linux-kernel - Re: [PATCH 4/4] x86/cpu/topology: Implement the CPU type sysfs interface

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Message-ID: <20201003085506.GB114893@kroah.com>
Date:   Sat, 3 Oct 2020 10:55:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     x86@...nel.org, Borislav Petkov <bp@...e.de>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Len Brown <len.brown@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH 4/4] x86/cpu/topology: Implement the CPU type sysfs
 interface

On Fri, Oct 02, 2020 at 06:17:45PM -0700, Ricardo Neri wrote:
> Recent Intel processors combine CPUs with different types of micro-
> architecture in the same package. There may be applications interested in
> knowing the type topology of the system. For instance, it can be used to
> to determine which subsets of CPUs share a common feature.
> 
> Implement cpu_type sysfs interfaces for Intel processors.
> 
> For example, in a system with four Intel Atom CPUs and one Intel Core CPU,
> these entries look as below. In this example, the native model IDs for
> both types of CPUs are 0:
> 
> user@...t:~$: ls /sys/devices/system/cpu/types
> intel_atom_0 intel_core_0
> 
> user@...t:~$ ls /sys/devices/system/cpu/types/intel_atom_0
> cpulist cpumap
> 
> user@...t:~$ ls /sys/devices/system/cpu/types/intel_core_0
> cpulist cpumap
> 
> user@...t:~$ cat /sys/devices/system/cpu/types/intel_atom/cpumap
> 0f
> 
> user@...t:~$ cat /sys/devices/system/cpu/types/intel_atom/cpulist
> 0-3
> 
> user@...t:~$ cat /sys/devices/system/cpu/types/intel_core/cpumap
> 10
> 
> user@...t:~$ cat /sys/devices/system/cpu/types/intel_core/cpulist
> 4

You used the same changelog text here as you did in patch 1/4, why?

thanks,

greg k-h