linux-kernel - Re: [PATCH 2/2] Revert "x86/hpet: Reduce HPET counter read contention"

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Message-ID: <alpine.DEB.2.21.1903201123510.1906@nanos.tec.linutronix.de>
Date:   Wed, 20 Mar 2019 11:24:20 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Waiman Long <longman@...hat.com>
cc:     Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Srinivas Eeda <srinivas.eeda@...cle.com>, x86@...nel.org
Subject: Re: [PATCH 2/2] Revert "x86/hpet: Reduce HPET counter read
 contention"

On Mon, 18 Mar 2019, Waiman Long wrote:
> On 03/18/2019 04:44 AM, Zhenzhong Duan wrote:
> > https://lkml.org/lkml/2019/3/15/101
> >
> I think what Thomas was asking is to provide a REALISTIC use case where
> TSC is wrecked and HPET is somehow not used and we have to fall back to
> use PM timer. If such use case exists, I am sure Thomas will be happy to
> take it.

Exactly.

Thanks,

	tglx