linux-kernel - Re: [patch V3 0/6] softirq: Add RT specific softirq accounting

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Message-ID: <20210309213229.GT2696@paulmck-ThinkPad-P72>
Date:   Tue, 9 Mar 2021 13:32:29 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: Re: [patch V3 0/6] softirq: Add RT specific softirq accounting

On Tue, Mar 09, 2021 at 09:55:52AM +0100, Thomas Gleixner wrote:
> RT runs softirq processing always in thread context and it requires that
> both the softirq execution and the BH disabled sections are preemptible.
> 
> This is achieved by serialization through per CPU local locks and
> substituting a few parts of the existing softirq processing code with
> helper functions.
> 
> The series applies on top of
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git tasklet-2021-03-09
> 
> and is completely available from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git softirq
> 
> Changes to V2 which can be found here:
> 
>   https://lore.kernel.org/r/20201204170151.960336698@linutronix.de
> 
>  - Split the tasklet changes out (seperate submission)
>  
>  - Rebase it on the tasklet series (no further changes)

Passes modest rcutorture testing, and I do like the "NOHZ tick-stop
error" maybe going away!  That error is rare enough that it will take
some time to be reasonably certain.  In the meantime:

Tested-by: Paul E. McKenney <paulmck@...nel.org>