linux-kernel - Re: [PATCH 0/10] psi: pressure stall information for CPU, memory, and IO v2

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Message-ID: <CAD8Lp45W00ga-P-nb6iytgSGW4xwSzmaTHA87DOvSotN0S2edw@mail.gmail.com>
Date:   Tue, 17 Jul 2018 07:13:52 -0500
From:   Daniel Drake <drake@...lessm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     hannes@...xchg.org, Linux Kernel <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        Linux Upstreaming Team <linux@...lessm.com>,
        linux-block@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Mike Galbraith <efault@....de>,
        Oliver Yang <yangoliver@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        xxx xxx <x.qendo@...il.com>,
        Taras Kondratiuk <takondra@...co.com>,
        Daniel Walker <danielwa@...co.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Ruslan Ruslichenko <rruslich@...co.com>, kernel-team@...com
Subject: Re: [PATCH 0/10] psi: pressure stall information for CPU, memory, and
 IO v2

On Tue, Jul 17, 2018 at 6:25 AM, Michal Hocko <mhocko@...nel.org> wrote:
> Yes this is really unfortunate. One thing that could help would be to
> consider a trashing level during the reclaim (get_scan_count) to simply
> forget about LRUs which are constantly refaulting pages back. We already
> have the infrastructure for that. We just need to plumb it in.

Can you go into a bit more detail about that infrastructure and how we
might detect which pages are being constantly refaulted? I'm
interested in spending a few hours on this topic to see if I can come
up with anything.

Thanks
Daniel