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Date: Fri, 8 Jul 2011 14:49:06 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Don Zickus <dzickus@redhat.com>,
        Stephane Eranian <eranian@google.com>, Lin Ming <ming.m.lin@intel.com>,
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        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -tip, final] perf, x86: Add hw_watchdog_set_attr() in a
 sake of nmi-watchdog on P4
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* Cyrill Gorcunov <gorcunov@gmail.com> wrote:

> > On P4 BUS_CYCLES would be able to co-exist with CPU_CYCLES so it 
> > will solve the P4 issue naturally as well.
> 
> i don't think it changes much, Ingo, if I change it to bus cycles I 
> still will have to setup nmi-watchdog event separately (but simply 
> with bus event).

You did not understand my point, my suggestion is to change this in 
kernel/watchdog.c:

static struct perf_event_attr wd_hw_attr = {
        .type           = PERF_TYPE_HARDWARE,
        .config         = PERF_COUNT_HW_CPU_CYCLES,

to:

static struct perf_event_attr wd_hw_attr = {
        .type           = PERF_TYPE_HARDWARE,
        .config         = PERF_COUNT_HW_BUS_CYCLES,

Thanks,

	Ingo