Re: [PATCH 13/23] sched,ion: Convert to sched_set_normal()
From: Vincent Guittot
Date: Wed Apr 22 2020 - 11:53:11 EST
On Wed, 22 Apr 2020 at 17:39, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Wed, Apr 22, 2020 at 05:09:15PM +0200, Vincent Guittot wrote:
> > > It's not unbounded, like a true idle-time scheduler would be, but it can
> > > still be pretty horrible. nice19 has some of that too of course, but
> > > idle has it worse, esp. also because it begs others to preempt it.
> >
> > Yeah... you have to pay the benefit of letting other tasks to preempt
> > faster. But both sched_idle and nice19 have the same weight
>
> #define WEIGHT_IDLEPRIO 3
>
> /* 15 */ 36, 29, 23, 18, 15,
>
> 15 != 3
Good point
Don't know why I thought they had same weight
>
> Also, like said elsewhere, idle is much more eager to let itself be
> preempted.