linux-kernel - Re: [RFC][PATCH] rcu: Hotplug and PROVE_RCU

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Date:	Mon, 03 Jun 2013 14:19:51 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] rcu: Hotplug and PROVE_RCU_DELAY not playing well
 together

On Sun, 2013-06-02 at 07:18 -0700, Paul E. McKenney wrote:

> ------------------------------------------------------------------------
> 
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index d12470e..9a08bdc 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1320,9 +1320,9 @@ static int rcu_gp_init(struct rcu_state *rsp)
>  					    rnp->grphi, rnp->qsmask);
>  		raw_spin_unlock_irq(&rnp->lock);
>  #ifdef CONFIG_PROVE_RCU_DELAY
> -		if ((prandom_u32() % (rcu_num_nodes * 8)) == 0 &&
> +		if ((prandom_u32() % (rcu_num_nodes + 1)) == 0 &&
>  		    system_state == SYSTEM_RUNNING)
> -			schedule_timeout_uninterruptible(2);
> +			udelay(200);
>  #endif /* #ifdef CONFIG_PROVE_RCU_DELAY */
>  		cond_resched();
>  	}

I ran this for a bit. Where it usually crashes in less than a minute,
this ran for over 10 minutes without issue.

Tested-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve


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