linux-kernel - Re: [PATCH v1 1/6] x86/resctrl: Move __resctrl_sched

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Date: Mon, 8 Apr 2024 12:05:28 -0700
From: Peter Newman <peternewman@...gle.com>
To: Reinette Chatre <reinette.chatre@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>, James Morse <james.morse@....com>, 
	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 1/6] x86/resctrl: Move __resctrl_sched_in() out-of-line

Hi Reinette,

On Sun, Apr 7, 2024 at 12:21 PM Reinette Chatre
<reinette.chatre@...el.com> wrote:
>
> I think this needs more thought. rdt_enable_key is x86 specific now and should not
> be in the fs code. Every architecture will have its own task switch code, with
> __resctrl_sched_in() belonging to x86 and thus not something to be directly called
> from the fs code.

I think we will need to discuss whether __resctrl_sched_in() is really
arch or FS code following the changes in this series. This series
removes the explicit MSR access and James has already provided inline
wrappers for the mon and alloc enable keys[1], so I can only assume
they are architecture-independent in concept.

Thanks!
-Peter

https://lore.kernel.org/r/20240213184438.16675-18-james.morse@arm.com