Re: [PATCH 19/20 -v5] Trace irq disabled critical timings

[Mathieu Desnoyers]

* Peter Zijlstra (a.p.zijlstra@xxxxxxxxx) wrote:
> 
> On Wed, 2008-01-23 at 12:27 -0500, Frank Ch. Eigler wrote:
> > Hi -
> > 
> > On Wed, Jan 23, 2008 at 12:11:07PM -0500, Steven Rostedt wrote:
> > > This patch adds latency tracing for critical timings
> > > (how long interrupts are disabled for).
> > > [...]
> > 
> > Is there an opportunity here to share effort with latencytop, and
> > ideally to use markers as much as possible for these event hooks?
> 
> I'm still thinking latencytop should only record stack traces and do the
> rest in user-space. 
> 
> Also, the things the latency tracer and latecytop measure are quite
> different. the latency tracer measures how long a non-schedulable
> section is, latencytop measures how a task was scheduled away.

Hrm, if it's really the only thing latencytop is doing.. ever thought
about trying LTTng ? ;) A simple plugin could be written in lttv to
perform this kind of analysis.

Mathieu

> 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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