linux-kernel - Re: [PATCH 0/9] Add CPU-type to topology

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Date: Thu, 27 Jun 2024 12:54:57 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...el.com>, Brice Goglin
 <brice.goglin@...il.com>,
 srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, daniel.sneddon@...ux.intel.com, tony.luck@...el.com,
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
 linux-perf-users@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Andrew Cooper <andrew.cooper3@...rix.com>,
 Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: Re: [PATCH 0/9] Add CPU-type to topology

On 2024-06-27 9:22 a.m., Pawan Gupta wrote:
> On Thu, Jun 27, 2024 at 05:51:54AM -0700, Ricardo Neri wrote:
>> ARM gives userspace specific details. This makes more sense to me. Instead
>> of reading these details, user space would have to infer these details if
>> a CPU type was given in sysfs.
>>
>> Having said that, Intel does have a CPUID leaf that gives the CPU type. Such
>> leaf also has a "Native Model ID". Exposing only the CPU type may not be
>> sufficient.
> 
> Do we know if there are applications that would benefit from this information?
> 

Perf should needs it in the kernel to distinguish between different type
of e-cores on ARL-H.

+Dapeng, who is working on ARL-H PMU enabling.

Thanks,
Kan