linux-kernel - Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

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Message-ID: <20081107164757.GS29626@one.firstfloor.org>
Date:	Fri, 7 Nov 2008 17:47:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Robert Richter <robert.richter@....com>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: linux-2.6.28-rc2 regression : oprofile doesnt work anymore ?

On Fri, Nov 07, 2008 at 05:12:33PM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> >On Fri, Nov 07, 2008 at 04:13:42PM +0100, Eric Dumazet wrote:
> >>Andi Kleen a écrit :
> >>>Can you please test this patch and see if it solves the problem?
> >>>
> >>>Thanks,
> >>>-Andi
> >>>
> >>>---
> >>>
> >>>oprofile: Fix p6 counter overflow check
> >>>
> >>>Fix the counter overflow check for CPUs with counter width > 32
> >>>
> >>>I had a similar change in a different patch that I didn't submit
> >>>and I didn't notice the problem earlier because it was always
> >>>tested together.
> >>>
> >>>Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> >>>
> >>Thanks Andi
> >>
> >>Unfortunatly, there is still a freeze of NMIS after a while.
> >
> >How long is the while?
> >
> 
> Less than 20 seconds if fully loaded with "tbench 8" on my 8 cpus machine.

I don't have tbench on the test box, but when I load it with a couple
of while true ; do true ; done loops it also continues sampling.

Are you sure it worked in 2.6.27?

-Andi
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