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Howlett" , Nikita Kalyazin , Ackerley Tng , Vishal Annapurve , Fuad Tabba , akpm@linux-foundation.org, pbonzini@redhat.com, shuah@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, muchun.song@linux.dev, hughd@google.com, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, jack@suse.cz, jannh@google.com, ryan.roberts@arm.com, jthoughton@google.com, peterx@redhat.com, graf@amazon.de, jgowans@amazon.com, roypat@amazon.co.uk, derekmn@amazon.com, nsaenz@amazon.es, xmarcalx@amazon.com Subject: Re: [PATCH v3 0/6] KVM: guest_memfd: support for uffd minor Message-ID: <4a32724c-0891-4ce5-81b1-dfce9cfb91f2@lucifer.local> References: <20250404154352.23078-1-kalyazin@amazon.com> <2iggdfimgfke5saxs74zmfrswgrxmmsyxzphq4mdfpj54wu4pl@5uiia4pzkxem> <63j2cdjh6oxzb5ehtetiaolobp6zzev7emgqvvfkf5tuwlnspx@7h5u4nrqwvsc> <2bohfxnbthvf3w4kz5u72wj5uxh5sb5s3mbhdk5eg2ingkpkqg@ylykphugpydy> 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 P6MXSpbo 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000074, 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 Mon, Apr 07, 2025 at 04:46:48PM +0200, David Hildenbrand wrote: > On 07.04.25 16:24, Liam R. Howlett wrote: > > * Nikita Kalyazin [250407 10:05]: > > > > > > > ... > > > > > > > > > > All of this is extremely confusing because the onus of figuring out what > > > > the final code will look like is put on the reviewer. As it is, we have > > > > issues with people not doing enough review of the code (due to limited > > > > time). One way to get reviews is to make the barrier of entry as low as > > > > possible. > > > > > > > > I spent Friday going down a rabbit hole of patches referring to each > > > > other as dependencies and I gave up. It looks like I mistook one set of > > > > patches as required vs them requiring the same in-flight ones as your > > > > patches. > > > > > > > > I am struggling to see how we can adequately support all of you given > > > > the way the patches are sent out in batches with dependencies - it is > > > > just too time consuming to sort out. > > > > > > I'm happy to do whatever I can to make the review easier. I suppose the > > > extreme case is to wait for the dependencies to get accepted, effectively > > > serialising submissions, but that slows the process down significantly. For > > > example, I received very good feedback on v1 and v2 of this series and was > > > able to address it instead of waiting for the dependency. Would including > > > the required patches directly in the series help? My only concern is in > > > that case the same patch will be submitted multiple times (as a part of > > > every depending series), but if it's better, I'll be doing that instead. > > > > Don't resend patches that someone else is upstreaming, that'll cause > > other problems. > > > > Three methods come to mind: > > > > 1. As you stated, wait for the dependencies to land. This is will mean > > what you are working against is well tested and won't change (and you > > won't have to re-spin due to an unstable base). > > > > 2. Combine them into a bigger patch set. I can then pull one patch set > > and look at the parts of interest to the mm side. > > > > 3. Provide a git repo with the necessary changes together. > > > > I think 2 and 3 together should be used for the guest_memfd patches. > > Someone needs to be managing these to send upstream. See the discussion > > in another patch set on guest_memfd here [1]. > > The issue is that most extensions are fairly independent from each other, > except that they built up on Fuad's mmap support, > > Sending all together as one thing might not be the best option. > > Once basic mmap support is upstream, some of the extensions (e.g., directmap > removal) can go in next. > > So until that is upstream, I agree that tagging the stuff that builds up on > that is the right thing to do, and providing git trees is another very good > idea. > > I'll prioritize getting Fuad's mmap stuff reviewed. (I keep saying that, I > know) Which series is this? Sorry maybe lost track of this one. > > -- > Cheers, > > David / dhildenb >