linux-kernel - Re: [PATCH 4/4] perf, x86: Add PERF_COUNT_HW_NMI

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Message-ID: <20110422081838.GA24011@elte.hu>
Date:	Fri, 22 Apr 2011 10:18:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Don Zickus <dzickus@...hat.com>
Cc:	x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 4/4] perf, x86: Add PERF_COUNT_HW_NMI_WATCHDOG event


* Don Zickus <dzickus@...hat.com> wrote:

> From: Cyrill Gorcunov <gorcunov@...il.com>
> 
> Due to restriction and specifics of Netburst PMU we need
> a separated event for NMI watchdog. Note that on all other
> than P4 PMU cpus this event is a simple alias for PERF_COUNT_HW_CPU_CYCLES.
> 
> This event is only used by x86 for now so no other archs involved.

hm, there's no explanation exactly why this is needed and what the alternatives 
are.

This sentence:

> +  /* we use that named non-sleeping calls */

does not parse for me.

Thanks,

	Ingo
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