linux-kernel - Re: [PATCH RT] Add histograms of potential and effective wakeup latencies

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Date:	Mon, 14 Sep 2009 21:01:12 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Carsten Emde <Carsten.Emde@...dl.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	RT-Users <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH RT] Add histograms of potential and effective wakeup
 latencies

On Tue, 2009-09-15 at 02:20 +0200, Carsten Emde wrote:
> Resuscitated and enhanced the kernel latency histograms provided
> originally by Yi Yang and adapted and converted by Steven Rostedt.
> 
> Latency histograms in the current version
> - can be enabled online and independently
> - have virtually no performance penalty when configured but not enabled
> - have very little performance penalty when enabled
> - use already available wakeup and switch tracepoints
> - give corresponding results with the related tracer
> - allow to record wakeup latency histograms of a single process
> - record the process where the highest wakeup latency occurred 
> - are documented in Documentation/trace/histograms.txt
> 
> Signed-off-by: Carsten Emde <C.Emde@...dl.org>

I did a quick scan of the patch and this looks much nicer.

Good work!

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve


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