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[73.170.51.167]) by smtp.googlemail.com with ESMTPSA id z14-20020aa7990e000000b006b4ac8885b4sm1911345pff.14.2023.10.20.11.33.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 11:33:43 -0700 (PDT) From: "Vishal Moola (Oracle)" To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, "Vishal Moola (Oracle)" , Matthew Wilcox Subject: [PATCH v3 1/5] mm/khugepaged: Convert __collapse_huge_page_isolate() to use folios Date: Fri, 20 Oct 2023 11:33:27 -0700 Message-Id: <20231020183331.10770-2-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231020183331.10770-1-vishal.moola@gmail.com> References: <20231020183331.10770-1-vishal.moola@gmail.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 5E1DFA0016 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: tu6omiutfgaop4rzijrc9rz7cqkcwj3j X-HE-Tag: 1697826825-45399 X-HE-Meta: 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 MQCoQXGJ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Replaces 11 calls to compound_head() with 1, and removes 1348 bytes of kernel text. Reviewed-by: Matthew Wilcox (Oracle) Signed-off-by: Vishal Moola (Oracle) Reviewed-by: David Hildenbrand Reviewed-by: Yang Shi --- mm/khugepaged.c | 45 +++++++++++++++++++++++---------------------- 1 file changed, 23 insertions(+), 22 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 88433cc25d8a..500756604488 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -542,6 +542,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, struct list_head *compound_pagelist) { struct page *page = NULL; + struct folio *folio = NULL; pte_t *_pte; int none_or_zero = 0, shared = 0, result = SCAN_FAIL, referenced = 0; bool writable = false; @@ -576,7 +577,8 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, goto out; } - VM_BUG_ON_PAGE(!PageAnon(page), page); + folio = page_folio(page); + VM_BUG_ON_FOLIO(!folio_test_anon(folio), folio); if (page_mapcount(page) > 1) { ++shared; @@ -588,16 +590,15 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, } } - if (PageCompound(page)) { - struct page *p; - page = compound_head(page); + if (folio_test_large(folio)) { + struct folio *f; /* * Check if we have dealt with the compound page * already */ - list_for_each_entry(p, compound_pagelist, lru) { - if (page == p) + list_for_each_entry(f, compound_pagelist, lru) { + if (folio == f) goto next; } } @@ -608,7 +609,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, * is needed to serialize against split_huge_page * when invoked from the VM. */ - if (!trylock_page(page)) { + if (!folio_trylock(folio)) { result = SCAN_PAGE_LOCK; goto out; } @@ -624,8 +625,8 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, * but not from this process. The other process cannot write to * the page, only trigger CoW. */ - if (!is_refcount_suitable(page)) { - unlock_page(page); + if (!is_refcount_suitable(&folio->page)) { + folio_unlock(folio); result = SCAN_PAGE_COUNT; goto out; } @@ -634,27 +635,27 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, * Isolate the page to avoid collapsing an hugepage * currently in use by the VM. */ - if (!isolate_lru_page(page)) { - unlock_page(page); + if (!folio_isolate_lru(folio)) { + folio_unlock(folio); result = SCAN_DEL_PAGE_LRU; goto out; } - mod_node_page_state(page_pgdat(page), - NR_ISOLATED_ANON + page_is_file_lru(page), - compound_nr(page)); - VM_BUG_ON_PAGE(!PageLocked(page), page); - VM_BUG_ON_PAGE(PageLRU(page), page); + node_stat_mod_folio(folio, + NR_ISOLATED_ANON + folio_is_file_lru(folio), + folio_nr_pages(folio)); + VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio); + VM_BUG_ON_FOLIO(folio_test_lru(folio), folio); - if (PageCompound(page)) - list_add_tail(&page->lru, compound_pagelist); + if (folio_test_large(folio)) + list_add_tail(&folio->lru, compound_pagelist); next: /* * If collapse was initiated by khugepaged, check that there is * enough young pte to justify collapsing the page */ if (cc->is_khugepaged && - (pte_young(pteval) || page_is_young(page) || - PageReferenced(page) || mmu_notifier_test_young(vma->vm_mm, + (pte_young(pteval) || folio_test_young(folio) || + folio_test_referenced(folio) || mmu_notifier_test_young(vma->vm_mm, address))) referenced++; @@ -668,13 +669,13 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, result = SCAN_LACK_REFERENCED_PAGE; } else { result = SCAN_SUCCEED; - trace_mm_collapse_huge_page_isolate(page, none_or_zero, + trace_mm_collapse_huge_page_isolate(&folio->page, none_or_zero, referenced, writable, result); return result; } out: release_pte_pages(pte, _pte, compound_pagelist); - trace_mm_collapse_huge_page_isolate(page, none_or_zero, + trace_mm_collapse_huge_page_isolate(&folio->page, none_or_zero, referenced, writable, result); 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[73.170.51.167]) by smtp.googlemail.com with ESMTPSA id z14-20020aa7990e000000b006b4ac8885b4sm1911345pff.14.2023.10.20.11.33.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 11:33:44 -0700 (PDT) From: "Vishal Moola (Oracle)" To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, "Vishal Moola (Oracle)" Subject: [PATCH v3 2/5] mm/khugepaged: Convert hpage_collapse_scan_pmd() to use folios Date: Fri, 20 Oct 2023 11:33:28 -0700 Message-Id: <20231020183331.10770-3-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231020183331.10770-1-vishal.moola@gmail.com> References: <20231020183331.10770-1-vishal.moola@gmail.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 4BD11120002 X-Rspam-User: X-Stat-Signature: dhbym7hgkzcwrd37zgemthwceb6exk6t X-Rspamd-Server: rspam01 X-HE-Tag: 1697826826-382685 X-HE-Meta: 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 zTZhl5vW 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Replaces 5 calls to compound_head(), and removes 1385 bytes of kernel text. Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Rik van Riel Reviewed-by: Yang Shi --- mm/khugepaged.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 500756604488..6c4b5af43371 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1248,6 +1248,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, int result = SCAN_FAIL, referenced = 0; int none_or_zero = 0, shared = 0; struct page *page = NULL; + struct folio *folio = NULL; unsigned long _address; spinlock_t *ptl; int node = NUMA_NO_NODE, unmapped = 0; @@ -1334,29 +1335,28 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, } } - page = compound_head(page); - + folio = page_folio(page); /* * Record which node the original page is from and save this * information to cc->node_load[]. * Khugepaged will allocate hugepage from the node has the max * hit record. */ - node = page_to_nid(page); + node = folio_nid(folio); if (hpage_collapse_scan_abort(node, cc)) { result = SCAN_SCAN_ABORT; goto out_unmap; } cc->node_load[node]++; - if (!PageLRU(page)) { + if (!folio_test_lru(folio)) { result = SCAN_PAGE_LRU; goto out_unmap; } - if (PageLocked(page)) { + if (folio_test_locked(folio)) { result = SCAN_PAGE_LOCK; goto out_unmap; } - if (!PageAnon(page)) { + if (!folio_test_anon(folio)) { result = SCAN_PAGE_ANON; goto out_unmap; } @@ -1371,7 +1371,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, * has excessive GUP pins (i.e. 512). Anyway the same check * will be done again later the risk seems low. */ - if (!is_refcount_suitable(page)) { + if (!is_refcount_suitable(&folio->page)) { result = SCAN_PAGE_COUNT; goto out_unmap; } @@ -1381,8 +1381,8 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, * enough young pte to justify collapsing the page */ if (cc->is_khugepaged && - (pte_young(pteval) || page_is_young(page) || - PageReferenced(page) || mmu_notifier_test_young(vma->vm_mm, + (pte_young(pteval) || folio_test_young(folio) || + folio_test_referenced(folio) || mmu_notifier_test_young(vma->vm_mm, address))) referenced++; } @@ -1404,7 +1404,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, *mmap_locked = false; } out: - trace_mm_khugepaged_scan_pmd(mm, page, writable, referenced, + trace_mm_khugepaged_scan_pmd(mm, &folio->page, writable, referenced, none_or_zero, result, unmapped); return result; } From patchwork Fri Oct 20 18:33:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vishal Moola (Oracle)" X-Patchwork-Id: 13431019 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29D50C001DF for ; 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Both callers only operate on head pages of folios so mapcount/refcount conversions here are trivial. Removes 3 calls to compound head, and removes 315 bytes of kernel text. Signed-off-by: Vishal Moola (Oracle) Reviewed-by: David Hildenbrand Reviewed-by: Yang Shi --- mm/khugepaged.