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

[Steven Rostedt <rostedt@goodmis.org>]

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@osadl.org>

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

Good work!

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

-- Steve