linux-kernel - Re: [PATCH v2 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

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Message-ID: <3bfe7469-1d8c-baa4-6d9d-f4786492eaa8@redhat.com>
Date:   Fri, 8 May 2020 15:39:10 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Christopher Lameter <cl@...ux.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 3/3] mm/page_alloc: Keep memoryless cpuless node 0
 offline

On 08.05.20 15:03, Srikar Dronamraju wrote:
> * Michal Hocko <mhocko@...nel.org> [2020-05-04 11:37:12]:
> 
>>>>
>>>> Have you tested on something else than ppc? Each arch does the NUMA
>>>> setup separately and this is a big mess. E.g. x86 marks even memory less
>>>> nodes (see init_memory_less_node) as online.
>>>>
>>>
>>> while I have predominantly tested on ppc, I did test on X86 with CONFIG_NUMA
>>> enabled/disabled on both single node and multi node machines.
>>> However, I dont have a cpuless/memoryless x86 system.
>>
>> This should be able to emulate inside kvm, I believe.
>>
> 
> I did try but somehow not able to get cpuless / memoryless node in a x86 kvm
> guest.

I use the following

#! /bin/bash
sudo x86_64-softmmu/qemu-system-x86_64 \
    --enable-kvm \
    -m 4G,maxmem=20G,slots=2 \
    -smp sockets=2,cores=2 \
    -numa node,nodeid=0,cpus=0-1,mem=4G -numa node,nodeid=1,cpus=2-3,mem=0G \
    -kernel /home/dhildenb/git/linux/arch/x86_64/boot/bzImage \
    -append "console=ttyS0 rd.shell rd.luks=0 rd.lvm=0 rd.md=0 rd.dm=0" \
    -initrd /boot/initramfs-5.2.8-200.fc30.x86_64.img \
    -machine pc,nvdimm \
    -nographic \
    -nodefaults \
    -chardev stdio,id=serial \
    -device isa-serial,chardev=serial \
    -chardev socket,id=monitor,path=/var/tmp/monitor,server,nowait \
    -mon chardev=monitor,mode=readline

to get a cpu-less and memory-less node 1. Never tried with node 0.

-- 
Thanks,

David / dhildenb