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

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Message-ID: <Pine.LNX.4.58.0710151343300.26495@gandalf.stny.rr.com>
Date:	Mon, 15 Oct 2007 13:45:32 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Gregory Haskins <ghaskins@...ell.com>
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 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.

-- 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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