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[2003:d8:2f3e:5900:27aa:5f4a:b65c:3d3c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a0b300873dsm6766886f8f.78.2025.05.08.03.55.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 May 2025 03:55:51 -0700 (PDT) Message-ID: <0979ce4e-d316-477c-872e-d3f9e47690e5@redhat.com> Date: Thu, 8 May 2025 12:55:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] mm: Add generic helper to hint a large folio To: Dev Jain , akpm@linux-foundation.org Cc: Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, pfalcato@suse.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, peterx@redhat.com, ryan.roberts@arm.com, mingo@kernel.org, libang.li@antgroup.com, maobibo@loongson.cn, zhengqi.arch@bytedance.com, baohua@kernel.org, anshuman.khandual@arm.com, willy@infradead.org, ioworker0@gmail.com, yang@os.amperecomputing.com References: <20250506050056.59250-1-dev.jain@arm.com> <20250506050056.59250-3-dev.jain@arm.com> <887fb371-409e-4dad-b4ff-38b85bfddf95@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 88E4FC0007 X-Rspam-User: X-Stat-Signature: 7kcukzx5kums3mi3ynm11if7jw7e9dzw X-HE-Tag: 1746701755-10811 X-HE-Meta: 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 YhzLYmWR j6k5nMfv3KQDHcV4qveTrLjoDdeRXj1S0dNqekotoOmMFS5JDdhJz6lW0HEhwXiMfdIiTPmRyE7nl0yg= 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: List-Subscribe: List-Unsubscribe: >> (2) Do we really need "must be part of the same folio", or could be just >> batch over present >> ptes that map consecutive PFNs? In that case, a helper that avoids >> folio_pte_batch() completely >> might be better. >> > I am not sure I get you here. folio_pte_batch() seems to be the simplest > thing we can do as being done around in the code elsewhere, I am not > aware of any alternate. If we don't need the folio, then we can have a batching function that doesn't require the folio. Likely, we could even factor that (non-folio batching) out from folio_pte_batch(). The recent fix [1] might make that easier. See below. So my question is: is something relying on all of these PTEs to point at the same folio? [1] https://lkml.kernel.org/r/20250502215019.822-2-arkamar@atlas.cz Something like this: (would need kerneldoc, probably remove "addr" parameter from folio_pte_batch(), and look into other related cleanups as discussed with Andrew) From f56f67ee5ae9879adb99a8da37fa7ec848c4d256 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Thu, 8 May 2025 12:53:52 +0200 Subject: [PATCH] tmp Signed-off-by: David Hildenbrand --- mm/internal.h | 84 ++++++++++++++++++++++++++++----------------------- 1 file changed, 46 insertions(+), 38 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 25a29872c634b..53ff8f8a7c8f9 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -217,36 +217,8 @@ static inline pte_t __pte_batch_clear_ignored(pte_t pte, fpb_t flags) return pte_wrprotect(pte_mkold(pte)); } -/** - * folio_pte_batch - detect a PTE batch for a large folio - * @folio: The large folio to detect a PTE batch for. - * @addr: The user virtual address the first page is mapped at. - * @start_ptep: Page table pointer for the first entry. - * @pte: Page table entry for the first page. - * @max_nr: The maximum number of table entries to consider. - * @flags: Flags to modify the PTE batch semantics. - * @any_writable: Optional pointer to indicate whether any entry except the - * first one is writable. - * @any_young: Optional pointer to indicate whether any entry except the - * first one is young. - * @any_dirty: Optional pointer to indicate whether any entry except the - * first one is dirty. - * - * Detect a PTE batch: consecutive (present) PTEs that