linux-kernel - Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

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Message-ID: <20130912201717.GX3966@linux.vnet.ibm.com>
Date:	Thu, 12 Sep 2013 13:17:17 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Travis <travis@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jason Wessel <jason.wessel@...driver.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dimitri Sivanich <sivanich@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

On Thu, Sep 12, 2013 at 08:48:33PM +0100, Hedi Berriche wrote:
> On Thu, Sep 12, 2013 at 19:59 Mike Travis wrote:
> | On 9/12/2013 10:27 AM, Paul E. McKenney wrote:
> |
> | > But what is it that you are looking for?  If you want to silence it
> | > completely, the rcu_cpu_stall_suppress boot/sysfs parameter is what
> | > you want to use.
> | 
> | We have by default rcutree.rcu_cpu_stall_suppress=1 on the kernel
> | cmdline.  I'll double check if it was set during my testing.
> 
> FWIW, for recent enough kernels the correct boot parameter is
> rcupdate.rcu_cpu_stall_suppress.
> 
> It used to be rcutree.rcu_cpu_stall_suppress, but that has changed after
> commit 6bfc09e.

Good point, Hedi!  That change happened when rcutiny gained RCU CPU
stall warning capability.

							Thanx, Paul

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