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[2607:b400:92:8300:0:c6:2117:b0e]) by mx.google.com with ESMTPS id z31si661757qtz.218.2019.04.05.14.27.46 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 Apr 2019 14:27:46 -0700 (PDT) Received-SPF: pass (google.com: domain of valdis@vt.edu designates 2607:b400:92:8300:0:c6:2117:b0e as permitted sender) client-ip=2607:b400:92:8300:0:c6:2117:b0e; Authentication-Results: mx.google.com; spf=pass (google.com: domain of valdis@vt.edu designates 2607:b400:92:8300:0:c6:2117:b0e as permitted sender) smtp.mailfrom=valdis@vt.edu; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=vt.edu Received: from mr5.cc.vt.edu (mr5.cc.ipv6.vt.edu [IPv6:2607:b400:92:8400:0:72:232:758b]) by omr1.cc.vt.edu (8.14.4/8.14.4) with ESMTP id x35LRjti017652 for ; Fri, 5 Apr 2019 17:27:45 -0400 Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by mr5.cc.vt.edu (8.14.7/8.14.7) with ESMTP id x35LReDI009007 for ; Fri, 5 Apr 2019 17:27:45 -0400 Received: by mail-qt1-f197.google.com with SMTP id q12so6624521qtr.3 for ; Fri, 05 Apr 2019 14:27:45 -0700 (PDT) X-Received: by 2002:a0c:d092:: with SMTP id z18mr11840005qvg.14.1554499660598; Fri, 05 Apr 2019 14:27:40 -0700 (PDT) X-Received: by 2002:a0c:d092:: with SMTP id z18mr11839994qvg.14.1554499660359; Fri, 05 Apr 2019 14:27:40 -0700 (PDT) Received: from turing-police ([2601:5c0:c001:4341::9ca]) by smtp.gmail.com with ESMTPSA id p62sm6308944qkd.27.2019.04.05.14.27.38 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 05 Apr 2019 14:27:38 -0700 (PDT) From: "Valdis Kl=?utf-8?Q?=c4=93?=tnieks" X-Google-Original-From: "Valdis Kl=?utf-8?Q?=c4=93?=tnieks" X-Mailer: exmh version 2.9.0 11/07/2018 with nmh-1.7+dev To: Pankaj Suryawanshi cc: LKML , "linux-mm@kvack.org" , "kernelnewbies@kernelnewbies.org" Subject: Re: How to calculate page address to PFN in user space. In-reply-to: <1536252828.16026118.1554461687939@mail.yahoo.com> References: <1536252828.16026118.1554461687939.ref@mail.yahoo.com> <1536252828.16026118.1554461687939@mail.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 05 Apr 2019 17:27:37 -0400 Message-ID: <6977.1554499657@turing-police> X-Bogosity: Ham, tests=bogofilter, spamicity=0.052605, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 05 Apr 2019 10:54:47 -0000, Pankaj Suryawanshi said: > I have PFN of all processes in user space, how to calculate page address to PFN. *All* user processes? That's going to be a lot of PFN's. What problem are you trying to solve here? (Hint - under what cases does the kernel care about the PFN of *any* user page?)