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=-5.3 required=3.0 tests=BAYES_00, 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 1BBE6C4743D for ; Fri, 11 Jun 2021 08:10:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ECEAA613BA for ; Fri, 11 Jun 2021 08:10:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230377AbhFKIMy (ORCPT ); Fri, 11 Jun 2021 04:12:54 -0400 Received: from outbound-smtp29.blacknight.com ([81.17.249.32]:43559 "EHLO outbound-smtp29.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229480AbhFKIMw (ORCPT ); Fri, 11 Jun 2021 04:12:52 -0400 Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp29.blacknight.com (Postfix) with ESMTPS id E11B618E016 for ; Fri, 11 Jun 2021 09:10:53 +0100 (IST) Received: (qmail 5519 invoked from network); 11 Jun 2021 08:10:53 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[84.203.17.255]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 11 Jun 2021 08:10:53 -0000 Date: Fri, 11 Jun 2021 09:10:52 +0100 From: Mel Gorman To: Zi Yan Cc: Andrew Morton , Dave Hansen , Vlastimil Babka , Michal Hocko , Jesper Dangaard Brouer , LKML , Linux-MM Subject: Re: [PATCH 2/2] mm/page_alloc: Allow high-order pages to be stored on the per-cpu lists Message-ID: <20210611081052.GZ30378@techsingularity.net> References: <20210603142220.10851-1-mgorman@techsingularity.net> <20210603142220.10851-3-mgorman@techsingularity.net> <88FCC7AA-FAAA-4B87-B382-50BD54B2886B@nvidia.com> <20210610111821.GY30378@techsingularity.net> <3B44DF44-5669-40B6-A122-011F1A749FAA@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <3B44DF44-5669-40B6-A122-011F1A749FAA@nvidia.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 10, 2021 at 07:40:47AM -0400, Zi Yan wrote: > >> My kernel config is attached and my qemu command is: > >> > >> qemu-system-x86_64 -kernel ~/repos/linux-1gb-thp/arch/x86/boot/bzImage \ > >> -drive file=~/qemu-image/vm.qcow2,if=virtio \ > >> -append "nokaslr root=/dev/vda1 rw console=ttyS0 " \ > >> -pidfile vm.pid \ > >> -netdev user,id=mynet0,hostfwd=tcp::11022-:22 \ > >> -device virtio-net-pci,netdev=mynet0 \ > >> -m 16g -smp 6 -cpu host -enable-kvm -nographic \ > >> -machine hmat=on -object memory-backend-ram,size=8g,id=m0 \ > >> -object memory-backend-ram,size=8g,id=m1 \ > >> -numa node,memdev=m0,nodeid=0 -numa node,memdev=m1,nodeid=1 > >> > >> The attached config has THP disabled. The VM cannot boot with THP enabled, > >> either. > >> > > > > There is not a lot of information to go on here. Can you confirm that a > > revert of that specific patch from mmotm-2021-06-07-18-33 also boots? It > > sounds like your console log is empty, does anything useful appear if > > you add "earlyprintk=serial,ttyS0,115200" to the kernel command line? > > Sure. I can confirm that reverting the patch makes the VM boot. > The important information I forgot to mention is that after I remove > the NUMA setting in the QEMU, the VM can boot too. > > earlyprintk gave the error message (page out of zone boundary) when the VM could not boot: > Ok, thanks, that helps. For a page to be out of boundary, I either have completely screwed the zone handling for PCP or, more likely, pages are leaking onto the boot pagesets because of the batch count handling. It's weird I did not see this on NUMA machines but nevertheless, I'll go find it. It should not take long. -- Mel Gorman SUSE Labs