linux-kernel - Re: [v4.14-rt][report] arm: run: stress-ng --class os --all 0 -t 5m

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Message-ID: <20171219153310.aq2rxw6umgyyku3p@linutronix.de>
Date:   Tue, 19 Dec 2017 16:33:10 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v4.14-rt][report] arm: run: stress-ng --class os --all 0 -t 5m

On 2017-12-19 10:28:39 [-0500], Steven Rostedt wrote:
> On Tue, 19 Dec 2017 16:04:18 +0100
> Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
> > > 
> > > The above just seems wrong. local_irq_disable() should imply
> > > local_bh_disable(), as it doesn't let softirqs run either.  
> > 
> > Where does local_irq_disable() imply this?
> 
> If it doesn't explicitly do so, it probably should. How can we have a
> softirq execute when irqs are disabled?

There are not. With local_bh_disable() the softirq will run on
local_bh_enable(). Without it (and with or without local_irq_disable())
the softirq won't run but wakeup the ksoftirq thread. We can't do the
wake while holding the hrtimer lock. This is not RT specific.

> -- Steve

Sebastian