linux-kernel - Re: [PATCH 2/4] tracing: add event trace infrastructure

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Message-ID: <alpine.DEB.2.00.0902251107350.12697@gandalf.stny.rr.com>
Date:	Wed, 25 Feb 2009 11:09:28 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Pekka Paalanen <pq@....fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Martin Bligh <mbligh@...gle.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/4] tracing: add event trace infrastructure


On Wed, 25 Feb 2009, Ingo Molnar wrote:
> > Yeah, maybe that file (latency_trace) is a bit too much. I for 
> > one love it. It is great to load a kernel on some remote box, 
> > and run the irqs off latency tracer to see where the 
> > interrupts are disabled for the longest time. This format is 
> > really nice because it shows me when we are in an interrupt, 
> > or interrupts are disabled, and when the task should have been 
> > rescheduled.
> > 
> > This has help find places that we miss a preemption check too.
> 
> Could we get that, as PeterZ has suggested, as a trace_option 
> column in the 'trace' file? It would be default off for 
> non-latency tracers, with latency tracing plugins turning it on 
> by default. Would that work?

Sure, I'd be fine with it as an option. I just don't want to 
completely lose the ability to retrieve that information.

-- Steve

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