Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

[Peter Zijlstra]

On Tue, Dec 19, 2017 at 10:01:46AM -0600, Christopher Lameter wrote:
> On Tue, 19 Dec 2017, Peter Zijlstra wrote:
> 
> > On Tue, Dec 19, 2017 at 04:23:57AM +0100, Frederic Weisbecker wrote:
> > > When a CPU runs in full dynticks mode, a 1Hz tick remains in order to
> > > keep the scheduler stats alive. However this residual tick is a burden
> > > for Real-Time tasks that can't stand no interruption at all.
> >
> > I'm not sure that is accurate. RT doesn't necessarily have anything much
> > to so with this. The tick is per definition very deterministic and thus
> > should not be a problem.
> 
> Depends what one means by RT. 

Real Time computing as per the literature. Any other definition is
wrong and confusing.