linux-kernel - Re: [RFC][PATCH 0/4] tracing: Add new hwlat

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Message-ID: <5539597F.1060805@bristot.me>
Date:	Thu, 23 Apr 2015 17:43:43 -0300
From:	Daniel Bristot de Oliveira <daniel@...stot.me>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Carsten Emde <C.Emde@...dl.org>,
	Daniel Wagner <wagi@...om.org>, Jon Masters <jcm@...hat.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: [RFC][PATCH 0/4] tracing: Add new hwlat_detector tracer



On 04/23/2015 05:21 PM, Thomas Gleixner wrote:
> I know of a SMI event counter which is available on newer CPUs and
> Intel promised to add a SMI cycle counter as well. I have no idea
> whether that one ever materialized. PeterZ should know.

The turbostat shows how many SMIs happened during a period. To do it, it
reads the 'MSR_SMI_COUNT' counter. The code's comment says this counter
is there since Nehalem.
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