linux-kernel - Re: [RFC] sched,livepatch: call stop_one_cpu in klp_check_and_switch

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Message-ID: <1f94c48b4e0e7d73a689a076f78f0892095b4d89.camel@surriel.com>
Date:   Mon, 09 May 2022 15:49:52 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Song Liu <song@...nel.org>, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, vincent.guittot@...aro.org,
        jpoimboe@...hat.com, joe.lawrence@...hat.com, kernel-team@...com
Subject: Re: [RFC] sched,livepatch: call stop_one_cpu in
 klp_check_and_switch_task

On Mon, 2022-05-09 at 12:17 -0700, Josh Poimboeuf wrote:
> On Mon, May 09, 2022 at 03:10:16PM -0400, Rik van Riel wrote:
> 
> 
> > Should kernel threads that can use a lot of CPU have
> > something in their outer loop to transition KLPs,
> > just like the idle task does?
> 
> Maybe - I suppose this is the first time we've had an issue with
> CPU-bound kthreads.  I didn't know that was a thing ;-)
> 
Kworkers have as much work as you want them to do, and with
things like btrfs compression that can be quite a bit.

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