Re: [PATCH] sched/deadline: fix switching to -deadline

[luca abeni]

On Fri, 21 Apr 2017 11:42:40 +0200
luca abeni <luca.abeni@xxxxxxxxxxxxxxx> wrote:
[...]
> > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
> > > index a2ce590..ec53d24 100644
> > > --- a/kernel/sched/deadline.c
> > > +++ b/kernel/sched/deadline.c
> > > @@ -950,6 +950,10 @@ enqueue_dl_entity(struct sched_dl_entity
> > > *dl_se, update_dl_entity(dl_se, pi_se);
> > >  	else if (flags & ENQUEUE_REPLENISH)
> > >  		replenish_dl_entity(dl_se, pi_se);
> > > +	else if ((flags & ENQUEUE_RESTORE) &&    
> > 
> > Not sure I understand how this works. AFAICT we are doing
> > __sched_setscheduler() when we want to catch the case of a new
> > dl_entity (SCHED_{OTHER,FIFO} -> SCHED_DEADLINE}, but queue_flags
> > (which are passed to enqueue_task()) don't seem to have
> > ENQUEUE_RESTORE set?  
> 
> I was under the impression sched_setscheduler() sets
> ENQUEUE_RESTORE...

__sched_setscheduler() sets queue_flags to DEQUEUE_SAVE, which matches
ENQUEUE_RESTORE (see comments in sched/sched.h), so things should work
correctly, right?



				Luca