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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 0EFCBC432C0 for ; Fri, 22 Nov 2019 15:06:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8EA620706 for ; Fri, 22 Nov 2019 15:06:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726719AbfKVPGT (ORCPT ); Fri, 22 Nov 2019 10:06:19 -0500 Received: from relay2-d.mail.gandi.net ([217.70.183.194]:50603 "EHLO relay2-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726100AbfKVPGT (ORCPT ); Fri, 22 Nov 2019 10:06:19 -0500 X-Originating-IP: 153.3.140.100 Received: from localhost (unknown [153.3.140.100]) (Authenticated sender: fly@kernel.page) by relay2-d.mail.gandi.net (Postfix) with ESMTPSA id C0A674001B; Fri, 22 Nov 2019 15:06:01 +0000 (UTC) Date: Fri, 22 Nov 2019 23:05:43 +0800 From: Pengfei Li To: Michal Hocko Cc: akpm@linux-foundation.org, mgorman@techsingularity.net, vbabka@suse.cz, cl@linux.com, 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 Message-ID: <20191122230543.2f106c80.fly@kernel.page> In-Reply-To: <20191121180401.GL23213@dhcp22.suse.cz> References: <20191121151811.49742-1-fly@kernel.page> <20191121180401.GL23213@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 21 Nov 2019 19:04:01 +0100 Michal Hocko wrote: > On Thu 21-11-19 23:17:52, Pengfei Li wrote: > [...] > > Since I don't currently have multiple node NUMA systems, I would be > > grateful if anyone would like to test this series of patches. > > I didn't really get to think about the actual patchset. From a very > quick glance I am wondering whether we need to optimize as there are > usually only small amount of numa nodes. But I am quite busy so I > cannot really do any claims. Thanks for your comments. I think it's time to modify the zonelist to nodelist because the zonelist is always in node order and the page reclamation is based on node. I will do more performance testing to show that multi-node systems will benefit from this series of patches. > Anyway, you can test this even without NUMA HW. Have a look at > numa=fake option (numa_emu_cmdline). Or you can use kvm/qemu which > provides easy ways to setup a NUMA capable virtual machine. Thanks a lot. I will use the numa=fake option to do more performance testing.