Received: by 10.192.165.148 with SMTP id m20csp475074imm;
        Wed, 9 May 2018 16:32:03 -0700 (PDT)
X-Google-Smtp-Source: AB8JxZqgtQwjS3qEQqHQZtsU+aH4iglV7ivnjxzPo+i1j9AiVR9CtSFM108HbPXnDPOk+fcCJhv9
X-Received: by 2002:a65:4204:: with SMTP id c4-v6mr110363pgq.26.1525908723702;
        Wed, 09 May 2018 16:32:03 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1525908723; cv=none;
        d=google.com; s=arc-20160816;
        b=ZDqowvQRwPYb9e2jVvQjKMzo0AJD0WG5PAqQzPsz/fPDiMNSJpyMIgTZC3D6GSkKet
         qnZCsryC+zUpjwlG4Zl+gibVdz6Wb3i64K5hkCyxKrxNz5hki7dwa8upTOwE9XjUsuJF
         XBuU66eoGdC+apNwubXMSKWVzRYbvuGQuFHwdFnsGqnfyvmok2YqnBvin32qixilT8le
         NU4iQuqf+BaRAMZ4oKvG7EmEOOamfy2pWKXR+WDzMtqiSvSGjirW2kNen/UyqY9knI0n
         RtIWGosaaHrRYZAkMqp29aiJyejhphpAH7QwJz4b1S3LZMyMqSz8jifaZ3NWGrtumQl+
         NfrA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:content-transfer-encoding
         :content-language:in-reply-to:mime-version:user-agent:date
         :message-id:openpgp:from:cc:references:to:subject
         :arc-authentication-results;
        bh=7pp0lA/DdoeXmT7SOow0k9x/PKt10jXHe8bD0sa1S5k=;
        b=L567qtPMDldy/m8jGjJ1hWxlFTgoK6YlVvzr8yKhgNNtmMS48nTk7Xes9PZVzjB8JG
         kH1RrVVc2w1HoYMCieHkXsft1wM4ikwb1isol18C0dxKchwtTqAGgM/ggmH4dXKvhLIs
         IMoocDTuimYoPWhyRSUY3M7fnfrndLhd3JgfTNUKqWjuO65Rq2/CsMtZlYdQLRq7q+go
         jYlghjovOllty0fkkAnPPZk/qy4aD4NaSyBO653OoZ8u4r/RPFGFdCwsF8kfyACP1BwY
         v7G2jvWHZyRYxG3pXu/WUDCayeLaDRxGbqnWIrPxObF57GZWav0OptZLFlfKd0RBWsRZ
         JsPA==
ARC-Authentication-Results: i=1; mx.google.com;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id y73-v6si22417032pgd.390.2018.05.09.16.31.48;
        Wed, 09 May 2018 16:32:03 -0700 (PDT)
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Authentication-Results: mx.google.com;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S966031AbeEIXb0 (ORCPT <rfc822;gklkml16@gmail.com> + 99 others);
        Wed, 9 May 2018 19:31:26 -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 <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 9 May 2018 19:31:24 -0400
X-Amp-Result: SKIPPED(no attachment in message)
X-Amp-File-Uploaded: False
Received: from orsmga003.jf.intel.com ([10.7.209.27])
  by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 May 2018 16:31:22 -0700
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.49,383,1520924400"; 
   d="scan'208";a="49629107"
Received: from cckuo1-mobl2.amr.corp.intel.com (HELO [10.252.137.149]) ([10.252.137.149])
  by orsmga003.jf.intel.com with ESMTP; 09 May 2018 16:31:22 -0700
Subject: Re: [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node information
To:     prakash.sangappa@oracle.com,
        Anshuman Khandual <khandual@linux.vnet.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>
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>
 <c72fea44-59f3-b106-8311-b5eae2d254e7@intel.com>
 <addeaadc-5ab2-f0c9-2194-dd100ae90f3a@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 <nao.horiguchi@gmail.com>
From:   Dave Hansen <dave.hansen@intel.com>
Openpgp: preference=signencrypt
X-Enigmail-Draft-Status: N1110
Message-ID: <aaca3180-7510-c008-3e12-8bbe92344ef4@intel.com>
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: <addeaadc-5ab2-f0c9-2194-dd100ae90f3a@oracle.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 05/07/2018 06:16 PM, prakash.sangappa wrote:
> It will be /proc/<pid>/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/<pid> 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.