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

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Message-Id: <200611151945.31535.ak@suse.de>
Date:	Wed, 15 Nov 2006 19:45:30 +0100
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	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>,
	Linus Torvalds <torvalds@...l.org>, 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 Wednesday 15 November 2006 19:39, Andrew Morton wrote:
> On Wed, 15 Nov 2006 17:48:05 +0100
> Andi Kleen <ak@...e.de> wrote:
> 
> > 
> > > OProfile has a simplistic view of the performance monitoring hardware. The 
> > > routines in libop/op_alloc_counter.c determine what set of performance registers 
> > > is available from the processor in use. There is no check to see what registers 
> > > are actually available in the /dev/oprofile directory.
> > > 
> > > opcontrol executes ophelp to determine which specific counters to count which 
> > > events. The function map_event_to_counter() in libop/op_alloc_counter.c does the 
> > > actual selection. It seems what is needed is for map_event_to_counter() to check 
> > > to see which counters are available and mark the others as unavailable
> > 
> > Thanks for the explanation. Can you please fix it and release a new version? 
> > Documentation/Changes could be adapted then.
> > 
> 
> Meanwhile we should restore the NMI counter to fix this bug.

No, it was always oprofile who was buggy here, silently taking 
the nmi watchdog away.

-Andi
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