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 OvvPSiRX 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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: List-Subscribe: List-Unsubscribe: David Hildenbrand writes: > On 10.07.25 02:59, Ankur Arora wrote: >> folio_zero_user() is constrained to clear in a page-at-a-time >> fashion because it supports CONFIG_HIGHMEM which means that kernel >> mappings for pages in a folio are not guaranteed to be contiguous. >> We don't have this problem when running under configurations with >> CONFIG_CLEAR_PAGE_EXTENT (implies !CONFIG_HIGHMEM), so zero in >> longer page-extents. >> This is expected to be faster because the processor can now optimize >> the clearing based on the knowledge of the extent. >> > > I'm curious: how did we end up "page extent" terminology? :) After trying all the others! I tried multi-page and contig_clear_pages and finally decided to go with page-extent since clear_pages() essentially takes a page-extent as an argument. > "CONFIG_CLEAR_CONTIG_PAGES" or sth. like that would be a bit clearer (pun > intended), at least to me. Oddly enough I tried CONFIG_CONTIG_CLEAR_PAGES and CONFIG_CLEAR_PAGES_CONTIG but those read a little awkwardly. CONFIG_CLEAR_CONTIG_PAGES reads better. Should have tried moving the CONTIG to the middle as well :D. > We use "CONTIG" pages already in different MM context. > > "page extent" reminds of "page_ext", which is "page extension" ... Yeah I see that in the Kconfig now. Will switch to this one. Thanks -- ankur