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From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>,
	linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Clark Williams <williams@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jon Masters <jcm@redhat.com>, Daniel Wagner <wagi@monom.org>,
	Carsten Emde <C.Emde@osadl.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC][PATCH 5/3] tracing: Add smi counting to HWLAT
Date: Tue, 9 Aug 2016 15:28:57 -0300	[thread overview]
Message-ID: <81075ecf-90c3-fdb2-59eb-defd215af2eb@redhat.com> (raw)
In-Reply-To: <20160809140543.2e5c83b5@gandalf.local.home>

On 08/09/2016 03:05 PM, Steven Rostedt wrote:
> If an arch supports counting of SMIs (like newer intel chips do), then it
> can implement arch_smi_count() to return the number of SMIs that were
> triggered. The hwlat detector will call this function to get the current
> number of SMIs, and then after a period, it will read that function again,
> and if there's a difference, it will record that into the sample.
> 
> For example:
> 
>  [99] inner:13 outer:16 ts:1470352534.886878855
>  [100] inner:14 outer:18747 ts:1470352538.917966818 smi-count:2
>  [101] inner:0 outer:19162 ts:1470352539.920988709 smi-count:6
>  [102] inner:19376 outer:19276 ts:1470352540.923010578 smi-count:6
>  [103] inner:19650 outer:20665 ts:1470352541.926032469 smi-count:6
>  [104] inner:20526 outer:20680 ts:1470352542.973055312 smi-count:6
>  [105] inner:17 outer:17 ts:1470352543.990077507
> 
> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

It worked fine in a system that I can manually cause SMIs (by turning
keyboard's backlight on and off).

Tested-by: Daniel Bristot de Oliveira <bristot@redhat.com>

-- Daniel

  reply	other threads:[~2016-08-09 18:29 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-04 14:57 [RFC][PATCH 0/3] tracing: Add Hardware Latency detector tracer Steven Rostedt
2016-08-04 14:57 ` [RFC][PATCH 1/3] tracing: Added hardware latency tracer Steven Rostedt
2016-08-05 14:25   ` Sebastian Andrzej Siewior
2016-08-05 14:44     ` Steven Rostedt
2016-08-05 15:28       ` Sebastian Andrzej Siewior
2016-08-05 15:36         ` Steven Rostedt
2016-08-04 14:57 ` [RFC][PATCH 2/3] tracing: Add documentation for hwlat_detector tracer Steven Rostedt
2016-08-10 14:12   ` Jon Masters
2016-08-04 14:57 ` [RFC][PATCH 3/3] tracing: Have hwlat trace migrate across tracing_cpumask CPUs Steven Rostedt
2016-08-04 15:30 ` [RFC][PATCH 0/3] tracing: Add Hardware Latency detector tracer Steven Rostedt
2016-08-09 18:15   ` Clark Williams
2016-08-09 18:30     ` Steven Rostedt
2016-08-04 16:56 ` [RFC][PATCH 4/3] tracing: Add NMI tracing in hwlat detector Steven Rostedt
2016-08-04 17:16   ` Steven Rostedt
2016-08-05 14:35     ` Sebastian Andrzej Siewior
2016-08-05 14:52       ` Steven Rostedt
2016-08-05 15:40         ` Sebastian Andrzej Siewior
2016-08-05 16:17           ` Steven Rostedt
2016-08-09 17:22           ` Steven Rostedt
2016-08-10 14:10         ` Jon Masters
2016-08-09 18:05 ` [RFC][PATCH 5/3] tracing: Add smi counting to HWLAT Steven Rostedt
2016-08-09 18:28   ` Daniel Bristot de Oliveira [this message]
2016-08-09 18:35     ` Steven Rostedt
2016-08-09 21:25   ` Peter Zijlstra

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