linux-kernel - Re: [PATCH 1/1] selftests: KVM: add test to print boottime wallclock

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Message-ID: <7a5bf7b384b1e4f0a6a4f8fca9b6c854a4ab69ef.camel@infradead.org>
Date:   Fri, 20 Oct 2023 16:21:35 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     Dongli Zhang <dongli.zhang@...cle.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        shuah@...nel.org, joe.jin@...cle.com
Subject: Re: [PATCH 1/1] selftests: KVM: add test to print boottime wallclock

On Fri, 2023-10-20 at 07:39 -0700, Dongli Zhang wrote:
> 
> 1. Capture boottime_wallclock_01.
> 2. Wait for 10-second by default (configurable, e.g., max 60-second)
> 3. Capture boottime_wallclock_02.
> 4. Report error if drift.
> 
> 
> I have another pvclock vCPU hotplug test with the same flow.

Wallclock, or CLOCK_TAI? You'll going to get the odd one-second jump
with the former. 

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