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From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Luck, Tony" <tony.luck@intel.com>,
	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
	x86@kernel.org, Borislav Petkov <bp@suse.de>,
	Ingo Molnar <mingo@kernel.org>, Len Brown <len.brown@intel.com>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	linux-kernel@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
	"Liang, Kan" <kan.liang@intel.com>
Subject: Re: [PATCH 0/3] x86: Add initial support to discover Intel hybrid CPUs
Date: Sat, 3 Oct 2020 16:39:23 +0200	[thread overview]
Message-ID: <20201003143923.GC2628@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <87lfgnd1tm.fsf@nanos.tec.linutronix.de>

On Sat, Oct 03, 2020 at 12:46:29PM +0200, Thomas Gleixner wrote:
> > There might be some model specific performance counter events that only
> > apply to some cores. Or a machine check error code that is logged in the
> > model specific MSCOD field of IA32_MCi_STATUS. But any and all code can run
> > on any core.
> 
> Ok. The perf side should be doable, IIRC we already have something like
> that, but Peter should know better.

Yes, ARM big.LITTLE has horrible hacks. Please look at them for
inspiration.

Also, I once started (and never found time to finish)..

  https://lkml.kernel.org/r/20181010104559.GO5728@hirez.programming.kicks-ass.net

Kan should be aware of all this.

  reply	other threads:[~2020-10-03 14:39 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-02 20:19 Ricardo Neri
2020-10-02 20:19 ` [PATCH 1/3] x86/cpufeatures: Enumerate hybrid CPU feature bit Ricardo Neri
2020-10-02 20:19 ` [PATCH 2/3] x86/cpu: Describe hybrid CPUs in cpuinfo_x86 Ricardo Neri
2020-10-02 20:34   ` Borislav Petkov
2020-10-02 21:02     ` Ricardo Neri
2020-10-02 21:03       ` Borislav Petkov
2020-10-02 23:41         ` Ricardo Neri
2020-10-02 20:19 ` [PATCH 3/3] x86/mce: include type of core when reporting a machine check error Ricardo Neri
2020-10-03  1:39 ` [PATCH 0/3] x86: Add initial support to discover Intel hybrid CPUs Thomas Gleixner
2020-10-03  2:17   ` Luck, Tony
2020-10-03  9:04     ` Borislav Petkov
2020-10-06  0:24       ` Ricardo Neri
2020-10-03 10:46     ` Thomas Gleixner
2020-10-03 14:39       ` Peter Zijlstra [this message]
2020-10-06  0:21       ` Ricardo Neri

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