linux-kernel - Re: [PATCH 00/11] [GIT PULL] more updates for the tag format

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Date:	Wed, 10 Jun 2009 11:21:07 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
cc:	Theodore Tso <tytso@....edu>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Hellwig <hch@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH 00/11] [GIT PULL] more updates for the tag format


On Wed, 10 Jun 2009, Mathieu Desnoyers wrote:
> > 
> > 
> > And then in the trace format, we could do:
> > 
> > 	<data:gfp:field>
> > 
> > And the 'data' will flag us to how to print the data.
> > 
> > For userland, there could be a file in:
> > 
> > 	/debug/tracing/events/data_types/gfp/format
> > 
> > That will show that format. Yes we duplicate some of the code, but it 
> > it would solve these types of issues.
> > 
> 
> It sounds a lot like the type tables LTTng is currently exporting
> through specific channels. One for the list of IRQ handlers, one listing
> softirqs, one for syscalls.... etc etc. The nice side of this approach
> is that it permits to deal with dynamic events that modify the table
> state while tracing is active, e.g. : loadling a module which adds an
> IRQ handlers.
> 
> This is planned to be used for enum description eventually.

Well, I wouldn't make it dependent on any class, just a generic type to 
add that any user could do. The types just need to be added before the 
events are registered.

-- Steve

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