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 6c4b5af43371..9efd8ff68f06 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -524,15 +524,15 @@ static void release_pte_pages(pte_t *pte, pte_t *_pte, } } -static bool is_refcount_suitable(struct page *page) +static bool is_refcount_suitable(struct folio *folio) { int expected_refcount; - expected_refcount = total_mapcount(page); - if (PageSwapCache(page)) - expected_refcount += compound_nr(page); + expected_refcount = folio_mapcount(folio); + if (folio_test_swapcache(folio)) + expected_refcount += folio_nr_pages(folio); - return page_count(page) == expected_refcount; + return folio_ref_count(folio) == expected_refcount; } static int __collapse_huge_page_isolate(struct vm_area_struct *vma, @@ -625,7 +625,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, * but not from this process. The other process cannot write to * the page, only trigger CoW. */ - if (!is_refcount_suitable(&folio->page)) { + if (!is_refcount_suitable(folio)) { folio_unlock(folio); result = SCAN_PAGE_COUNT; goto out; @@ -1371,7 +1371,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm, * has excessive GUP pins (i.e. 512). Anyway the same check * will be done again later the risk seems low. */ - if (!is_refcount_suitable(&folio->page)) { + if (!is_refcount_suitable(folio)) { result = SCAN_PAGE_COUNT; goto out_unmap; } From patchwork Fri Oct 20 18:33:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vishal Moola (Oracle)" X-Patchwork-Id: 13431020 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66BC4C004C0 for ; Fri, 20 Oct 2023 18:33:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 68648800C5; Fri, 20 Oct 2023 14:33:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6356780044; Fri, 20 Oct 2023 14:33:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 41329800C5; 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This removes 1 call to compound_head() and helps convert khugepaged to use folios throughout. Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Rik van Riel Reviewed-by: Yang Shi --- include/linux/memcontrol.h | 14 -------------- mm/khugepaged.c | 17 ++++++++++------- 2 files changed, 10 insertions(+), 21 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index ab94ad4597d0..3126bde982e8 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1080,15 +1080,6 @@ static inline void count_memcg_events(struct mem_cgroup *memcg, local_irq_restore(flags); } -static inline void count_memcg_page_event(struct page *page, - enum vm_event_item idx) -{ - struct mem_cgroup *memcg = page_memcg(page); - - if (memcg) - count_memcg_events(memcg, idx, 1); -} - static inline void count_memcg_folio_events(struct folio *folio, enum vm_event_item idx, unsigned long nr) { @@ -1565,11 +1556,6 @@ static inline void __count_memcg_events(struct mem_cgroup *memcg, { } -static inline void count_memcg_page_event(struct page *page, - int idx) -{ -} - static inline void count_memcg_folio_events(struct folio *folio, enum vm_event_item idx, unsigned long nr) { diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 9efd8ff68f06..6a7184cd291b 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -888,16 +888,16 @@ static int hpage_collapse_find_target_node(struct collapse_control *cc) } #endif -static bool hpage_collapse_alloc_page(struct page **hpage, gfp_t gfp, int node, +static bool hpage_collapse_alloc_folio(struct folio **folio, gfp_t gfp, int node, nodemask_t *nmask) { - *hpage = __alloc_pages(gfp, HPAGE_PMD_ORDER, node, nmask); - if (unlikely(!