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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: B69F02000B X-Stat-Signature: oeatkobfx4su1gdkojx7tw7bqr3qu8rn X-Rspam-User: X-HE-Tag: 1751364657-810162 X-HE-Meta: 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 64t2pxyD 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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: On 01.07.25 11:24, David Hildenbrand wrote: > On 30.06.25 19:05, Lorenzo Stoakes wrote: >> On Mon, Jun 30, 2025 at 02:59:50PM +0200, David Hildenbrand wrote: >>> Let's factor it out, simplifying the calling code. >>> >>> The assumption is that flush_dcache_page() is not required for >>> movable_ops pages: as documented for flush_dcache_folio(), it really >>> only applies when the kernel wrote to pagecache pages / pages in >>> highmem. movable_ops callbacks should be handling flushing >>> caches if ever required. >> >> But we've enot changed this have we? The flush_dcache_folio() invocation seems >> to happen the same way now as before? Did I miss something? > > I think, before this change we would have called it also for movable_ops > pages > > > if (rc == MIGRATEPAGE_SUCCESS) { > if (__folio_test_movable(src)) { > ... > } > > ... > > if (likely(!folio_is_zone_device(dst))) > flush_dcache_folio(dst); > } > > Now, we no longer do that for movable_ops pages. > > For balloon pages, we're not copying anything, so we never possibly have > to flush the dcache. > > For zsmalloc, we do the copy in zs_object_copy() through kmap_local. > > I think we could have HIGHMEM, so I wonder if we should just do a > flush_dcache_page() in zs_object_copy(). > > At least, staring at highmem.h with memcpy_to_page(), it looks like that > might be the right thing to do. > > > So likely I'll add a patch before this one that will do the > flush_dcache_page() in there. But reading the docs again: "This routine need only be called for page cache pages which can potentially ever be mapped into the address space of a user process." So, not required IIUC. I'll clarify in the patch description. -- Cheers, David / dhildenb