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 13938C433FE for ; Thu, 13 Jan 2022 15:31:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 79F536B0072; Thu, 13 Jan 2022 10:31:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 74F3B6B0073; Thu, 13 Jan 2022 10:31:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 63E496B0074; Thu, 13 Jan 2022 10:31:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0109.hostedemail.com [216.40.44.109]) by kanga.kvack.org (Postfix) with ESMTP id 507F86B0072 for ; Thu, 13 Jan 2022 10:31:25 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 0CA6A95CAD for ; Thu, 13 Jan 2022 15:31:25 +0000 (UTC) X-FDA: 79025652930.07.C86E321 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by imf19.hostedemail.com (Postfix) with ESMTP id DBF761A0006 for ; Thu, 13 Jan 2022 15:31:23 +0000 (UTC) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 7E36821129; Thu, 13 Jan 2022 15:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1642087881; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=zIXhxVVHGtk6ijZKhabiqkui6YCqOppbvprKjXD8XzM=; b=AaV+zMcbVcgg/XXoOO/p32goghWxiXPv2dtWCsrhkJwWM7gjx6zEoTun9YsoHH5c8BgNhV eTK3KKj9TrteV9EI25Oknd1kGmIeDMlpHOElE3BTeymNQznitD/rpkPj1ud/jBkAzBEJJJ L6zN42xHy+SegMUyC0zVT8kJjIi1QXQ= Received: from suse.cz (unknown [10.100.201.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay2.suse.de (Postfix) with ESMTPS id 71C80A3B89; Thu, 13 Jan 2022 15:31:20 +0000 (UTC) Date: Thu, 13 Jan 2022 16:31:16 +0100 From: Michal Hocko To: sxwjean@me.com Cc: akpm@linux-foundation.org, david@redhat.com, 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@vger.kernel.org, Xiongwei Song Subject: Re: [PATCH v3 2/2] proc: Add getting pages info of ZONE_DEVICE support Message-ID: References: <20220112143517.262143-1-sxwjean@me.com> <20220112143517.262143-3-sxwjean@me.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220112143517.262143-3-sxwjean@me.com> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: DBF761A0006 X-Stat-Signature: nichy9us5epfybquk91igom5a4qyg515 Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=suse.com header.s=susede1 header.b=AaV+zMcb; spf=pass (imf19.hostedemail.com: domain of mhocko@suse.com designates 195.135.220.28 as permitted sender) smtp.mailfrom=mhocko@suse.com; dmarc=pass (policy=quarantine) header.from=suse.com X-HE-Tag: 1642087883-768251 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 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? -- Michal Hocko SUSE Labs