linux-kernel - Re: 2.6.24-rc7-rt1

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Date:	Mon, 14 Jan 2008 07:13:00 -0500
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Mike Galbraith" <efault@....de>,
	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Mariusz Kozlowski" <m.kozlowski@...land.pl>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"RT" <linux-rt-users@...r.kernel.org>
Subject: Re: 2.6.24-rc7-rt1

>>> On Mon, Jan 14, 2008 at  3:27 AM, in message
<1200299260.4665.17.camel@...er.simson.net>, Mike Galbraith <efault@....de>
wrote: 

> On Sun, 2008-01-13 at 15:54 -0500, Steven Rostedt wrote:
> 
>> OK, -rt2 will take a bit more beating from me before I release it, so it
>> might take some time to get it out (expect it out on Monday).
> 
> Ah, that reminds me (tests, yup) I still need the patchlet below to
> resume from ram without black screen of death.

I had forgotten about this issue over the holidays...Sorry Mike.

So does that BUG_ON trip if you remove the first hunk?

> No idea why my P4 box
> seems to be the only box in the rt galaxy affected.  (haven't poked at
> it since the holidays)
> 
> Index: linux-2.6.24.git-rt1/kernel/sched_rt.c
> ===================================================================
> --- linux-2.6.24.git-rt1.orig/kernel/sched_rt.c
> +++ linux-2.6.24.git-rt1/kernel/sched_rt.c
> @@ -33,6 +33,9 @@ static inline void rt_clear_overload(str
>  
>  static void update_rt_migration(struct rq *rq)
>  {
> +	if (unlikely(num_online_cpus() == 1))
> +		return;
> +
>  	if (rq->rt.rt_nr_migratory && (rq->rt.rt_nr_running > 1)) {
>  		if (!rq->rt.overloaded) {
>  			rt_set_overload(rq);
> @@ -105,8 +108,10 @@ static inline void dec_rt_tasks(struct t
>  		} /* otherwise leave rq->highest prio alone */
>  	} else
>  		rq->rt.highest_prio = MAX_RT_PRIO;
> -	if (p->nr_cpus_allowed > 1)
> +	if (p->nr_cpus_allowed > 1) {
> +		BUG_ON(!rq->rt.rt_nr_migratory);
>  		rq->rt.rt_nr_migratory--;
> +	}
>  
>  	if (rq->rt.highest_prio != highest_prio)
>  		cpupri_set(&rq->rd->cpupri, rq->cpu, rq->rt.highest_prio);
> 
> 
> btw, CONFIG_INTEL_IOATDMA compile booboo
> 
>   CC      drivers/dma/ioat_dma.o
> drivers/dma/ioat_dma.c: In function ‘ioat1_tx_submit’:
> drivers/dma/ioat_dma.c:300: error: too few arguments to function 
> ‘__list_splice’
> make[2]: *** [drivers/dma/ioat_dma.o] Error 1
> 
> 
> -
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