linux-kernel - Re: [PATCH RFC] sysrq,rcu: suppress RCU stall warnings while sysrq runs

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Date:	Fri, 25 Apr 2014 07:35:53 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	paulmck@...ux.vnet.ibm.com, Jiri Kosina <jkosina@...e.cz>,
	linux-kernel@...r.kernel.org, joern@...fs.org,
	peterz@...radead.org, Andrew Morton <akpm@...ux-foundation.org>,
	cxie@...hat.com, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH RFC] sysrq,rcu: suppress RCU stall warnings while sysrq
 runs

On Thu, 2014-04-24 at 09:04 -0400, Rik van Riel wrote:

> diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
> index 4c0a9b0..2ac3289 100644
> --- a/kernel/rcu/update.c
> +++ b/kernel/rcu/update.c
> @@ -320,6 +320,17 @@ int rcu_jiffies_till_stall_check(void)
>  	return till_stall_check * HZ + RCU_STALL_DELAY_DELTA;
>  }
>  
> +void rcu_sysrq_start(void)
> +{
> +	rcu_cpu_stall_suppress = 2;
> +}

Monster box folks seem to routinely kill that at boot, probably won't
want it coming back to life at the poke of a button.

-Mike

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