linux-kernel - RE: sched/fair: scheduler not running high priority process on idle cpu

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Date:   Wed, 15 Jan 2020 14:43:26 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Steven Rostedt' <rostedt@...dmis.org>
CC:     'Vincent Guittot' <vincent.guittot@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: sched/fair: scheduler not running high priority process on idle
 cpu

From: Steven Rostedt
> Sent: 15 January 2020 13:19
...
> BTW, I believe distros compile with "CONFIG_IRQ_FORCED_THREADING" which
> means if you add to the kernel command line "threadirqs" the interrupts
> will be run as threads. Which allows for even more preemption.

So they do...
I guess that'll stop the bh code running 'on top of' my RT thread.
But won't help getting the RT process running when the 'events_unbound'
kernel worker is running.

They also use grub2 which is so complicated update-grub is always used
which dumbs everything down to a default set that is hard to change.

	David

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