From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clark Williams <williams@redhat.com>
Subject: Re: [RFC][PATCH 0/3] tracing: Add Hardware Latency detector tracer
Date: Tue, 9 Aug 2016 13:15:16 -0500
Message-ID: <20160809131516.6a83e93e@sluggy.hsv.redhat.com>
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	<20160804113033.78132a93@gandalf.local.home>
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Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
	Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
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To: Steven Rostedt <rostedt@goodmis.org>,
	Carsten Emde <C.Emde@osadl.org>
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On Thu, 4 Aug 2016 11:30:33 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> Note, I'm currently working on adding code to detect NMIs to this as
> well. And perhaps even tracing SMI counters. Just to show what caused
> the latency, as latency isn't measured by the counters (that I know of).
>=20

I like the trace report, but for one small thing; I think it's worth either=
 adding units to the reported latency values (us suffix) or putting in a he=
ader line that hwlatdetect values are reported in microseconds.

>    <...>-2644  [001] d...   202.735708: [99] inner:13 outer:16 ts:1470352=
534.886878855
>    <...>-2644  [001] d...   206.767274: [100] inner:14 outer:18747 ts:147=
0352538.917966818 smi-total:2
>    <...>-2644  [002] d...   207.775164: [101] inner:0 outer:19162 ts:1470=
352539.920988709 smi-total:6
>    <...>-2644  [003] d...   208.783067: [102] inner:19376 outer:19276 ts:=
1470352540.923010578 smi-total:6
>    <...>-2644  [000] d...   209.827416: [103] inner:19650 outer:20665 ts:=
1470352541.926032469 smi-total:6
>    <...>-2644  [001] d...   210.831062: [104] inner:20526 outer:20680 ts:=
1470352542.973055312 smi-total:6

Clark

--=20
The United States Coast Guard:
Ruining natural selection since 1790

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