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Date: Fri, 17 Nov 2006 02:13:57 -0800
From: Andrew Morton <akpm@osdl.org>
To: Mikael Pettersson <mikpe@it.uu.se>
Cc: ebiederm@xmission.com (Eric W. Biederman), Andi Kleen <ak@suse.de>,
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Subject: Re: [discuss] Re: 2.6.19-rc5: known regressions (v3)
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On Fri, 17 Nov 2006 10:59:07 +0100
Mikael Pettersson <mikpe@it.uu.se> wrote:

> Andrew Morton writes:
>  > On Thu, 16 Nov 2006 11:55:46 +0100
>  > Mikael Pettersson <mikpe@it.uu.se> wrote:
>  > 
>  > > Andrew Morton writes:
>  > >  > Surely the appropriate behaviour is to allow oprofile to steal the NMI and
>  > >  > to then put the NMI back to doing the watchdog thing after oprofile has
>  > >  > finished with it.
>  > > 
>  > > Which is _exactly_ what pre-2.6.19-rc1 kernels did. I implemented
>  > > the in-kernel API allowing real performance counter drivers like
>  > > oprofile (and perfctr) to claim the HW from the NMI watchdog,
>  > > do their work, and then release it which resumed the watchdog.
>  > 
>  > OK.  But from Andi's comments it seems that the NMI watchdog was failing to
>  > resume its operation.
> 
> It certainly worked when I originally implemented it. If it didn't work
> that way before 2.6.19-rc1 butchered it then that would have been a bug
> that should have been fixed.

Oh.  OK.

Meanwhile, 2.6.19-rc6 remains unfixed.

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