linux-kernel - Re: [RFC PATCH -rt 1/2] RCU priority boosting that survives vicious testing

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Date:	Fri, 2 Feb 2007 07:56:46 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	dipankar@...ibm.com, tytso@...ibm.com, dvhltc@...ibm.com,
	oleg@...sign.ru, twoerner.k@...il.com, josh@...edesktop.org,
	billh@...ppy.monkey.org, nielsen.esben@...glemail.com,
	corbet@....net
Subject: Re: [RFC PATCH -rt 1/2] RCU priority boosting that survives vicious testing

On Thu, Feb 01, 2007 at 09:23:33AM +0100, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > Here is the RCU priority-boosting patch.  Pretty close to the 
> > http://lkml.org/lkml/2007/1/24/295 version.  This patch prevents 
> > preempted or blocked low-priority RCU readers from indefinitely 
> > stalling RCU grace periods.
> 
> thanks - i've applied both patches to -rt and it's looking good so far! 
> Find a small cosmetic fix below.

Sorry for the %d noise!  :-/

I will send another patch addressing Nigel's freeze_processes()
review comments.

						Thanx, Paul

> 	Ingo
> 
> Index: linux/kernel/rcupreempt.c
> ===================================================================
> --- linux.orig/kernel/rcupreempt.c
> +++ linux/kernel/rcupreempt.c
> @@ -489,7 +489,7 @@ void init_rcu_boost_late(void)
>  	rcu_boost_task = kthread_run(rcu_booster, NULL, "RCU Prio Booster");
>  	if (IS_ERR(rcu_boost_task)) {
>  		printk(KERN_ALERT
> -		       "Unable to create RCU Priority Booster, errno %d\n",
> +		       "Unable to create RCU Priority Booster, errno %ld\n",
>  		       -PTR_ERR(rcu_boost_task));
> 
>  		/*
-
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