linux-kernel - Re: [PATCH v2 13/16] x86/resctrl: Add code to display core telemetry events

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Message-ID: <bb1ceb6c-e855-41c6-b15b-cf3eeafd7da8@intel.com>
Date: Mon, 31 Mar 2025 09:23:48 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghuay@...dia.com>, "Maciej
 Wieczor-Retman" <maciej.wieczor-retman@...el.com>, Peter Newman
	<peternewman@...gle.com>, James Morse <james.morse@....com>, Babu Moger
	<babu.moger@....com>, Drew Fustini <dfustini@...libre.com>, Dave Martin
	<Dave.Martin@....com>
CC: <linux-kernel@...r.kernel.org>, <patches@...ts.linux.dev>
Subject: Re: [PATCH v2 13/16] x86/resctrl: Add code to display core telemetry
 events

Hi Tony,

(nit: "Add code to" can be dropped from shortlog)

On 3/21/25 4:16 PM, Tony Luck wrote:
> These can be read from any CPU. Rely on the smp_call*() functions
> picking the current CPU when given a free choice from cpu_online_mask.
> 
> There may be multiple devices tracking each package, so scan all of them
> and add up counters.
> 
> Output format depends on the data type. Either a 63 bit integer, or a
> fixed point decimal.
> 

At this point the architecture and fs code is very intertwined. I hope that
some of the items I mentioned in earlier patches will help to support a clear
separation that will make the code that follows from here on easier to split
between arch and fs. 
For example, I think this may end up with the new event enums defined in
include/linux/resctrl_types.h to support new architectural helpers
that take the enum as argument that the fs code can use to request the
event value from the architecture. 

Reinette