linux-kernel - [RFC 0/2] Do not slow down some AMD devices with coresched

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Date:   Wed, 11 Nov 2020 16:10:09 -0500
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>, tglx@...utronix.de,
        linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, torvalds@...ux-foundation.org,
        fweisbec@...il.com, keescook@...omium.org, kerrnel@...gle.com,
        Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>, joel@...lfernandes.org,
        vineeth@...byteword.org, Chen Yu <yu.c.chen@...el.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Agata Gruza <agata.gruza@...el.com>,
        Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>,
        graf@...zon.com, konrad.wilk@...cle.com, dfaggioli@...e.com,
        pjt@...gle.com, rostedt@...dmis.org, derkling@...gle.com,
        benbjiang@...cent.com,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Dhaval Giani <dhaval.giani@...cle.com>,
        Junaid Shahid <junaids@...gle.com>, jsbarnes@...gle.com,
        chris.hyser@...cle.com, Ben Segall <bsegall@...gle.com>,
        Josh Don <joshdon@...gle.com>, Hao Luo <haoluo@...gle.com>,
        amistry@...gle.com, Borislav Petkov <bp@...en8.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>, Mike Rapoport <rppt@...nel.org>,
        thomas.lendacky@....com, Tony Luck <tony.luck@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT))
Subject: [RFC 0/2] Do not slow down some AMD devices with coresched

Hi,
Here are 2 patches I am thinking of sending with next coresched series. Let me
know what you think. These are for not slowing down certain AMD devices if they
don't have vulnerabilities that require coresched.

1/2 - keep coresched disabled if device doesn't have vulnerability.
2/2 - add debug information.

In the future, if needed we could add more options to make it possible to
force-enable coresched. But right now I don't see a need for that, till a
usecase arises.

Joel Fernandes (Google) (2):
x86/bugs: Disable coresched on hardware that does not need it
sched/debug: Add debug information about whether coresched is enabled

arch/x86/kernel/cpu/bugs.c | 8 ++++++++
kernel/sched/core.c        | 7 +++++++
kernel/sched/debug.c       | 4 ++++
kernel/sched/sched.h       | 5 +++++
4 files changed, 24 insertions(+)

--
2.29.2.222.g5d2a92d10f8-goog