map consecutive - * pages of the same large folio. - * - * All PTEs inside a PTE batch have the same PTE bits set, excluding the PFN, - * the accessed bit, writable bit, dirty bit (with FPB_IGNORE_DIRTY) and - * soft-dirty bit (with FPB_IGNORE_SOFT_DIRTY). - * - * start_ptep must map any page of the folio. max_nr must be at least one and - * must be limited by the caller so scanning cannot exceed a single page table. - * - * Return: the number of table entries in the batch. - */ -static inline int folio_pte_batch(struct folio *folio, unsigned long addr, - pte_t *start_ptep, pte_t pte, int max_nr, fpb_t flags, - bool *any_writable, bool *any_young, bool *any_dirty) +static inline int pte_batch(pte_t *start_ptep, pte_t pte, int max_nr, + fpb_t flags, bool *any_writable, bool *any_young, bool *any_dirty) { pte_t expected_pte, *ptep; bool writable, young, dirty; @@ -259,14 +231,6 @@ static inline int folio_pte_batch(struct folio *folio, unsigned long addr, if (any_dirty) *any_dirty = false; - VM_WARN_ON_FOLIO(!pte_present(pte), folio); - VM_WARN_ON_FOLIO(!folio_test_large(folio) || max_nr < 1, folio); - VM_WARN_ON_FOLIO(page_folio(pfn_to_page(pte_pfn(pte))) != folio, folio); - - /* Limit max_nr to the actual remaining PFNs in the folio we could batch. */ - max_nr = min_t(unsigned long, max_nr, - folio_pfn(folio) + folio_nr_pages(folio) - pte_pfn(pte)); - nr = pte_batch_hint(start_ptep, pte); expected_pte = __pte_batch_clear_ignored(pte_advance_pfn(pte, nr), flags); ptep = start_ptep + nr; @@ -300,6 +264,50 @@ static inline int folio_pte_batch(struct folio *folio, unsigned long addr, return min(nr, max_nr); } +/** + * folio_pte_batch - detect a PTE batch for a large folio + * @folio: The large folio to detect a PTE batch for. + * @addr: The user virtual address the first page is mapped at. + * @start_ptep: Page table pointer for the first entry. + * @pte: Page table entry for the first page. + * @max_nr: The maximum number of table entries to consider. + * @flags: Flags to modify the PTE batch semantics. + * @any_writable: Optional pointer to indicate whether any entry except the + * first one is writable. + * @any_young: Optional pointer to indicate whether any entry except the + * first one is young. + * @any_dirty: Optional pointer to indicate whether any entry except the + * first one is dirty. + * + * Detect a PTE batch: consecutive (present) PTEs that map consecutive + * pages of the same large folio. + * + * All PTEs inside a PTE batch have the same PTE bits set, excluding the PFN, + * the accessed bit, writable bit, dirty bit (with FPB_IGNORE_DIRTY) and + * soft-dirty bit (with FPB_IGNORE_SOFT_DIRTY). + * + * start_ptep must map any page of the folio. max_nr must be at least one and + * must be limited by the caller so scanning cannot exceed a single page table. + * + * Return: the number of table entries in the batch. + */ +static inline int folio_pte_batch(struct folio *folio, unsigned long addr, + pte_t *start_ptep, pte_t pte, int max_nr, fpb_t flags, + bool *any_writable, bool *any_young, bool *any_dirty) +{ + + VM_WARN_ON_FOLIO(!pte_present(pte), folio); + VM_WARN_ON_FOLIO(!folio_test_large(folio) || max_nr < 1, folio); + VM_WARN_ON_FOLIO(page_folio(pfn_to_page(pte_pfn(pte))) != folio, folio); + + /* Limit max_nr to the actual remaining PFNs in the folio we could batch. */ + max_nr = min_t(unsigned long, max_nr, + folio_pfn(folio) + folio_nr_pages(folio) - pte_pfn(pte)); + + return pte_batch(start_ptep, pte, max_nr, flags, any_writable, any_young, + any_dirty); +} + /** * pte_move_swp_offset - Move the swap entry offset field of a swap pte * forward or backward by delta -- 2.49.0 -- Cheers, David / dhildenb