linux-kernel - Re: [PATCH] x86, perfctr: remove unused func avail_to_resrv_perfctr

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Message-ID: <20091228095546.GA4884@lenovo>
Date:	Mon, 28 Dec 2009 12:55:46 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Naga Chumbalkar <nagananda.chumbalkar@...com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, oprofile-list@...ts.sf.net,
	tglx@...utronix.de
Subject: Re: [PATCH] x86, perfctr: remove unused func
	avail_to_resrv_perfctr_nmi()

On Mon, Dec 28, 2009 at 09:38:45AM +0100, Ingo Molnar wrote:
> 
> * Cyrill Gorcunov <gorcunov@...il.com> wrote:
> 
> > On Thu, Dec 24, 2009 at 01:54:47AM +0000, Naga Chumbalkar wrote:
> > > avail_to_resrv_perfctr_nmi() is neither EXPORT'd, nor used in the file.
> > > So remove it.
> > > 
> > > Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@...com>
> > > ---
> > >  arch/x86/include/asm/nmi.h             |    1 -
> > >  arch/x86/kernel/cpu/perfctr-watchdog.c |   11 -----------
> > >  2 files changed, 0 insertions(+), 12 deletions(-)
> > > 
> > 
> > Hi Naga, this looks good to me! Thanks.
> > 
> > Is there any plans to use this routine in future
> > so we shouldn't touch this snippet?
> 
> Not that i know of.

ok, then we could apply this patch I think, at least for
a while.

> 
> In fact we should transform/migrate the NMI watchdog driver by making it based 
> on a kernel-internal created perf event. (which is what the NMI watchdog 
> really is: a periodic NMI event occuring once per second and running a 
> callback function.)

Yes, this would be great. I'll try to find out some time for this
task, though no promises :) If someone get it done earlier I would
really appreciate.

> 
> That would give us NMI watchdog support on all future x86 CPUs, automatically 
> - without having to extend the arch/x86/kernel/cpu/perfctr-watchdog.c code for 
> it.
> 
> 	Ingo
> 
	-- Cyrill
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