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

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Date: Thu, 27 Jun 2024 08:22:59 -0700
From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To: Brice Goglin <brice.goglin@...il.com>
Cc: Pawan Gupta <pawan.kumar.gupta@...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>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: [PATCH 0/9] Add CPU-type to topology

On Tue, Jun 18, 2024 at 02:49:10PM +0200, Brice Goglin wrote:
> Le 17/06/2024 à 11:11, Pawan Gupta a écrit :

[...]
 
> Hello
> 
> Is there still a plan to expose this info in sysfs? Userspace currently uses
> frequencies to guess which cores are E or P. Intel sent some patches several
> years ago [1], but they got abandoned nowhere as far as I know.

At the time of writing those patches an alternative interface emerged from
perf sysfs. You can read the CPUs of a given type from
/sys/devices/cpu_{core,atom}/cpus .

Yes, this is perf sysfs, but is not obvious from the name and has a list of
CPUs. It meet the need, IMO.