linux-kernel - Re: [PATCH 0/4] Frequency invariance fixes for x86

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Date:   Thu, 16 Apr 2020 09:20:17 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Giovanni Gherdovich <ggherdovich@...e.cz>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>, 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>
Subject: Re: [PATCH 0/4] Frequency invariance fixes for x86

On Thu, Apr 16, 2020 at 07:47:41AM +0200, Giovanni Gherdovich wrote:
> Patches 1-3 address bugs in the current frequency invariance support for x86,
> including the incompatibility with cpu0 hotplug reported by Chris Wilson at
> https://lore.kernel.org/lkml/158556634294.3228.4889951961483021094@build.alporthouse.com/
> and the issue with CPUs that have less than 4 cores pointed out earlier
> today by Like Xu at
> https://lore.kernel.org/lkml/20200416021210.170736-1-like.xu@linux.intel.com/ 
> 
> Patch 4 is a minor code reorganization.
> 
> Giovanni Gherdovich (3):
>   x86, sched: Bail out of frequency invariance if base frequency is
>     unknown
>   x86, sched: Account for CPUs with less than 4 cores in freq.
>     invariance
>   x86, sched: Move check for CPU type to caller function
> 
> Peter Zijlstra (Intel) (1):
>   x86, sched: Don't enable static key when starting secondary CPUs
> 
>  arch/x86/kernel/smpboot.c | 47 +++++++++++++++++++++++++++++++++--------------
>  1 file changed, 33 insertions(+), 14 deletions(-)

Thanks!