linux-kernel - Re: [PATCH] Add busy loop polling for idle SMT

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Message-ID: <YZdtceRRxJQRt8cZ@hirez.programming.kicks-ass.net>
Date:   Fri, 19 Nov 2021 10:25:05 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Peng Wang <rocking@...ux.alibaba.com>
Cc:     mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add busy loop polling for idle SMT

On Fri, Nov 19, 2021 at 11:19:03AM +0800, Peng Wang wrote:
> 
> Yes, idle SMT busy loop polling can only provide approximately pipeline
> interference for normal instructions.
> 
> When it comes to AVX works, we notice an idea modifing CPU time
> accounting[1], do you think the combination can lead to a feasible
> solution, or any other better ideas?

I'm not at all interested in solving this business model induced brain
trauma.