linux-kernel - Re: [PATCH v2 2/3] x86, sched: Bail out of frequency invariance if turbo frequency is unknown

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Message-ID: <20200706201956.GA1390666@iweiny-DESK2.sc.intel.com>
Date:   Mon, 6 Jul 2020 13:19:56 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Giovanni Gherdovich <ggherdovich@...e.cz>,
        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>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] x86, sched: Bail out of frequency invariance if
 turbo frequency is unknown

On Mon, Jun 01, 2020 at 04:34:18PM -0700, Ricardo Neri wrote:
> On Sun, May 31, 2020 at 08:24:52PM +0200, Giovanni Gherdovich wrote:
> > There may be CPUs that support turbo boost but don't declare any turbo
> > ratio, i.e. their MSR_TURBO_RATIO_LIMIT is all zeroes. In that condition
> > scale-invariant calculations can't be performed.
> > 
> > Signed-off-by: Giovanni Gherdovich <ggherdovich@...e.cz>
> > Suggested-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> 
> FWIW,
> 
> Tested-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>

Is this going to make it as a fix to 5.8?

Tested-by: Ira Weiny <ira.weiny@...el.com>