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

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Message-ID: <20081127113115.GH6703@one.firstfloor.org>
Date:	Thu, 27 Nov 2008 12:31:15 +0100
From:	Andi Kleen <andi@...stfloor.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)

> 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.

Longer term having NMI profiling is still a useful feature I think,
but of course it needs to be implemented cleanly.

-Andi

-- 
ak@...ux.intel.com
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