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

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Message-ID: <alpine.DEB.2.21.1911221551570.10063@www.lameter.com>
Date:   Fri, 22 Nov 2019 15:53:57 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Pengfei Li <fly@...nel.page>
cc:     David Hildenbrand <david@...hat.com>, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, mhocko@...nel.org, vbabka@...e.cz,
        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 Fri, 22 Nov 2019, Pengfei Li wrote:

> I am sorry that I did not make it clear. I want to express this series
> of patches will benefit NUMA systems with multiple nodes.

Ok but that benefit needs to be quantified somehow.

> The main benefit is that it will be more efficient when traversing all
> nodes (for example when performing page reclamation).

And you loose the prioritization of allocations through these different
zones. We create zonelists with a certain sequence of the zones in
order to prefer allocations from certain zones. This is in particular
important for the smaller DMA zones which may be easily exhausted.