Re: [PATCH 2/3][RT] sched: Do not compare cpu masks in scheduler

[Steven Rostedt <rostedt@goodmis.org>]

On Mon, 2011-09-26 at 11:08 -0400, Steven Rostedt wrote:

Grumble. Quilt seemed to have ignored the From: Peter ... part. 

The last two patches are Peter's not mine. I took his changes from a
patch he gave me on top of my patch.

-- Steve

> plain text document attachment
> (peterz-migrate-disable-no-cpu-compare.patch)
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> 
> Index: linux-rt.git/kernel/sched.c
> ===================================================================
> --- linux-rt.git.orig/kernel/sched.c
> +++ linux-rt.git/kernel/sched.c
> @@ -4235,16 +4235,12 @@ static inline void update_migrate_disabl
>  	 */
>  	mask = tsk_cpus_allowed(p);
>  
> -	WARN_ON(!cpumask_test_cpu(smp_processor_id(), mask));
> +	if (p->sched_class->set_cpus_allowed)
> +		p->sched_class->set_cpus_allowed(p, mask);
> +	p->rt.nr_cpus_allowed = cpumask_weight(mask);
>  
> -	if (!cpumask_equal(&p->cpus_allowed, mask)) {
> -		if (p->sched_class->set_cpus_allowed)
> -			p->sched_class->set_cpus_allowed(p, mask);
> -		p->rt.nr_cpus_allowed = cpumask_weight(mask);
> -
> -		/* Let migrate_enable know to fix things back up */
> -		p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
> -	}
> +	/* Let migrate_enable know to fix things back up */
> +	p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
>  }
>  
>  void migrate_disable(void)