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[2003:cb:c738:1900:b6ea:5b9:62c0:34e]) by smtp.gmail.com with ESMTPSA id g16-20020a05600c311000b0040651505684sm9310909wmo.29.2023.10.23.05.03.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Oct 2023 05:03:17 -0700 (PDT) Message-ID: <1156ad46-1952-4892-8092-bfbb8588c3f3@redhat.com> Date: Mon, 23 Oct 2023 14:03:15 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/3] userfaultfd: UFFDIO_MOVE uABI To: Peter Xu Cc: Suren Baghdasaryan , Lokesh Gidra , akpm@linux-foundation.org, viro@zeniv.linux.org.uk, brauner@kernel.org, shuah@kernel.org, aarcange@redhat.com, hughd@google.com, mhocko@suse.com, axelrasmussen@google.com, rppt@kernel.org, willy@infradead.org, Liam.Howlett@oracle.com, jannh@google.com, zhangpeng362@huawei.com, bgeffon@google.com, kaleshsingh@google.com, ngeoffray@google.com, jdduke@google.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@android.com References: <12588295-2616-eb11-43d2-96a3c62bd181@redhat.com> <8d187891-f131-4912-82d8-13112125b210@redhat.com> <81cf0943-e258-494c-812a-0c00b11cf807@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 3DFDF40006 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: chrmwon9trcxptwfng34mdtqmhtdgfzz X-HE-Tag: 1698062601-414636 X-HE-Meta: U2FsdGVkX1+25uvQaTVlzUEPurs3GH/O3fEv4D1lWxlNhnBBJEIZ+etL8dSl0EjLcWe6wTLyZgv/qNmJz8yue2eaPzMhkJ0ktzoD2RUx9PGDfXWRn8CjAXMlspvr1qiwlOaF2Cds/V1bPwRAx1NtTrS4fQxnX+k5gXwle1N5l5LPFWbuVIG+QvyZrAc0YXfCndXQylATGq2nSHMt5k5yn9Eda8fJSwWPIHjHRiRQqOalJqTsNFuS1x+A4O4IesKTPyG2MLN964WqBc6sAP7LympR598zfaVM27BzLIHQCoHdH9cQtobPi0giLAvTA49ujYn2uSQzUFo35PM1Zt5n5rMODo4/Vta8KgFuIqK+2FT8bwScZew61lmBnV/y1iQd95zoJpvw2mFvxF8RCbaTlu2aR9mqpjLmfd1X6XEu4WZ9rx/RFtuP643kdn1P5/qIBj6Ps3GGvNQT1a4BrbSiQ8obq27g81WZN5qdAaG9Z9HwK40ObzlRaZvlH/5wAJoKmus/DvtMBAGc85iGgOKnTvhLq5qC1zEx0g5q6eU5CbvFg6FJEU9T9mUZNG7Rb0RF++km5+WDVR8aOsbIzDdw28V4VisIgutme2dBwY5uvQq8jp5rrhwILNTh55M8SaGT/Mn1nNgg/peJ2FiYIe4ZsHmkbpj3Z/zBWHi5DfPgBXmDBBV0QzaBqTNWS9zH4FSSnHf8vWcELlVbcdIj1sDV2gfZg9dRlozT4R2Fl1hUhtgRRYErdnOqYUa5ic1rXELAUM2pop1itnJsifd5LMkcaSXI0bf+V43yfT/J+0oZ8aqFWp1UbEx3YJUBYHVdii/QyGs+mLzMAEciJpAqNtA28VgtV2DVtkCDrA4ESbzaJzp37LGtumXeZAPS7eL39EIke3VZ3slxxuzYD8T/l+dHRyJQdOAhvjWMevWvw2sE/Y0qgvMKsGbUlBEiM88leUjEsq6II48dRD5O61v/2ty OrujMbzL 4OlZp/sfHpfO+wT9ClfEPfyJ2JkZzK+xzVyRv3TDiVbpc6nAP5/TnqNJVraevmew+ZsXB4/c0Bw5Nz4/uE59m2hjGiZZhQGOJghbJUYk9yQ2GjKO649nnTgzrFZd+zFY6b+Su/173jktWHXUXB9rZfsxBADQ2XazmdYkn5aRIyR8/77+fBIcKVTrB7LP3mUIUSqaqyCU4QnHRSR641SHz4MNmefJwpNacLkskqCM8QiHMRXuvF/JRnl+egr7U8T9KK1so3qDvaTSst+0Uu/Gj74jUkM2pATaDan44UeVbSwXylwKrR/67w16tvhddQz4BHubsOxH9i0RlrPmEoEc8BCwH/z7orCp2yDRtvcA6e3cFgycZdKYADOQtO8+5uszrNg1UpQshbVWWdGn6mct6CPTVaA6tWzXTwnpeCuNGD/x6SjeIjnLb7cOqXcq6xr+mOKNg0ONKztmQ2i6qM9oBlgUw9g== 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 22.10.23 17:46, Peter Xu wrote: > On Fri, Oct 20, 2023 at 07:16:19PM +0200, David Hildenbrand wrote: >> These are rather the vibes I'm getting from Peter. "Why rename it, could >> confuse people because the original patches are old", "Why exclude it if it >> has been included in the original patches". Not the kind of reasoning I can >> relate to when it comes to upstreaming some patches. > > You can't blame anyone if you misunderstood and biased the question. > > The first question is definitely valid, even until now. You guys still > prefer to rename it, which I'm totally fine with. > > The 2nd question is wrong from your interpretation. That's not my point, > at least not starting from a few replies already. What I was asking for is > why such page movement between mm is dangerous. I don't think I get solid > answers even until now. > > Noticing "memcg is missing" is not an argument for "cross-mm is dangerous", > it's a review comment. Suren can address that. > > You'll propose a new feature that may tag an mm is not an argument either, > if it's not merged yet. We can also address that depending on what it is, > also on which lands earlier. > > It'll be good to discuss these details even in a single-mm support. Anyone > would like to add that can already refer to discussion in this thread. > > I hope I'm clear. > I said everything I had to say, go read what I wrote. -- Cheers, David / dhildenb