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b=gkxHyt5A8udro5GTv6E1KYahAMFj5L7vsu05TMHtUr8KCgDFke79bpkrsHB20vgBP OaItxE+Pci8Wp4HIN2U/Fy5WT2F/5EcJLaIPxPSnja9GuR/wSeGOObxGLNRuzQ1NNR beR+yQLrWw2JQQT9Pd09OkioCWr9YC+1rBbi/KajsVIjXS+ZozLepELqHAjW5Uataz 6tp7Fo1CCSdI7RyOXrBlFo1X7E/UqHeYhkPrYF434pYFmzm/gIc1l9LhE6wFzj5y/n afrxyu2x0Z0js+rlSvNgcw9vHeg3MaT39BD4dSa2NiIoMdva4KQbdw5MBIv4WTiAnw 8Rle5hCEjof2A== Message-ID: <17c5f031-17e5-44c3-b572-ee224cb294cd@kernel.org> Date: Tue, 16 Jun 2026 15:54:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 08/12] mm/swapfile: Add batched version of folio_put_swap To: Dev Jain , akpm@linux-foundation.org, ljs@kernel.org, chrisl@kernel.org, kasong@tencent.com, hughd@google.com, liam@infradead.org Cc: riel@surriel.com, vbabka@kernel.org, harry@kernel.org, jannh@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, bhe@redhat.com, youngjun.park@lge.com, baolin.wang@linux.alibaba.com, pfalcato@suse.de, ryan.roberts@arm.com, anshuman.khandual@arm.com References: <20260526063635.61721-1-dev.jain@arm.com> <20260526063635.61721-9-dev.jain@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 6054A1C0003 X-Stat-Signature: eyzxgw511x6jhug5gbybhw8bddps1m3q X-HE-Tag: 1781618085-886927 X-HE-Meta: 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 0fYf4ymb zu9MnYQHhfjWdj/GQ1ZuvGeDqt621xxdFd2wI/l8ChoPqoj7d9hPCGehcG4br5ucix8rMo8guN5LRuSXTpRlbVTiXErDIx8+9E81eMUDnLTMJSgahZVMRtgiwzwQQk4S4w/aW2jrJ+66tll3Bnyqh7/0c9ctCJRDKbCD38J25CbvzhdeB1fRmDcHxZsLYRcGpqncMC3xo6giUyArwKLN42WQ9PK4q8xIADTC9Ftmima4mnG8Lh1PPThWfB9ifRv/aoNKwcc/+vCshCagivniFLfaXXRlfBcf7ps+eytSeBG3zv75sJ1izZwyFSVEEUY6lImnK1tO2Bu234/+B00FG6t5yTZJvG7M0aqZpIcp5MzteIpv8hfJ1OBUzotjZgVMxLIiXorULK6g3k20= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/26/26 08:36, Dev Jain wrote: > Add folio_put_swap_pages to handle a batch of consecutive pages. Note > that folio_put_swap already can handle a subset of this: nr_pages == 1 and > nr_pages == folio_nr_pages(folio). Generalize this to any nr_pages. > > Currently we have a not-so-nice logic of passing in subpage == NULL if > we mean to exercise the logic on the entire folio, and subpage != NULL if > we want to exercise the logic on only that subpage. Remove this > indirection: the caller invokes folio_put_swap_pages() if it wants to > operate on a range of pages in the folio (i.e nr_pages may be anything > between 1 till folio_nr_pages()), and invokes folio_put_swap() if it "between 1 and folio_nr_pages()" ? > wants to operate on the entire folio. > > Signed-off-by: Dev Jain > --- [...] > +++ b/mm/swap.h > @@ -208,7 +208,8 @@ extern int swap_retry_table_alloc(swp_entry_t entry, gfp_t gfp); > int folio_alloc_swap(struct folio *folio); > int folio_dup_swap_pages(struct folio *folio, struct page *page, > unsigned long nr_pages); > -void folio_put_swap(struct folio *folio, struct page *page); > +void folio_put_swap_pages(struct folio *folio, struct page *page, > + unsigned long nr_pages); Nit \tab\tab (same below) > > /* For internal use */ > extern void __swap_cluster_free_entries(struct swap_info_struct *si, > @@ -397,7 +398,8 @@ static inline int folio_dup_swap_pages(struct folio *folio, struct page *page, > return -EINVAL; > } > [...] > > swap_put_entries_cluster(si, swp_offset(entry), nr_pages, false); > } > @@ -2499,7 +2497,8 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd, > new_pte = pte_mkuffd_wp(new_pte); > setpte: > set_pte_at(vma->vm_mm, addr, pte, new_pte); > - folio_put_swap(swapcache, folio_file_page(swapcache, swp_offset(entry))); > + folio_put_swap_pages(swapcache, > + folio_file_page(swapcache, swp_offset(entry)), 1); > out: > if (pte) > pte_unmap_unlock(pte, ptl); We could consider having a simple folio_put_swap_page() helper. But maybe most of these will be converted to batching in the long run either way. Acked-by: David Hildenbrand (Arm) -- Cheers, David