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=-8.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 8B9A8C43460 for ; Thu, 8 Apr 2021 08:53:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F1F561131 for ; Thu, 8 Apr 2021 08:53:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230374AbhDHIxy (ORCPT ); Thu, 8 Apr 2021 04:53:54 -0400 Received: from mx2.suse.de ([195.135.220.15]:53884 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230337AbhDHIxx (ORCPT ); Thu, 8 Apr 2021 04:53:53 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4B807AF0C; Thu, 8 Apr 2021 08:53:41 +0000 (UTC) Date: Thu, 8 Apr 2021 10:03:15 +0200 From: Oscar Salvador To: Dave Hansen Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, shy828301@gmail.com, weixugc@google.com, rientjes@google.com, ying.huang@intel.com, dan.j.williams@intel.com, david@redhat.com Subject: Re: [PATCH 01/10] mm/numa: node demotion data structure and lookup Message-ID: References: <20210401183216.443C4443@viggo.jf.intel.com> <20210401183218.E7C9CE24@viggo.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210401183218.E7C9CE24@viggo.jf.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 01, 2021 at 11:32:18AM -0700, Dave Hansen wrote: > > From: Dave Hansen > > Prepare for the kernel to auto-migrate pages to other memory nodes > with a user defined node migration table. This allows creating single > migration target for each NUMA node to enable the kernel to do NUMA > page migrations instead of simply reclaiming colder pages. A node > with no target is a "terminal node", so reclaim acts normally there. > The migration target does not fundamentally _need_ to be a single node, > but this implementation starts there to limit complexity. > > If you consider the migration path as a graph, cycles (loops) in the > graph are disallowed. This avoids wasting resources by constantly > migrating (A->B, B->A, A->B ...). The expectation is that cycles will > never be allowed. > > Signed-off-by: Dave Hansen > Reviewed-by: Yang Shi > Cc: Wei Xu > Cc: David Rientjes > Cc: Huang Ying > Cc: Dan Williams > Cc: David Hildenbrand > Cc: osalvador I think this patch and patch#2 could be squashed Reviewed-by: Oscar Salvador -- Oscar Salvador SUSE L3