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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.027054, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 在 2025/4/1 17:47, Uladzislau Rezki 写道: > On Tue, Apr 01, 2025 at 02:08:53PM +0800, Huan Yang wrote: >> 在 2025/4/1 11:19, Vishal Moola (Oracle) 写道: >>> On Tue, Apr 01, 2025 at 10:21:46AM +0800, Huan Yang wrote: >>>> 在 2025/4/1 09:50, Vishal Moola (Oracle) 写道: >>>>> On Mon, Mar 31, 2025 at 10:05:53AM +0800, Huan Yang wrote: >>>>>> HI Vishal, >>>>>> >>>>>> 在 2025/3/29 05:13, Vishal Moola (Oracle) 写道: >>>>>>> Currently, users have to call vmap() or vmap_pfn() to map pages to >>>>>>> kernel virtual space. vmap_pfn() is for special pages (i.e. pfns >>>>>>> without struct page). vmap() handles normal pages. >>>>>>> >>>>>>> With large folios, we may want to map ranges that only span >>>>>>> part of a folio (i.e. mapping half of a 2Mb folio). >>>>>>> vmap_file() will allow us to do so. >>>>>> You mention vmap_file can support range folio vmap, but when I look code, I can't figure out >>>>>> >>>>>> how to use, maybe I missed something? :) >>>>> I took a look at the udma-buf code. Rather than iterating through the >>>>> folios using pfns, you can calculate the corresponding file offsets >>>>> (maybe you already have them?) to map the desired folios. >>>> Currently udmabuf folio's not simple based on file(even each memory from memfd). User can provide >>>> >>>> random range of memfd  to udmabuf to use. For example: >>>> >>>> We get a memfd maybe 4M, user split it into [0, 2M), [1M, 2M), [2M, 4M), so you can see 1M-2M range repeat. >>>> >>>> This range can gathered by udmabuf_create_list, then udmabuf use it. So, udmabuf record it by folio array+offset array. Here, :) >>> I was thinking you could call vmap_file() on every sub-range and use >>> those addresses. It should work, we'd have to look at making udmabuf api's >>> support it. >> Hmmm, how to get contigous virtual address? Or there are a way to merge each split vmap's return address? >> > The patch in question maps whole file to continues memory as i see, but > i can miss something. Partly populate technique requires to get an area Hmm, maybe you missed ahead talk, I point above. :) > and partly populate it. > > As i see we have something similar: > > > /** > * vm_area_map_pages - map pages inside given sparse vm_area > * @area: vm_area > * @start: start address inside vm_area > * @end: end address inside vm_area > * @pages: pages to map (always PAGE_SIZE pages) > */ > int vm_area_map_pages(struct vm_struct *area, unsigned long start, > unsigned long end, struct page **pages) > { > ... > > > it is used by the BPF. > > -- > Uladzislau Rezki