linux-kernel - Re: [PATCH 1/2] Always probe the NMI watchdog

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Message-ID: <20070625210647.GB15258@atjola.homenet>
Date:	Mon, 25 Jun 2007 23:06:47 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, eranian@....hp.com,
	mingo@...e.hu, linux-kernel@...r.kernel.org,
	levon@...ementarian.org, perfmon@...ali.hpl.hp.com,
	oprofile-list@...ts.sourceforge.net, wcohen@...hat.com
Subject: Re: [PATCH 1/2] Always probe the NMI watchdog

On 2007.06.25 21:36:17 +0200, Andi Kleen wrote:
> On Monday 25 June 2007 21:09, Andrew Morton wrote:
> > On Wed, 20 Jun 2007 20:34:48 +0200
> >
> > Bj__rn Steinbrink <B.Steinbrink@....de> wrote:
> > > The performance counter allocator relies on the nmi watchdog being
> > > probed, so we have to do that even if the watchdog is not enabled.
> >
> > So...  what's the status of this lot?
> >
> > I've just merged this patch and the second one:
> >
> > Subject: [PATCH 2/2] Reserve the right performance counter for the Intel
> > PerfMon NMI watchdog Message-ID: <20070620183551.GC3251@...ola.homenet>
> >
> > but there was no followup discussion afaict.
> >
> > Andi, Stephane: acks?
> 
> Yes, although I'm still a little uneasy about the always probe one.
> 
> > If acked, do we agree that this is 2.6.22 material?
> 
> The first (always probe) is probably .22 material, but needs more testing 
> first.

Hm, without the second, I expect OProfile to break when the watchdog is
enabled. Alternatively to the patch I sent, we could revert the change
that makes it use perfctr1 instead of perfctr0. Would you prefer that?

Björn
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