linux-kernel - Re: [PATCH] new irq tracer

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Message-ID: <20090218222316.GH24507@redhat.com>
Date:	Wed, 18 Feb 2009 17:23:16 -0500
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jason Baron <jbaron@...hat.com>, mingo@...e.hu,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, fweisbec@...il.com,
	compudj@...stal.dyndns.org
Subject: Re: [PATCH] new irq tracer

Hi -

On Wed, Feb 18, 2009 at 11:10:35PM +0100, Peter Zijlstra wrote:
> > > I really am having a difficult time seeing the use in such narrow
> > > tracers.
> > 
> > Part of the problem may come from defining "tracers" as something
> > limited to ftrace engines.  Once such tracepoints are in the kernel,
> > more powerful analytical tools may be attached to them.
> 
> ftrace graph tracer is by far the most powerful thing I've seen [...]

Be that as it may, what you suggested required separate correlation of
data with /proc/interrupts contents.


> What is limiting are these puny little tracers that have no real value.

Which limited resource would even puny tracers exhaust?


> A much better purpose for these tracepoints would be augmenting data in
> existing tracers like the graph/function/sched tracer.

Be more specific.  How would you augment those tracers with e.g.
individual irq numbers, their disposition status (HANDLED etc.).


- FChE
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