linux-kernel - Re: [PATCH RT] hwlat_detector: Check the outer side of the loop

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Date:	Wed, 12 Sep 2012 10:57:28 -0400
From:	Jon Masters <jcm@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Darren Hart <dvhart@...ux.intel.com>,
	Clark Williams <clark@...hat.com>
Subject: Re: [PATCH RT] hwlat_detector: Check the outer side of the loop

On 09/12/2012 10:34 AM, Steven Rostedt wrote:
> The hwlat_detector performs the following test:
>
> 	t1 = ktime_get();
> 	t2 = ktime_get();
>
> 	[ do the checks of t2 - t1 ]
>
> It can detect things like SMIs if it occurs between the t1 and t2
> timestamps, as there will be a large difference between the two.

Oops. Good catch.

Jon.

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