linux-kernel - Re: [LKP] [mm] ac5b2c1891: vm-scalability.throughput -61.3% regression

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Date:   Mon, 3 Dec 2018 10:01:18 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     ying.huang@...el.com
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Michal Hocko <mhocko@...e.com>, s.priebe@...fihost.ag,
        mgorman@...hsingularity.net,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        alex.williamson@...hat.com, lkp@...org, rientjes@...gle.com,
        kirill@...temov.name, Andrew Morton <akpm@...ux-foundation.org>,
        zi.yan@...rutgers.edu, Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [LKP] [mm] ac5b2c1891: vm-scalability.throughput -61.3% regression

On Wed, Nov 28, 2018 at 8:48 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Tue, Nov 27, 2018 at 7:20 PM Huang, Ying <ying.huang@...el.com> wrote:
> >
> > In general, memory allocation fairness among processes should be a good
> > thing.  So I think the report should have been a "performance
> > improvement" instead of "performance regression".
>
> Hey, when you put it that way...
>
> Let's ignore this issue for now, and see if it shows up in some real
> workload and people complain.

Well, David Rientjes points out that it *does* cause real problems in
real workloads, so it's not just this benchmark run that shows the
issue.

So I guess we should revert, or at least fix. David, please post your
numbers again in public along with your suggested solution...

                   Linus