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[72.132.29.68]) by smtp.gmail.com with ESMTPSA id f31-20020a631f1f000000b003742e45f7d7sm8492806pgf.32.2022.02.27.13.59.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 27 Feb 2022 13:59:37 -0800 (PST) Message-ID: <8b5b35fa-3c70-adc8-ca3a-4829388c4d12@kernel.dk> Date: Sun, 27 Feb 2022 14:59:35 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Subject: Re: [PATCH 4/6] block, bio, fs: convert most filesystems to pin_user_pages_fast() Content-Language: en-US To: jhubbard.send.patches@gmail.com, Jan Kara , Christoph Hellwig , Dave Chinner , "Darrick J . Wong" , Theodore Ts'o , Alexander Viro , Miklos Szeredi , Andrew Morton , Chaitanya Kulkarni Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, LKML , John Hubbard References: <20220227093434.2889464-1-jhubbard@nvidia.com> <20220227093434.2889464-5-jhubbard@nvidia.com> From: Jens Axboe In-Reply-To: <20220227093434.2889464-5-jhubbard@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5AD7A1C0004 X-Stat-Signature: of6sk31x4qmaocd8ezszkqjbbqgfas4e Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=kernel-dk.20210112.gappssmtp.com header.s=20210112 header.b=AEhyForK; spf=pass (imf18.hostedemail.com: domain of axboe@kernel.dk designates 209.85.210.179 as permitted sender) smtp.mailfrom=axboe@kernel.dk; dmarc=none X-HE-Tag: 1645999179-274740 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: On 2/27/22 2:34 AM, jhubbard.send.patches@gmail.com wrote: > From: John Hubbard > > Use pin_user_pages_fast(), pin_user_page(), and unpin_user_page() calls, > in place of get_user_pages_fast(), get_page() and put_page(). > > This converts the Direct IO parts of most filesystems over to using > FOLL_PIN (pin_user_page*()) page pinning. The commit message needs to explain why a change is being made, not what is being done. The latter I can just look at the code for. Didn't even find it in in your cover letter, had to go to the original posting for that. -- Jens Axboe