linux-kernel - Re: [PATCH v3 1/5] x86/mm: change l1d flush runtime prctl behaviour

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Message-ID: <87r1o59t5f.fsf@nanos.tec.linutronix.de>
Date:   Fri, 04 Dec 2020 22:07:56 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Balbir Singh <sblbir@...zon.com>, mingo@...hat.com
Cc:     peterz@...radead.org, linux-kernel@...r.kernel.org,
        keescook@...omium.org, jpoimboe@...hat.com, tony.luck@...el.com,
        benh@...nel.crashing.org, x86@...nel.org, dave.hansen@...el.com,
        thomas.lendacky@....com, torvalds@...ux-foundation.org,
        Balbir Singh <sblbir@...zon.com>
Subject: Re: [PATCH v3 1/5] x86/mm: change l1d flush runtime prctl behaviour

On Fri, Nov 27 2020 at 17:59, Balbir Singh wrote:

> Detection of task affinities at API opt-in time is not the best
> approach, the approach is to kill the task if it runs on a
> SMT enable core. This is better than not flushing the L1D cache
> when the task switches from a non-SMT core to an SMT enabled core.
>
> Signed-off-by: Balbir Singh <sblbir@...zon.com>
> ---
>  arch/x86/include/asm/processor.h |  2 ++
>  arch/x86/kernel/smpboot.c        | 11 ++++++++++-
>  2 files changed, 12 insertions(+), 1 deletion(-)

Subject, changelog match but patch content not so much :)