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=-2.5 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 D625EC433DF for ; Wed, 1 Jul 2020 18:23:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A7EB42082F for ; Wed, 1 Jul 2020 18:23:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A7EB42082F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 40CD48D005A; Wed, 1 Jul 2020 14:23:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 396C68D0016; Wed, 1 Jul 2020 14:23:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 237358D005A; Wed, 1 Jul 2020 14:23:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0141.hostedemail.com [216.40.44.141]) by kanga.kvack.org (Postfix) with ESMTP id 09C5E8D0016 for ; Wed, 1 Jul 2020 14:23:06 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 8FD422DFA for ; Wed, 1 Jul 2020 18:23:05 +0000 (UTC) X-FDA: 76990328730.03.pen80_13184d226e82 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id 59C4528A4E8 for ; Wed, 1 Jul 2020 18:23:05 +0000 (UTC) X-HE-Tag: pen80_13184d226e82 X-Filterd-Recvd-Size: 5855 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Wed, 1 Jul 2020 18:23:04 +0000 (UTC) IronPort-SDR: 2+GSTCMSVmnTPpLyHo8oiQEZZXdYt330beYtB3OagjSqXykcRBlX4cTwQoZVhfwiyPa6t9ftpx NzZ13SBpWxAw== X-IronPort-AV: E=McAfee;i="6000,8403,9669"; a="144841561" X-IronPort-AV: E=Sophos;i="5.75,301,1589266800"; d="scan'208";a="144841561" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2020 11:23:02 -0700 IronPort-SDR: +IYHCWu/QmdNjvHJWRI0VhRC/n76llLRRU/tEnkAKjbNLHqIL4YStmIxC4MuIyi63mjSLguSYy /AwZe44gazVg== X-IronPort-AV: E=Sophos;i="5.75,301,1589266800"; d="scan'208";a="455201973" Received: from rapyeatx-mobl3.amr.corp.intel.com (HELO [10.255.2.31]) ([10.255.2.31]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2020 11:23:01 -0700 Subject: Re: [RFC][PATCH 5/8] mm/numa: automatically generate node migration order To: "Huang, Ying" , Dave Hansen Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, yang.shi@linux.alibaba.com, rientjes@google.com, dan.j.williams@intel.com References: <20200629234503.749E5340@viggo.jf.intel.com> <20200629234512.F34EDC44@viggo.jf.intel.com> <87ftadotd5.fsf@yhuang-dev.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <87ftadotd5.fsf@yhuang-dev.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US X-Rspamd-Queue-Id: 59C4528A4E8 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 Content-Transfer-Encoding: quoted-printable 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 6/30/20 1:22 AM, Huang, Ying wrote: >> + /* >> + * To avoid cycles in the migration "graph", ensure >> + * that migration sources are not future targets by >> + * setting them in 'used_targets'. >> + * >> + * But, do this only once per pass so that multiple >> + * source nodes can share a target node. > establish_migrate_target() calls find_next_best_node(), which will set > target_node in used_targets. So it seems that the nodes_or() below is > only necessary to initialize used_targets, and multiple source nodes > cannot share one target node in current implementation. Yes, that is true. My focus on this implementation was simplicity and sanity for common configurations. I can certainly imagine scenarios where this is suboptimal. I'm totally open to other ways of doing this.