linux-kernel - Re: Consider switching to WQ_UNBOUND messages (was: Re: [PATCH v2 6/7] workqueue: Report work funcs that trigger automatic CPU

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Message-ID: <20230712080504.GA3100107@hirez.programming.kicks-ass.net>
Date:   Wed, 12 Jul 2023 10:05:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-team@...a.com, Linux PM list <linux-pm@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-rtc@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: Consider switching to WQ_UNBOUND messages (was: Re: [PATCH v2
 6/7] workqueue: Report work funcs that trigger automatic CPU_INTENSIVE
 mechanism)

On Tue, Jul 11, 2023 at 11:39:17AM -1000, Tejun Heo wrote:

> I wonder whether the right thing to do here is somehow scaling the threshold
> according to the relative processing power. It's difficult to come up with a
> threshold which works well across the latest & fastest and really tiny CPUs.
> I'll think about it some more but if you have some ideas, please feel free
> to suggest.

We could scale by BogoMIPS I suppose, it's a bogus measurement, as per
the name, but it does have some relation to how fast the machine is.