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 5F02EC5ACD6 for ; Wed, 18 Mar 2020 18:57:09 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1F1882072C for ; Wed, 18 Mar 2020 18:57:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1F1882072C 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 73EF56B000A; Wed, 18 Mar 2020 14:57:08 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6EFDF6B000D; Wed, 18 Mar 2020 14:57:08 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 605306B0032; Wed, 18 Mar 2020 14:57:08 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0052.hostedemail.com [216.40.44.52]) by kanga.kvack.org (Postfix) with ESMTP id 45C976B000A for ; Wed, 18 Mar 2020 14:57:08 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 097F8824556B for ; Wed, 18 Mar 2020 18:57:08 +0000 (UTC) X-FDA: 76609390536.25.clock55_7872a0c2b3f33 X-HE-Tag: clock55_7872a0c2b3f33 X-Filterd-Recvd-Size: 2164 Received: from gentwo.org (gentwo.org [3.19.106.255]) by imf19.hostedemail.com (Postfix) with ESMTP for ; Wed, 18 Mar 2020 18:57:07 +0000 (UTC) Received: by gentwo.org (Postfix, from userid 1002) id 1FEAA3EF51; Wed, 18 Mar 2020 18:57:07 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 1DA593EF50; Wed, 18 Mar 2020 18:57:07 +0000 (UTC) Date: Wed, 18 Mar 2020 18:57:07 +0000 (UTC) From: Christopher Lameter X-X-Sender: cl@www.lameter.com To: Michal Hocko cc: Srikar Dronamraju , Andrew Morton , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mel Gorman , Vlastimil Babka , "Kirill A. Shutemov" , Linus Torvalds Subject: Re: [PATCH 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline In-Reply-To: <20200316085425.GB11482@dhcp22.suse.cz> Message-ID: References: <20200311110237.5731-1-srikar@linux.vnet.ibm.com> <20200311110237.5731-4-srikar@linux.vnet.ibm.com> <20200316085425.GB11482@dhcp22.suse.cz> 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=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 16 Mar 2020, Michal Hocko wrote: > > We can dynamically number the nodes right? So just make sure that the > > firmware properly creates memory on node 0? > > Are you suggesting that the OS would renumber NUMA nodes coming > from FW just to satisfy node 0 existence? If yes then I believe this is > really a bad idea because it would make HW/LPAR configuration matching > to the resulting memory layout really hard to follow. NUMA nodes are created by the OS based on information provided by the firmware. Either the FW would need to ensure that a viable node 0 exists or the bootstrap arch code could setup things to the same effect.