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

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Date:	Wed, 15 Nov 2006 11:50:10 +0100
From:	Andi Kleen <ak@...e.de>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Adrian Bunk <bunk@...sta.de>, Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stephen Hemminger <shemminger@...l.org>, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Komuro <komurojun-mbn@...ty.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...hat.com>,
	Ernst Herzberg <earny@...4u.de>,
	Len Brown <len.brown@...el.com>,
	Andre Noll <maan@...temlinux.org>, discuss@...-64.org,
	Prakash Punnoor <prakash@...noor.de>, phil.el@...adoo.fr,
	oprofile-list@...ts.sourceforge.net,
	Alex Romosan <romosan@...orax.lbl.gov>,
	Jens Axboe <jens.axboe@...cle.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: 2.6.19-rc5: known regressions (v3)


> On a working kernel on an Opteron, we have normally 4 directories 
> in /dev/oprofile :
> 
> # ls -ld /dev/oprofile/?
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/0
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/1
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/2
> drwxr-xr-x 1 root root 0 15. Nov 12:38 /dev/oprofile/3
> 
> With linux-2.6.19-rc5, the first one (0) is missing and we get 1,2,3

That's because 0 was never available. It is used by the NMI watchdog.
The new kernel doesn't give it to oprofile anymore.

> Maybe the 'bug' is in oprofile tools, that currently expect to find '0'

Yes, it's likely a user space issue.

-Andi

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