linux-kernel - Re: [patch 05/24] perfmon: X86 generic code (x86)

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Message-Id: <1227786746.4454.1468.camel@twins>
Date:	Thu, 27 Nov 2008 12:52:26 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	eranian@...il.com
Cc:	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, x86@...nel.org, sfr@...b.auug.org.au
Subject: Re: [patch 05/24] perfmon: X86 generic code (x86)

On Thu, 2008-11-27 at 12:35 +0100, stephane eranian wrote:
> On Thu, Nov 27, 2008 at 12:31 PM, Andi Kleen <andi@...stfloor.org> wrote:
> >> The only reason why I have to deal with NMI is not so much to allow
> >> for profiling irq-off regions but because I have to share the PMU with
> >> the NMI watchdog. Otherwise I'd have to fail  or disable the NMI watchdog
> >> on the fly.
> >
> > The NMI watchdog is now off by default so failing with it enabled
> > is fine.
> 
> Yes, but most likely it is on in distro kernels.

So? You can disable it on the fly when there is a perfmon user.
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