linux-kernel - Re: [RFC v1 00/19] Modify zonelist to nodelist v1

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Date:   Fri, 22 Nov 2019 23:05:43 +0800
From:   Pengfei Li <fly@...nel.page>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        vbabka@...e.cz, cl@...ux.com, iamjoonsoo.kim@....com, guro@...com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC v1 00/19] Modify zonelist to nodelist v1

On Thu, 21 Nov 2019 19:04:01 +0100
Michal Hocko <mhocko@...nel.org> wrote:

> On Thu 21-11-19 23:17:52, Pengfei Li wrote:
> [...]
> > Since I don't currently have multiple node NUMA systems, I would be
> > grateful if anyone would like to test this series of patches.
> 
> I didn't really get to think about the actual patchset. From a very
> quick glance I am wondering whether we need to optimize as there are
> usually only small amount of numa nodes. But I am quite busy so I
> cannot really do any claims.

Thanks for your comments.

I think it's time to modify the zonelist to nodelist because the
zonelist is always in node order and the page reclamation is based on
node.

I will do more performance testing to show that multi-node systems will
benefit from this series of patches.

> Anyway, you can test this even without NUMA HW. Have a look at
> numa=fake option (numa_emu_cmdline). Or you can use kvm/qemu which
> provides easy ways to setup a NUMA capable virtual machine.

Thanks a lot. I will use the numa=fake option to do more performance
testing.