linux-kernel - Re: [PATCH -tip, final] perf, x86: Add hw_watchdog_set

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Message-ID: <20110705145656.GA18116@elte.hu>
Date:	Tue, 5 Jul 2011 16:56:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	Don Zickus <dzickus@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip, final] perf, x86: Add hw_watchdog_set_attr() in a
 sake of nmi-watchdog on P4


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Tue, 2011-07-05 at 15:31 +0200, Ingo Molnar wrote:
> > So there's lots of options to fix/improve this more intelligently.
> 
> Sure, and I like the alternative encoding thing best, but doing 
> that will take time, in the meantime this patch, which is 
> relatively small (and easy to revert once we get something better 
> going) does fix a problem for those few unfortunate souls still 
> using P4 hardware.

Well, the BUS_CYCLES thing looks similarly straightforward and should 
result in an even simpler patch.

On P4 BUS_CYCLES would be able to co-exist with CPU_CYCLES so it will 
solve the P4 issue naturally as well.

Thanks,

	Ingo
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