linux-kernel - Re: [PATCH v2] sched/deadline: remove useless param from setup_new_dl

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Date:	Mon, 4 Jul 2016 10:28:28 +0100
From:	Juri Lelli <juri.lelli@....com>
To:	luca abeni <luca.abeni@...tn.it>
Cc:	peterz@...radead.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH v2] sched/deadline: remove useless param from
 setup_new_dl_entity

On 04/07/16 11:03, Luca Abeni wrote:
> Hi Juri,
> 
> On Wed, 29 Jun 2016 20:07:43 +0100
> Juri Lelli <juri.lelli@....com> wrote:
> 
> > setup_new_dl_entity() takes two parameters, but it only actually uses
> > one of them, under a different name, to setup a new dl_entity, after:
> > 
> >  2f9f3fdc928 "sched/deadline: Remove dl_new from struct
> > sched_dl_entity"
> > 
> > as we currently do
> > 
> >  setup_new_dl_entity(&p->dl, &p->dl)
> > 
> > However, before Luca's change we were doing
> > 
> >  setup_new_dl_entity(dl_se, pi_se)
> > 
> > in update_dl_entity() for a dl_se->new entity: we were using pi_se's
> > parameters (the potential PI donor) for setting up a new entity.
> > 
> > Restore this behaviour (as we want to correctly initialize parameters
> > of a boosted task that enters DEADLINE) by removing the useless second
> > parameter of setup_new_dl_entity() and retrieving the top waiter
> > directly from inside that function.
> I did not have time to test this patch yet, but it still looks good to
> me.
> 

Thanks for reviewing it.

Best,

- Juri