linux-kernel - Re: [PATCH 2/7] RT: Wrap the RQ notion of priority to make it conditional

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Date:	Mon, 15 Oct 2007 15:57:36 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/7] RT: Wrap the RQ notion of priority to make it
	conditional

On Mon, 2007-10-15 at 13:45 -0400, Steven Rostedt wrote:
> 
> --
> 
> On Fri, 12 Oct 2007, Gregory Haskins wrote:
> 
> > A little cleanup to avoid #ifdef proliferation later in the series
> >
> > Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
> 
> NACK
> 
> > ---
> >
> >  kernel/sched.c |   23 ++++++++++++++++++++---
> >  1 files changed, 20 insertions(+), 3 deletions(-)
> >
> > diff --git a/kernel/sched.c b/kernel/sched.c
> > index 0a1ad0e..c9afc8a 100644
> > --- a/kernel/sched.c
> > +++ b/kernel/sched.c
> > @@ -255,6 +255,10 @@ struct cfs_rq {
> >  #endif
> >  };
> >
> > +#if defined(CONFIG_PREEMPT_RT) && defined(CONFIG_SMP)
> > +#define  ENABLE_RQ_PRIORITY   /* Steve wants this conditional on PREEMPT_RT */
> 
> Yes, I do want it conditional. But only because we want to test it first,
> so the condition is really temporary. I agree with Peter that this should
> be for non PREEMPT_RT as well, and I'll work on a patch for upstream.
> 
> But these defines setting defines is just ugly.

Ok.  Keep in mind the spirit of the patch was to wrap the setting so we
didn't need more #ifdefs later, not so much to make that define.  I can
clean up the ifdef of ifdef part no problem.  I was just trying to keep
it one place to make the inevitable future change to share with non
PREEMPT_RT easier ;)


> 
> -- Steve
> 
> 
> > +#endif /* CONFIG_PREEMPT_RT */
> > +
> >  /* Real-Time classes' related field in a runqueue: */
> >  struct rt_rq {
> >  	struct rt_prio_array active;
> > @@ -304,6 +308,9 @@ struct rq {
> >  #ifdef CONFIG_PREEMPT_RT
> >  	unsigned long rt_nr_running;
> >  	unsigned long rt_nr_uninterruptible;
> > +#endif
> > +
> > +#ifdef ENABLE_RQ_PRIORITY
> >  	int curr_prio;
> >  #endif
> >
> > @@ -365,6 +372,16 @@ struct rq {
> >  static DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
> >  static DEFINE_MUTEX(sched_hotcpu_mutex);
> >
> > +#ifdef ENABLE_RQ_PRIORITY
> > +static inline void set_rq_prio(struct rq *rq, int prio)
> > +{
> > +	rq->curr_prio = prio;
> > +}
> > +
> > +#else
> > +#define set_rq_prio(rq, prio) do { } while(0)
> > +#endif
> > +
> >  static inline void check_preempt_curr(struct rq *rq, struct task_struct *p)
> >  {
> >  	rq->curr->sched_class->check_preempt_curr(rq, p);
> > @@ -2331,9 +2348,9 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
> >  	 */
> >  	prev_state = prev->state;
> >  	_finish_arch_switch(prev);
> > -#if defined(CONFIG_PREEMPT_RT) && defined(CONFIG_SMP)
> > -	rq->curr_prio = current->prio;
> > -#endif
> > +
> > +	set_rq_prio(rq, current->prio);
> > +
> >  	finish_lock_switch(rq, prev);
> >  #if defined(CONFIG_PREEMPT_RT) && defined(CONFIG_SMP)
> >  	/*
> >
> >
> >

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