linux-kernel - Re: [PATCH v1 5/6] x86/resctrl: Abstract PQR

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Date: Fri, 5 Apr 2024 10:15:07 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Peter Newman <peternewman@...gle.com>, Fenghua Yu <fenghua.yu@...el.com>,
	James Morse <james.morse@....com>
CC: Stephane Eranian <eranian@...gle.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>,
	"H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>, Juri
 Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt
	<rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, "Mel Gorman"
	<mgorman@...e.de>, Daniel Bristot de Oliveira <bristot@...hat.com>, Valentin
 Schneider <vschneid@...hat.com>, Uros Bizjak <ubizjak@...il.com>, Mike
 Rapoport <rppt@...nel.org>, "Kirill A. Shutemov"
	<kirill.shutemov@...ux.intel.com>, Rick Edgecombe
	<rick.p.edgecombe@...el.com>, Xin Li <xin3.li@...el.com>, Babu Moger
	<babu.moger@....com>, Shaopeng Tan <tan.shaopeng@...itsu.com>, "Maciej
 Wieczor-Retman" <maciej.wieczor-retman@...el.com>, Jens Axboe
	<axboe@...nel.dk>, Christian Brauner <brauner@...nel.org>, Oleg Nesterov
	<oleg@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Tycho Andersen
	<tandersen@...flix.com>, Nicholas Piggin <npiggin@...il.com>, Beau Belgrave
	<beaub@...ux.microsoft.com>, "Matthew Wilcox (Oracle)" <willy@...radead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 5/6] x86/resctrl: Abstract PQR_ASSOC from generic code

Hi Peter,

On 3/25/2024 10:27 AM, Peter Newman wrote:
> While CLOSID and RMID originated in RDT, the concept applies to other
> architectures, as it's standard to write allocation and monitoring IDs
> into per-CPU registers.
> 
>  - Rename resctrl_pqr_state and pqr_state to be more
>    architecturally-neutral.
> 
>  - Introduce resctrl_arch_update_cpu() to replace the explicit write to
>    MSR_IA32_PQR_ASSOC in __resctrl_sched_in(). In the case of MPAM,
>    PARTID[_I,D] and PMG are a simple function of closid, rmid, and an
>    internal global.
> 
>  - Update terminology containing explicit references to the PQR_ASSOC
>    register.

fyi ... I just noticed this while looking at the MPAM patches that there
is an instance in comments of update_closid_rmid() where this
was misspelled (PGR_ASSOC) and thus not picked up by your rename
script.

Reinette