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(p200300cbc7082200d595cc202e3afc5f.dip0.t-ipconnect.de. [2003:cb:c708:2200:d595:cc20:2e3a:fc5f]) by smtp.gmail.com with ESMTPSA id w12-20020a05600c474c00b003a5f3f5883dsm6298293wmo.17.2022.09.22.07.43.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Sep 2022 07:43:58 -0700 (PDT) Message-ID: Date: Thu, 22 Sep 2022 16:43:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.1 Subject: Re: [PATCH v2 4/7] iov_iter: new iov_iter_pin_pages*() routines To: Christoph Hellwig , Al Viro Cc: Jan Kara , John Hubbard , Andrew Morton , Jens Axboe , Miklos Szeredi , "Darrick J . Wong" , Trond Myklebust , Anna Schumaker , Logan Gunthorpe , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org, LKML References: <103fe662-3dc8-35cb-1a68-dda8af95c518@nvidia.com> <20220906102106.q23ovgyjyrsnbhkp@quack3> <20220914145233.cyeljaku4egeu4x2@quack3> <20220915081625.6a72nza6yq4l5etp@quack3> From: David Hildenbrand Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663857842; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=p2A8ib/cugNV2ErbC2kQ1gu2unsdhUUMjY2O8jgaTH4=; b=tndt4XJ0Z2Xd73F+9XN+QmBnWzammsz62xd6qeHEhiDkLPmucyZacivMiKGFqZUbzEJcbW IvzYEOMgKGOS8EZDvhxhwkzvkGOKzLKgUI4RaNPWEAVlCoW4dqT/GU+1Svwv6RlNVX3Qxz frCD1tfvF9H13wxjx+8LvfoWwAkxTQ8= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=YIGXI5Bo; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf15.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663857842; a=rsa-sha256; cv=none; b=VDEvALQfUvQKXm+O0SA/JyfjRj2f46o/pCeAVVo31vo4uDdoflaOmO+v5A4aE+S28Ng0k/ Kc6nBDiHdoBI/alNE1SGxmqN3/q7yaW6+GlFOQ2Tn7Xjq8lrxU3xl9l7+nOoeywWbKPo+1 ySfvayQjSjWcT0ENg3bLNkDq7M0ZAPQ= X-Rspam-User: X-Stat-Signature: u5qif83ok5ptw69uzum8y6mmp6eb65i7 X-Rspamd-Queue-Id: 4B6BDA0028 Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=YIGXI5Bo; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf15.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com X-Rspamd-Server: rspam08 X-HE-Tag: 1663857842-899383 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 22.09.22 16:36, Christoph Hellwig wrote: > On Tue, Sep 20, 2022 at 06:02:11AM +0100, Al Viro wrote: >> nvme target: nvme read requests end up with somebody allocating and filling >> sglist, followed by reading from file into it (using ITER_BVEC). Then the >> pages are sent out, presumably > > Yes. > >> . I would be very surprised if it turned out >> to be anything other than anon pages allocated by the driver, but I'd like >> to see that confirmed by nvme folks. Probably doesn't need pinning. > > They are anon pages allocated by the driver using sgl_alloc(). I assume they are not anon pages as in "PageAnon()", but simply not pagecache pages, correct? -- Thanks, David / dhildenb