; + goto drop_folio; abort: if (nr_ptes) { flush_tlb_mm(mm); - page_ref_sub(hpage, nr_ptes); - add_mm_counter(mm, mm_counter_file(hpage), -nr_ptes); + folio_ref_sub(folio, nr_ptes); + add_mm_counter(mm, mm_counter_file(&folio->page), -nr_ptes); } if (start_pte) pte_unmap_unlock(start_pte, ptl); @@ -1674,9 +1669,9 @@ abort: spin_unlock(pml); if (notified) mmu_notifier_invalidate_range_end(&range); -drop_hpage: - unlock_page(hpage); - put_page(hpage); +drop_folio: + folio_unlock(folio); + folio_put(folio); return result; } _ Patches currently in -mm which might be from vishal.moola@gmail.com are