linux-kernel - Re: introduce NMI_AUTO as nmi

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Message-ID: <1263388422.4244.214.camel@laptop>
Date:	Wed, 13 Jan 2010 14:13:42 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Don Zickus <dzickus@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>, aris@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: introduce NMI_AUTO as nmi_watchdog option

On Wed, 2010-01-13 at 10:32 +0100, Ingo Molnar wrote:
> other architectures have NMI concepts as well, such as Sparc64. 

I think both sparc64 and ppc64 fake NMIs by playing games with hw IRQ
priorities and partial masks. But yes.

One interesting 'feature' for the perf-nmi interaction is creating an
idle scheduling class for counters, because as long as there is a
counter present you can use his NMIs to drive the watchdog, but as soon
as there are non left, you need to install one.

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