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

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Message-ID: <20130912194833.GW8742@dangermouse.emea.sgi.com>
Date:	Thu, 12 Sep 2013 20:48:33 +0100
From:	Hedi Berriche <hedi@....com>
To:	Mike Travis <travis@....com>
Cc:	paulmck@...ux.vnet.ibm.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 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.

Cheers,
Hedi.
-- 
Be careful of reading health books, you might die of a misprint.
	-- Mark Twain
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