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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1BA24C433EF for ; Fri, 14 Jan 2022 10:03:35 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 971CF6B0072; Fri, 14 Jan 2022 05:03:34 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9218F6B0073; Fri, 14 Jan 2022 05:03:34 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7E8936B0074; Fri, 14 Jan 2022 05:03:34 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay032.a.hostedemail.com [64.99.140.32]) by kanga.kvack.org (Postfix) with ESMTP id 6EDEE6B0072 for ; Fri, 14 Jan 2022 05:03:34 -0500 (EST) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay12.hostedemail.com (Postfix) with ESMTP id 00DE712174E for ; Fri, 14 Jan 2022 10:03:33 +0000 (UTC) X-FDA: 79028455548.02.EF7F52A Received: from mail-pl1-f179.google.com (mail-pl1-f179.google.com [209.85.214.179]) by imf07.hostedemail.com (Postfix) with ESMTP id D2A6640010 for ; Fri, 14 Jan 2022 10:03:32 +0000 (UTC) Received: by mail-pl1-f179.google.com with SMTP id f13so2594633plg.0 for ; Fri, 14 Jan 2022 02:03:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=s6C6u8TBdc9M8p01GH9e4dr/uBTHy41NUIFTVoZys3s=; b=AWImLrAs920lXTMlJh1le5mebyLF8myq0jAjgSxB7poe4xKclRAZnV1wwiTAeZwg7l gOPwBezlQW1DrpOhR5tO7z9GP0NIS5iXqYs468SWoedP4tvmCToTiQQXLIgyawCNGCKB /1vn7uFHOypitUcOUQ4yD5fy1p1BJ+DByEOkkIXWRFP1MEDXI9kaocPtp3/kffXoHH7a /debY7bmd5TweIrldcsgcMKd61jpC2tBAUl9Pjgg7eVO/9kxdYRoN+N98SMYGDmCUZtJ LMRGyqfY31Lt7VTuWxSrm9i0yJ1SGHPcfWPnd0SKggOrbM8k+36j4ofYabvUv+plAoa6 5Y8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=s6C6u8TBdc9M8p01GH9e4dr/uBTHy41NUIFTVoZys3s=; b=PT9rSgM9L6agvWKEsVY2mE1gVNzPTpPScRPT5VSmsXv8VU2BP6XQlEwWzh9aF591b5 BKK1Nug2fiOg7364USMe1lTtswCniVuPjJSyQ7fzyTbUQdnAP/HKfwmVO1WZ4Gtcc/oQ v9pGiXtGg3Q8nuXjPK+UDRlk0+LPSyFjRCqNfL0fYJTyCLmqB5/+HdX1syY9wAkE9ZD1 4zzZDDOQm042Q0Ync4q1Nt2zcvkYHFcn5qSOM+KONLMmrAfheGSlOjx0TtMIZkwjNx5U M6C/Bt2tunUjd8ZHRQpKj8oYn+ZnrfjmtPasAzSGX1d04JLHMO7/I0AInLFzTfzGafrB KVSg== X-Gm-Message-State: AOAM532gC91uw4i+j+aRT8lpglbQ3e631GwCb2OPTh57nQAz9Dg7X8kA Y/7fGjAfGP3R33ijyrvb0DhwDdpE5FgO4+a6+Mw= X-Google-Smtp-Source: ABdhPJzFXa1+5zcRjtQjdRUQ9nz12FaliOO8vqTVftxdvQWzLH3ulk1/Iqq/aVM9G7JxKxcAYpWnfmMhIj8CRQKjUSY= X-Received: by 2002:a17:90a:a588:: with SMTP id b8mr19504354pjq.25.1642154611189; Fri, 14 Jan 2022 02:03:31 -0800 (PST) MIME-Version: 1.0 References: <20220112143517.262143-1-sxwjean@me.com> <20220112143517.262143-3-sxwjean@me.com> In-Reply-To: From: Xiongwei Song Date: Fri, 14 Jan 2022 18:03:04 +0800 Message-ID: Subject: Re: [PATCH v3 2/2] proc: Add getting pages info of ZONE_DEVICE support To: Michal Hocko Cc: Xiongwei Song , akpm@linux-foundation.org, David Hildenbrand , dan.j.williams@intel.com, osalvador@suse.de, naoya.horiguchi@nec.com, thunder.leizhen@huawei.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: D2A6640010 X-Stat-Signature: t17c71m53a3rd3xrpyu393k67ihe4g95 Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=AWImLrAs; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf07.hostedemail.com: domain of sxwjean@gmail.com designates 209.85.214.179 as permitted sender) smtp.mailfrom=sxwjean@gmail.com X-Rspamd-Server: rspam03 X-HE-Tag: 1642154612-212227 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: HI Michal, On Thu, Jan 13, 2022 at 11:31 PM Michal Hocko wrote: > > On Wed 12-01-22 22:35:17, sxwjean@me.com wrote: > > From: Xiongwei Song > > > > When requesting pages info by /proc/kpage*, the pages in ZONE_DEVICE were > > ignored. > > > > The pfn_to_devmap_page() function can help to get page that belongs to > > ZONE_DEVICE. > > Why is this needed? Who would consume that information and what for? It's for debug purpose, which checks page flags in system wide. No any other special thought. But it looks like it's not appropriate to expose now from my understand, which is from David's comment. https://lore.kernel.org/linux-mm/20220110141957.259022-1-sxwjean@me.com/T/#m4eccbb2698dbebc80ec00be47382b34b0f64b4fc Regards, Xingwei