Re: [PATCH] sched/rt: RT_RUNTIME_GREED sched feature

From: Steven Rostedt
Date: Mon Nov 07 2016 - 15:00:26 EST

On Mon, 7 Nov 2016 13:30:15 -0600 (CST)
Christoph Lameter <cl@xxxxxxxxx> wrote:

> SCHED_RR tasks alternately running on on cpu can cause endless deferral of
> kworker threads. With the global effect of the OS processing reserved
> it may be the case that the processor we are executing never gets any
> time. And if that kworker threads role is releasing a mutex (like the
> cgroup_lock) then deadlocks can result.

I believe SCHED_RR tasks will still throttle if they use up too much of
the CPU. But I still don't see how this patch helps your situation.

-- Steve