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

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Message-ID: <alpine.LFD.2.00.0811271115370.3325@localhost.localdomain>
Date:	Thu, 27 Nov 2008 11:29:10 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	eranian@...il.com
cc:	Andi Kleen <andi@...stfloor.org>, 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, 27 Nov 2008, stephane eranian wrote:
> > Lockless buffers are nasty, but it works in oprofile at least.
> >
> > Taking out NMis in the first version at least seems like a reasonable
> > solution. After all you can still use standard oprofile where they work
> > just fine.
> >
> 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.

We can limit the functionality here. Fail or disable the NMI watchdog
are both valid solutions.

Thanks,

	tglx
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