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

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Message-ID: <CAHk-=whrfDw4yV4h2ijbX3vpXf5m4hzJ5pGX7_v6pU31RGib-g@mail.gmail.com>
Date:   Mon, 3 Dec 2018 10:19:55 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     mhocko@...nel.org
Cc:     ying.huang@...el.com, Andrea Arcangeli <aarcange@...hat.com>,
        s.priebe@...fihost.ag, mgorman@...hsingularity.net,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        alex.williamson@...hat.com, lkp@...org,
        David Rientjes <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 Mon, Dec 3, 2018 at 10:15 AM Michal Hocko <mhocko@...nel.org> wrote:
>
> The thing is that there is no universal win here. There are two
> different types of workloads and we cannot satisfy both.

Ok, if that's the case, then I'll just revert the commit.

Michal, our rules are very simple: we don't generate regressions. It's
better to have old reliable behavior than to start creating *new*
problems.

                 Linus