linux-kernel - Re: [RFC PATCH 0/6] Improve VM DVFS and task placement behavior

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Message-ID: <ZCYuLPlEFUnxPm4A@casper.infradead.org>
Date:   Fri, 31 Mar 2023 01:49:48 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Dai <davidai@...gle.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        kernel-team@...roid.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev
Subject: Re: [RFC PATCH 0/6] Improve VM DVFS and task placement behavior

On Thu, Mar 30, 2023 at 03:43:35PM -0700, David Dai wrote:
> Hi,
> 
> This patch series is a continuation of the talk Saravana gave at LPC 2022
> titled "CPUfreq/sched and VM guest workload problems" [1][2][3]. The gist
> of the talk is that workloads running in a guest VM get terrible task
> placement and DVFS behavior when compared to running the same workload in

DVFS?  Some new filesystem, perhaps?

> the host. Effectively, no EAS for threads inside VMs. This would make power

EAS?

Two unfamiliar and undefined acronyms in your opening paragraph.
You're not making me want to read the rest of your opus.