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

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Message-ID: <20110708124906.GD4303@elte.hu>
Date:	Fri, 8 Jul 2011 14:49:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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


* Cyrill Gorcunov <gorcunov@...il.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
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