From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C640C282CE for ; Fri, 5 Apr 2019 22:03:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 53B8C20989 for ; Fri, 5 Apr 2019 22:03:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726496AbfDEWDE (ORCPT ); Fri, 5 Apr 2019 18:03:04 -0400 Received: from outbound.smtp.vt.edu ([198.82.183.121]:48948 "EHLO omr2.cc.vt.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726124AbfDEWDD (ORCPT ); Fri, 5 Apr 2019 18:03:03 -0400 Received: from mr1.cc.vt.edu (mr1.cc.ipv6.vt.edu [IPv6:2607:b400:92:8300:0:31:1732:8aa4]) by omr2.cc.vt.edu (8.14.4/8.14.4) with ESMTP id x35LRkEN006317 for ; Fri, 5 Apr 2019 17:27:46 -0400 Received: from mail-qk1-f198.google.com (mail-qk1-f198.google.com [209.85.222.198]) by mr1.cc.vt.edu (8.14.7/8.14.7) with ESMTP id x35LRe2T010393 for ; Fri, 5 Apr 2019 17:27:45 -0400 Received: by mail-qk1-f198.google.com with SMTP id f196so6154328qke.4 for ; Fri, 05 Apr 2019 14:27:45 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:in-reply-to:references :mime-version:date:message-id; bh=Y79cdCdF/M5lgfA1xcm93DhUSoi2n3NbM7Cae4JkvcY=; b=YiyL9E+xrrMSUunzwq4zZ9lU3NEZIgxJyxjDXSF/frKKTONBJwFWrgV4GckOsdoP4R KLxgnIipYh2BjGtHGiImXVzR2KRXLL/J7XQfCv15TxeDGpz5CwURdLji8pEudJBLC+no CA+Dh0PFXSFzuu0UEGakwjbhP4BLYhAtGfkxda6liaG1Ky6AMRYIqk8LTd3CXz/c5Ueo x7xCWKW7xeaZZvZvzWhNvRoyZgCoHAZEXBYt/0EYLCcUiuEbrx2vLcj3lnTrTDlpK/iV GGbRfuDH4LERXZuqzB0sTKIKu4hoj1R7POCWmY69vj2hThpPMHrz9OvCYS1gcmhx6IpG guAg== X-Gm-Message-State: APjAAAXoavwUpV4PFj1D2XNYPPLOD8UnMKppnwPlv9g430GGUXrraRYY XKz2MF/mFE7h+yew4zQbJBFAIx/vHVDUopNjyr5+CboEpQLkkpTB4v5/tEpOZ80D9ZqJcJGB8eO d7h/XgqY60yRZ0NhCOYRUf8RmfweZ+L0wfS8= X-Received: by 2002:a0c:d092:: with SMTP id z18mr11840008qvg.14.1554499660608; Fri, 05 Apr 2019 14:27:40 -0700 (PDT) X-Google-Smtp-Source: APXvYqxNuR6TLAZ7r/bEEXsC7ygCFH1VT8BXKCBf0qPFgAa9qRwr3vE1qxeJ67tezCv9L036/cZsYg== 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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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?)