linux-kernel - Re: [PATCH] sched/rt: RT_RUNTIME

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Message-ID: <20161107133207.4282de69@gandalf.local.home>
Date:   Mon, 7 Nov 2016 13:32:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Christoph Lameter <cl@...ux.com>
Cc:     Daniel Bristot de Oliveira <bristot@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature

On Mon, 7 Nov 2016 10:55:38 -0600 (CST)
Christoph Lameter <cl@...ux.com> wrote:

> On Mon, 7 Nov 2016, Daniel Bristot de Oliveira wrote:
> 
> > With these two options set, the user will guarantee some runtime
> > for non-rt-tasks on all CPUs, while keeping real-time tasks running
> > as much as possible.  
> 
> Excellent this would improve the situation with deadlocks as a result of
> cgroup_locks not being released due to lack of workqueue processing.

?? What deadlocks do you see? I mean, can you show the situation that
throttling RT tasks will cause deadlock?

Sorry, but I'm just not seeing it.

-- Steve