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 6xPQGc0Q 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000005, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Jan 08, 2025 at 10:12:36PM +0100, David Hildenbrand wrote: > On 08.01.25 21:54, Matthew Wilcox wrote: > > On Wed, Jan 08, 2025 at 09:14:53PM +0100, David Hildenbrand wrote: > > > On 08.01.25 18:32, Matthew Wilcox wrote: > > > > On Wed, Jan 08, 2025 at 04:18:42PM +0000, Lorenzo Stoakes wrote: > > > > > @@ -280,7 +269,10 @@ static void fb_deferred_io_work(struct work_struct *work) > > > > > struct folio *folio = page_folio(pageref->page); > > > > > folio_lock(folio); > > > > > - folio_mkclean(folio); > > > > > + rmap_wrprotect_file_page(fbdefio->mapping, > > > > > + pageref->offset >> PAGE_SHIFT, > > > > > + compound_nr(pageref->page), > > > > > + page_to_pfn(pageref->page)); > > > > > folio_unlock(folio); > > > > > > > > Why do we need to lock the folio? (since this isn't necessarily a > > > > folio) > > > > > > Can you clarify the "since this isn't necessarily a folio" part ? Do you > > > mean in the future, when we split "struct page" and "struct folio"? > > > > Right. I need to finish the email that explains where I think we're > > going in 2025 ... > > > > > Doing an rmap walk on something that won't be a folio is ... sounds odd > > > (->wrong :) ) > > > > Not necessarily! We already do that (since 2022) for DAX (see > > 6a8e0596f004). rmap lets you find every place that a given range > > of a file is mapped into user address spaces; but that file might be a > > device file, and so it's not just pagecache but also (in this case) > > fb memory, and whatever else device drivers decide to mmap. > > Yes, that part I remember. > > I thought we would be passing in a page into rmap_wrprotect_file_page(), and > was wondering what we would do to "struct page" that won't be a folio in > there. The reason I provide a PFN is that we internally use a PFN for the walk, and everything else is folio-fied for stuff that isn't necessarily a folio. However it does seem silly to have to page_to_pfn() a page that we pass in, so I will update to accept a page and do this bit in the function itself. > > Probably, because the "_page" in rmap_wrprotect_file_page() is misleading :) > > ... should it be "file_range" ? (but we also pass the pfn ... ) > > -- > Cheers, > > David / dhildenb >