linux-kernel - Re: [PATCH RESEND 0/3] Represent cluster topology and enable load balance between clusters

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Message-ID: <YVwvzchbP5qbogjq@hirez.programming.kicks-ass.net>
Date:   Tue, 5 Oct 2021 12:58:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Barry Song <21cnbao@...il.com>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Ben Segall <bsegall@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guodong Xu <guodong.xu@...aro.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        "Cc: Len Brown" <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        Linuxarm <linuxarm@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Mel Gorman <mgorman@...e.de>, msys.mizuma@...il.com,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Will Deacon <will@...nel.org>, x86 <x86@...nel.org>,
        yangyicong <yangyicong@...wei.com>
Subject: Re: [PATCH RESEND 0/3] Represent cluster topology and enable load
 balance between clusters

On Tue, Oct 05, 2021 at 10:15:39PM +1300, Barry Song wrote:

> > (also, all this stuff being replicated across arch/*/Kconfig seems
> > unfortunate)
> 
> perhaps worth a separate patchset to do some cleanup so that SCHED_MC,
> SCHED_SMT etc
> won't be replicated in different architectures. Right now, this kind
> of Kconfig option is copied
> everywhere. I am seeing SCHED_SMT in all of
> arch/arm/Kconfig
> arch/arm64/Kconfig
> arch/ia64/Kconfig
> arch/mips/Kconfig
> arch/powerpc/Kconfig
> arch/s390/Kconfig
> arch/sparc/Kconfig
> arch/x86/Kconfig
> ...
> 
> Is it a better way to move them to a common Kconfig and let the architectures to
> declare things like ARCH_HAVE_SMT?

Dunno, it's all a bit of a mess :/ I can't quickly see a sane
pattern there.