linux-kernel - Re: [PATCH 1/4] x86, sched: Bail out of frequency invariance if base frequency is unknown

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Date:   Thu, 16 Apr 2020 08:41:09 +0200
From:   Giovanni Gherdovich <ggherdovich@...e.cz>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>, Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:     x86@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mel Gorman <mgorman@...hsingularity.net>,
        Doug Smythies <dsmythies@...us.net>,
        Like Xu <like.xu@...ux.intel.com>,
        Neil Rickert <nwr10cst-oslnx@...oo.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Dario Faggioli <dfaggioli@...e.com>
Subject: Re: [PATCH 1/4] x86, sched: Bail out of frequency invariance if
 base frequency is unknown

+Dario Faggioli

On Thu, 2020-04-16 at 07:47 +0200, Giovanni Gherdovich wrote:
> Some hypervisors such as VMWare ESXi 5.5 advertise support for
> X86_FEATURE_APERFMPERF but then fill all MSR's with zeroes. In particular,
> MSR_PLATFORM_INFO set to zero tricks the code that wants to know the base
> clock frequency of the CPU (highest non-turbo frequency), producing a
> division by zero when computing the ratio turbo_freq/base_freq necessary
> for frequency invariant accounting.
> 
> It is to be noted that even if MSR_PLATFORM_INFO contained the appropriate
> data, APERF and MPERF are constantly zero on ESXi 5.5, thus freq-invariance
> couldn't be done in principle (not that it would make a lot of sense in a
> VM anyway). The real problem is advertising X86_FEATURE_APERFMPERF. This
> appears to be fixed in more recent versions: ESXi 6.7 doesn't advertise
> that feature.
> 
> Signed-off-by: Giovanni Gherdovich <ggherdovich@...e.cz>
> Fixes: 1567c3e3467c ("x86, sched: Add support for frequency invariance")
> ---
>  arch/x86/kernel/smpboot.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index fe3ab9632f3b..3a318ec9bc17 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -1985,6 +1985,15 @@ static bool intel_set_max_freq_ratio(void)
>  	return false;
>  
>  out:
> +	/*
> +	 * Some hypervisors advertise X86_FEATURE_APERFMPERF
> +	 * but then fill all MSR's with zeroes.
> +	 */
> +	if (!base_freq) {
> +		pr_debug("Couldn't determine cpu base frequency, necessary for scale-invariant accounting.\n");
> +		return false;
> +	}
> +
>  	arch_turbo_freq_ratio = div_u64(turbo_freq * SCHED_CAPACITY_SCALE,
>  					base_freq);
>  	arch_set_max_freq_ratio(turbo_disabled());