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AJvYcCWB9spI7Kty6d5uZgtgCxI9CwDOPJ0U2ruA5OW0+WiGxNdmdkCZMV4hA8Vw4m3lXp3vJt93fnZEdA==@kvack.org X-Gm-Message-State: AOJu0YxA2qTO7UdRxAsMwyd2V8344kgsK3j6/rMeJbJqwBjfF8MxXrsM xSZNn8T6gGYqODrNQCPmHDHVHVklJEXyp4pIyjYio/qxce7rI5uzHbTzSTgh6KeDPZ4jEPZD3zf xOzCAe1qGwMVfjFP/lseLSNcFCCE= X-Gm-Gg: ASbGncs3Y6VvLfRx24WEutRL0KKmYYs2e1R4zXYhJqXpLSMrd6RrZcxMjuUFd6sBztx kWTubA+A1rImcsbWY9CNeMORoYhfBQ20epneeXSbKhxOxjGRaE9eZ4SUu1f5jwJ/JlfpWMQ8KxK 7Ar8ixJPadlqFNQ8hNBhcqoQ== X-Google-Smtp-Source: AGHT+IEQmCH6dK55zXOkds/ZHDMnczRyVqU6As+1fkm66BRqyj6QpVHUWogFcNW2HSeh3J4QkVBTphwhdwBXfd/xI2o= X-Received: by 2002:a05:6000:1fa4:b0:391:319c:1950 with SMTP id ffacd0b85a97d-39132d0539dmr704892f8f.8.1741303732207; Thu, 06 Mar 2025 15:28:52 -0800 (PST) MIME-Version: 1.0 References: <20250306074056.246582-1-s.suk@samsung.com> In-Reply-To: From: Jaewon Kim Date: Fri, 7 Mar 2025 08:28:41 +0900 X-Gm-Features: AQ5f1JopaLOUpTwxdPg5AfqwLDYqWbHBUyR2VJnXqln5-8Dd2-m6QI-_lvHe4-8 Message-ID: Subject: Re: [RFC PATCH] block, fs: use FOLL_LONGTERM as gup_flags for direct IO To: Christoph Hellwig Cc: Sooyong Suk , viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, spssyr@gmail.com, "axboe@kernel.dk" , linux-block@vger.kernel.org, dhavale@google.com, surenb@google.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: EE43540006 X-Stat-Signature: 4g4ffekg1hk7jxx9g1byebusqfjj3hi8 X-HE-Tag: 1741303733-134306 X-HE-Meta: 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 fiEt7BNm 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000039, 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 Fri, Mar 7, 2025 at 12:26=E2=80=AFAM Christoph Hellwig wrote: > > On Thu, Mar 06, 2025 at 04:40:56PM +0900, Sooyong Suk wrote: > > There are GUP references to pages that are serving as direct IO buffers= . > > Those pages can be allocated from CMA pageblocks despite they can be > > pinned until the DIO is completed. > > direct I/O is eactly the case that is not FOLL_LONGTERM and one of > the reasons to even have the flag. So big fat no to this. > Hello, thank you for your comment. We, Sooyong and I, wanted to get some opinions about this FOLL_LONGTERM for direct I/O as CMA memory got pinned pages which had been pinned from direct io. > You also completely failed to address the relevant mailinglist and > maintainers. I added block maintainer Jens Axboe and the block layer maillinst here, and added Suren and Sandeep, too.