linux-kernel - Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)

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Date:	Thu, 16 Nov 2006 08:04:31 +0100
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Linus Torvalds <torvalds@...l.org>, discuss@...-64.org,
	William Cohen <wcohen@...hat.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Komuro <komurojun-mbn@...ty.com>,
	Ernst Herzberg <earny@...4u.de>,
	Andre Noll <maan@...temlinux.org>,
	oprofile-list@...ts.sourceforge.net,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-usb-devel@...ts.sourceforge.net, phil.el@...adoo.fr,
	Adrian Bunk <bunk@...sta.de>, Ingo Molnar <mingo@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Stephen Hemminger <shemminger@...l.org>,
	Prakash Punnoor <prakash@...noor.de>,
	Len Brown <len.brown@...el.com>,
	Alex Romosan <romosan@...orax.lbl.gov>, gregkh@...e.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>
Subject: Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)

On Thursday 16 November 2006 06:05, Andrew Morton wrote:
> On Thu, 16 Nov 2006 04:21:09 +0100
> Andi Kleen <ak@...e.de> wrote:
> 
> > > 
> > > If it's really true that oprofile is simply busted then that's a serious
> > > problem and we should find some way of unbusting it.  If that means just
> > > adding a dummy "0" entry which always returns zero or something like that,
> > > then fine.
> > 
> > That could be probably done.
> 
> I'm told that this is exactly what it was doing before it got changed.

Hmm, ok perhaps that can be arranged again.

The trouble is that I want to use this performance counter for
other purposes too, so we would run into trouble again 
if oprofile keeps stealing it.

> > > But we can't just go and bust it.
> > 
> > It just did something unbelievable broken before.
> 
> What did it do?

Silently kill the nmi watchdog.

> 
> > I would say it busted
> > itself.
> 
> It gave profiles, which was fairly handy.

I'm sure it can be fixed there. Ok ok I keep sounding like a sysfs maintainer
now @)

-Andi
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