*hpage)) { + *folio = __folio_alloc(gfp, HPAGE_PMD_ORDER, node, nmask); + + if (unlikely(!*folio)) { count_vm_event(THP_COLLAPSE_ALLOC_FAILED); return false; } - folio_prep_large_rmappable((struct folio *)*hpage); count_vm_event(THP_COLLAPSE_ALLOC); return true; } @@ -1064,17 +1064,20 @@ static int alloc_charge_hpage(struct page **hpage, struct mm_struct *mm, int node = hpage_collapse_find_target_node(cc); struct folio *folio; - if (!hpage_collapse_alloc_page(hpage, gfp, node, &cc->alloc_nmask)) + if (!hpage_collapse_alloc_folio(&folio, gfp, node, &cc->alloc_nmask)) { + *hpage = NULL; return SCAN_ALLOC_HUGE_PAGE_FAIL; + } - folio = page_folio(*hpage); if (unlikely(mem_cgroup_charge(folio, mm, gfp))) { folio_put(folio); *hpage = NULL; return SCAN_CGROUP_CHARGE_FAIL; } - count_memcg_page_event(*hpage, THP_COLLAPSE_ALLOC); + count_memcg_folio_events(folio, THP_COLLAPSE_ALLOC, 1); + + *hpage = folio_page(folio, 0); return SCAN_SUCCEED; } From patchwork Fri Oct 20 18:33:31 2023 Content-Type: text/plain; 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[73.170.51.167]) by smtp.googlemail.com with ESMTPSA id z14-20020aa7990e000000b006b4ac8885b4sm1911345pff.14.2023.10.20.11.33.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 11:33:47 -0700 (PDT) From: "Vishal Moola (Oracle)" To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, "Vishal Moola (Oracle)" Subject: [PATCH v3 5/5] mm/khugepaged: Convert collapse_pte_mapped_thp() to use folios Date: Fri, 20 Oct 2023 11:33:31 -0700 Message-Id: <20231020183331.10770-6-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231020183331.10770-1-vishal.moola@gmail.com> References: <20231020183331.10770-1-vishal.moola@gmail.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 162E080022 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 3jor3tr4w5nm4wrz4nx86iac8j6qgraq X-HE-Tag: 1697826828-604334 X-HE-Meta: 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 +dqoT1E/ BQvefgK/XWbDzvbleTH/gpb/e+bEfr3KWlEJ0gObgTJo9s8KhzzilL4JX7kl3f0jFRv+/NCZM4UYu2pT4ikz+qfTSyUio5mrN58QkfiUGaFUy5Ju3tgngWlpIi/2RP98tTDvH4hdnyeGDRpec9jM5v+VtyjcK44ddm889MHOfcjJ0wdABvWOPdmKzcWlXvEl0mT8I9thTkaEfroFD9qBNtdUdlrNR+IPCzGu/JbB+UNJMSjTW0PnBKV3/R4exVBodNF1aLA87lep1ps0QaT72mGvmialJuKPn8y5zYnft+lyKu3xw7m/c+VbLPMX+1ASJ3vgG7FKkFf1QEfctlfv8fbHU4bBGlUGGIuqlEbNw3yVI09zoE6AWwa6Sr3FPybSURRAcx3lYv9lj9sc4iQ2XOsFWvoTeEPlphmHSOuMlMu2oz1B+zIWg69CI0bjDvlaPLzwWHIxVJEsy1ebxnqQ2ORB8c9UT/WY+xA/yw+GCmK1QxlTWSlPCseayaveR2Sr90EZ5zgGM2TH2y+tpwTMp5RimqyxZoUZ7eBtY9gYwGjGb89zXUmvmJq7G38WoawykTSIIWSt7Gsxc5JRmK5PlJJxvhQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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. Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Rik van Riel Reviewed-by: Yang Shi --- mm/khugepaged.c | 45 ++++++++++++++++++++------------------------- 1 file changed, 20 insertions(+), 25 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 6a7184cd291b..bc2d8ff269c7 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1477,7 +1477,7 @@ int collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr, 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_struct *mm, unsigned long addr, 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_struct *mm, unsigned long addr, */ 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_struct *mm, unsigned long addr, * 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_struct *mm, unsigned long addr, * 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_struct *mm, unsigned long addr, 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_struct *mm, unsigned long addr, 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_struct *mm, unsigned long addr, /* 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_struct *mm, unsigned long addr, 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 @@ int collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr, 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; }