linux-kernel - Re: [PATCH v10 08/11] governors/haltpoll: drop kvm_para

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Message-ID: <87y0xt26af.fsf@oracle.com>
Date: Tue, 25 Feb 2025 11:06:16 -0800
From: Ankur Arora <ankur.a.arora@...cle.com>
To: "Christoph Lameter (Ampere)" <cl@...two.org>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, linux-pm@...r.kernel.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        catalin.marinas@....com, will@...nel.org, x86@...nel.org,
        pbonzini@...hat.com, vkuznets@...hat.com, rafael@...nel.org,
        daniel.lezcano@...aro.org, peterz@...radead.org, arnd@...db.de,
        lenb@...nel.org, mark.rutland@....com, harisokn@...zon.com,
        mtosatti@...hat.com, sudeep.holla@....com, maz@...nel.org,
        misono.tomohiro@...itsu.com, maobibo@...ngson.cn,
        zhenglifeng1@...wei.com, joao.m.martins@...cle.com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Subject: Re: [PATCH v10 08/11] governors/haltpoll: drop kvm_para_available()
 check


Christoph Lameter (Ampere) <cl@...two.org> writes:

> On Tue, 18 Feb 2025, Ankur Arora wrote:
>
>> So, we can safely forgo the kvm_para_available() check. This also
>> allows cpuidle-haltpoll to be tested on baremetal.
>
> I would hope that we will have this functionality as the default on
> baremetal after testing in the future.

Yeah, supporting haltpoll style adaptive polling on baremetal has some
way to go.

But, with Lifeng's patch-6 "ACPI: processor_idle: Support polling state
for LPI" we do get polling support in acpi-idle.

> Reviewed-by; Christoph Lameter (Ampere) <cl@...ux.com>

Thanks Christoph!

--
ankur