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[2003:cb:c71c:a700:bba7:849a:ecf1:5404]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434aa76a8e0sm84214255e9.15.2024.11.29.05.11.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Nov 2024 05:11:18 -0800 (PST) Message-ID: <8376a446-1e8d-4359-ac69-626790ebcd97@redhat.com> Date: Fri, 29 Nov 2024 14:11:16 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf: map pages in advance To: Lorenzo Stoakes Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox References: <20241128113714.492474-1-lorenzo.stoakes@oracle.com> <9f9fd840-6421-43b5-9a12-edfa96e067cc@redhat.com> <1af66528-0551-4735-87f3-d5feadadf33a@lucifer.local> <926b3829-784f-47b8-9903-ea7b9ad484ac@redhat.com> <31e8202d-f3db-4dcd-a988-2f531b14e40f@lucifer.local> <84fed269-3f82-47f7-89cb-671fcee5a23a@redhat.com> <03f654d5-424a-4d23-828e-323aff46fa61@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Well, a bit of both :) > > As I say below, we can't use VM_MIXEDMAP as it's broken for our case (we > have to use page->mapping if there's a struct page), so I think _right now_ > this is the only sane solution. I'm not so sure ... I've also been wondering whether this particular user really wants to allocate and work on folios for the time being :/ Putting aside the remainder of what we discuss further below for now, I've just been wondering if we could somehow have two mappings with two separate ops. The one for the single R/W page, the other for the R/O pages ... ... but I'm not sure yet if that would completely help. ... still trying to grasp all the details here, and how to keep GUP working. -- Cheers, David / dhildenb