Received: by 2002:a25:7ec1:0:0:0:0:0 with SMTP id z184csp460882ybc; Fri, 22 Nov 2019 07:55:57 -0800 (PST) X-Google-Smtp-Source: APXvYqz21AD/bfN7PYGdxlUv7G28IlIpR+OahN1fLSCWqS5IKD6skkPECIv0EQwiHgJtc2CKZ/1+ X-Received: by 2002:a17:906:da1d:: with SMTP id fi29mr23312199ejb.26.1574438157100; Fri, 22 Nov 2019 07:55:57 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1574438157; cv=none; d=google.com; s=arc-20160816; b=a+lKUcaIaOL47MDawOs3DhbmbixYfYbN4TKTuKeC/3mZqA+iX13Ha9vURZYdWMDjIP et4MoT9/eIStS6+CvnXqdyoW0VWJKCme6TbIFTLTDrXAqL0B30qxgnWR1LsHtlaJfMy0 OSBSJ6a76RhsJFdlgQhf5CzZIPQHZcp7xZGD4VGglvv72QgwJHLHfIHbbcYLKayL2w22 PPU6yOv2zuLwe2cNM0fG0zPs63EcLFz1ytE+rCO+bLEVEpQsIE28z+l/YLvWHJG6bEQH Q60LPdZHHVhaR2267TbdtakxwD4jSjkFhqxlHhTPdGHXvXkSaI804xkpYuJJf9EDKxGt 0SDQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date; bh=jrFAcUTsCCDgPUzb32FW8pUH+HvGfG5QviyLec3gieI=; b=dVIDOzONMpDjFOnusFRHeGGhkA5l+q8UlMsQ65KKFA6WpdX/TaxwuT2QBmo2CRXcY3 Oamt+hMJ3zQP/w3I4/Oomypyg9jU7/ehdLheKw4MIP3kXxHjuGbN5b/ptLGMKF50pQcO FjyVOu5I6+hDiH1K1afHXr78mSReIlXzL62uQoI4nOu4reuCkqWe7m6s8hbxqN2Dor+5 sy7WTgd9NqeBaAtiZ1NSat/LCdrRxVNudJm1RQvKlSHbxeaoXRP5KhhAkzFNl7Alqh3h aZJNJhoYWJvaLpmX3sXhLCeYvfkmAUV4XjKiMgsLDDTmbmKAzgDOkHZsiu8ZknQ9fHPy wY7Q== 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: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id o2si5496864edj.290.2019.11.22.07.55.32; Fri, 22 Nov 2019 07:55:57 -0800 (PST) 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 S1726792AbfKVPx6 (ORCPT + 99 others); Fri, 22 Nov 2019 10:53:58 -0500 Received: from gentwo.org ([3.19.106.255]:39220 "EHLO gentwo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726546AbfKVPx6 (ORCPT ); Fri, 22 Nov 2019 10:53:58 -0500 Received: by gentwo.org (Postfix, from userid 1002) id 5EDB93F3D6; Fri, 22 Nov 2019 15:53:57 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 5DE683EBFD; Fri, 22 Nov 2019 15:53:57 +0000 (UTC) Date: Fri, 22 Nov 2019 15:53:57 +0000 (UTC) From: Christopher Lameter X-X-Sender: cl@www.lameter.com To: Pengfei Li cc: David Hildenbrand , akpm@linux-foundation.org, mgorman@techsingularity.net, mhocko@kernel.org, vbabka@suse.cz, iamjoonsoo.kim@lge.com, guro@fb.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC v1 00/19] Modify zonelist to nodelist v1 In-Reply-To: <20191122234907.4da3bc81.fly@kernel.page> Message-ID: References: <20191121151811.49742-1-fly@kernel.page> <1bb37491-72a7-feaa-722d-a5825813a409@redhat.com> <20191122234907.4da3bc81.fly@kernel.page> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 22 Nov 2019, Pengfei Li wrote: > I am sorry that I did not make it clear. I want to express this series > of patches will benefit NUMA systems with multiple nodes. Ok but that benefit needs to be quantified somehow. > The main benefit is that it will be more efficient when traversing all > nodes (for example when performing page reclamation). And you loose the prioritization of allocations through these different zones. We create zonelists with a certain sequence of the zones in order to prefer allocations from certain zones. This is in particular important for the smaller DMA zones which may be easily exhausted.