linux-kernel - Re: [PATCH 2/8] [nmi watchdog] touch_softlockup cleanups and softlockup

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Date:	Wed, 12 May 2010 17:50:15 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>, mingo@...e.hu,
	peterz@...radead.org, aris@...hat.com,
	linux-kernel@...r.kernel.org, randy.dunlap@...cle.com
Subject: Re: [PATCH 2/8] [nmi watchdog] touch_softlockup cleanups and
 softlockup_tick removal

On Thu, May 13, 2010 at 01:38:14AM +0400, Cyrill Gorcunov wrote:
> On Wed, May 12, 2010 at 11:00:36PM +0200, Frederic Weisbecker wrote:
> ...
> > > > 
> > > > Ah right.
> > > > 
> > > > BTW, if you address my reviews, please do it incrementally, I'm going
> > > > to apply this set and push it to Ingo.
> > > 
> > > Ok, probably easier to review too. :-)
> > 
> > 
> > Yeah, and it's time to flush this code as it's good globally.
> > 
> > Plus it would be nice to get this for .35
> > 
> > Ah and forget about the sysctl ABI breakages. Since this is only
> > used for kernel development, this is not going to break much things.
> > If somebody complains, we can still reintegrate what we had.
> > 
> > Thanks.
> > 
> ...
> Guys, could you please spend a few minutes and enlighten me a bit?
> Does all this series mean that we eventually will drop nmi-watchdog
> via io-apic (read via pic) as only the transition to perf complete?
> 
> I recall someone said about to stop using io-apic, but just to be sure.

Right, this code sits on top of the perf subsystem which uses lapic.
Eventually, the old nmi watchdog code will disappear along with the
support for io-apic.

Cheers,
Don
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