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Mon, 7 May 2018 20:05:45 -0400 Received: from mga06.intel.com ([134.134.136.31]:36957 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752848AbeEHAFp (ORCPT ); Mon, 7 May 2018 20:05:45 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,376,1520924400"; d="scan'208";a="40003022" 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 Message-ID: Date: Mon, 7 May 2018 17:05:44 -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: <51145ccb-fc0d-0281-9757-fb8a5112ec24@oracle.com> 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 04:22 PM, prakash.sangappa wrote: > However, with the proposed new file, we could allow seeking to > specified virtual address. The lseek offset in this case would > represent the virtual address of the process. Subsequent read from > the file would provide VA range to numa node information starting > from that VA. In case the VA seek'ed to is invalid, it will start > from the next valid mapped VA of the process. The implementation > would not be based on seq_file. So you're proposing a new /proc/ file that appears next to and is named very similarly to the exiting /proc/, but which has entirely different behavior?