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Wed, 9 May 2018 19:31:25 -0400 Received: from mga06.intel.com ([134.134.136.31]:24195 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965408AbeEIXbY (ORCPT ); Wed, 9 May 2018 19:31:24 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,383,1520924400"; d="scan'208";a="49629107" 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> <8569dabb-4930-aa20-6249-72457e2df51e@intel.com> <51145ccb-fc0d-0281-9757-fb8a5112ec24@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 X-Enigmail-Draft-Status: N1110 Message-ID: Date: Wed, 9 May 2018 16:31:22 -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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit 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 05/07/2018 06:16 PM, prakash.sangappa wrote: > It will be /proc//numa_vamaps. Yes, the behavior will be > different with respect to seeking. Output will still be text and > the format will be same. > > I want to get feedback on this approach. I think it would be really great if you can write down a list of the things you actually want to accomplish. Dare I say: you need a requirements list. The numa_vamaps approach continues down the path of an ever-growing list of highly-specialized /proc/ files. I don't think that is sustainable, even if it has been our trajectory for many years. Pagemap wasn't exactly a shining example of us getting new ABIs right, but it sounds like something along those is what we need.