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Thu, 3 May 2018 18:26:55 -0400 Received: from mga04.intel.com ([192.55.52.120]:21544 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750829AbeECW0y (ORCPT ); Thu, 3 May 2018 18:26:54 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,360,1520924400"; d="scan'208";a="53017137" Subject: Re: [RFC PATCH] Add /proc//numa_vamaps for numa node information To: prakash.sangappa@oracle.com, Anshuman Khandual , Andrew Morton References: <1525240686-13335-1-git-send-email-prakash.sangappa@oracle.com> <20180502143323.1c723ccb509c3497050a2e0a@linux-foundation.org> <2ce01d91-5fba-b1b7-2956-c8cc1853536d@intel.com> <33f96879-351f-674a-ca23-43f233f4eb1d@linux.vnet.ibm.com> <82d2b35c-272a-ad02-692f-2c109aacdfb6@oracle.com> Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, mhocko@suse.com, kirill.shutemov@linux.intel.com, n-horiguchi@ah.jp.nec.com, drepper@gmail.com, rientjes@google.com, Naoya Horiguchi From: Dave Hansen Openpgp: preference=signencrypt Message-ID: <8569dabb-4930-aa20-6249-72457e2df51e@intel.com> Date: Thu, 3 May 2018 15:26:53 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <82d2b35c-272a-ad02-692f-2c109aacdfb6@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 05/03/2018 03:27 PM, prakash.sangappa wrote: >> > If each consecutive page comes from different node, yes in > the extreme case is this file will have a lot of lines. All the lines > are generated at the time file is read. The amount of data read will be > limited to the user read buffer size used in the read. > > /proc//pagemap also has kind of similar issue. There is 1 64 > bit value for each user page. But nobody reads it sequentially. Everybody lseek()s because it has a fixed block size. You can't do that in text.