From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 930EDC432C0 for ; Fri, 22 Nov 2019 15:53:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6AFA62071B for ; Fri, 22 Nov 2019 15:53:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6AFA62071B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 219C56B0512; Fri, 22 Nov 2019 10:53:59 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1F3916B0513; Fri, 22 Nov 2019 10:53:59 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 12F8C6B0514; Fri, 22 Nov 2019 10:53:59 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0231.hostedemail.com [216.40.44.231]) by kanga.kvack.org (Postfix) with ESMTP id F1C996B0512 for ; Fri, 22 Nov 2019 10:53:58 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id BB3115DE9 for ; Fri, 22 Nov 2019 15:53:58 +0000 (UTC) X-FDA: 76184359356.15.sack99_599d0f3e123d X-HE-Tag: sack99_599d0f3e123d X-Filterd-Recvd-Size: 1899 Received: from gentwo.org (gentwo.org [3.19.106.255]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Fri, 22 Nov 2019 15:53:58 +0000 (UTC) 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000147, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.