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

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Message-ID: <20191125084058.GD31714@dhcp22.suse.cz>
Date:   Mon, 25 Nov 2019 09:40:58 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Pengfei Li <fly@...nel.page>
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 Fri 22-11-19 23:05:43, Pengfei Li wrote:
> 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.

Sensible performance numbers on multiple workloads (ideally some real
world ones rather than artificial microbenchmarks) is essential for a
performance optimization that is this large.
-- 
Michal Hocko
SUSE Labs