linux-kernel - Re: [PATCH v3 1/2] cpu/smt: add a notifier to notify the SMT changes

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Message-ID: <20230329071014.GC7701@hirez.programming.kicks-ass.net>
Date:   Wed, 29 Mar 2023 09:10:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wenyou Yang <WenYou.Yang@....com>
Cc:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, evan.quan@....com, mario.limonciello@....com,
        bp@...e.de, jpoimboe@...nel.org, kim.phillips@....com,
        tglx@...utronix.de, weiyuan2@....com, richardqi.liang@....com,
        ying.li@....com, kunliu13@....com, gpiccoli@...lia.com,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] cpu/smt: add a notifier to notify the SMT changes

On Wed, Mar 29, 2023 at 09:51:48AM +0800, Wenyou Yang wrote:
> Add the notifier chain to notify the cpu SMT status changes
> 

Why!?!? What's the purpose of all this? IIRC this doesn't trigger if you
manually disable all the siblings. And because you didn't tell us why
you need this I can't tell you if that matters or not :/