linux-kernel - Re: [RFC] The New and Improved Logdev (now with kprobes!)

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Message-ID: <20061006012936.GA19300@Krystal>
Date:	Thu, 5 Oct 2006 21:29:37 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Karim Yaghmour <karim@...rsys.com>,
	Andrew Morton <akpm@...l.org>,
	Chris Wright <chrisw@...s-sol.org>, fche@...hat.com,
	Tom Zanussi <zanussi@...ibm.com>
Subject: Re: [RFC] The New and Improved Logdev (now with kprobes!)

* Steven Rostedt (rostedt@...dmis.org) wrote:
 >
> > Please don't :) Defining a new event would be to say :
> >
> > I want to create an event named "schedchange", which belongs to the "kernel"
> > subsystem. In its definition, I say that it will take two integers and a long,
> > respectively names "prev_pid", "next_pid" and "state".
> >
> > We can think of various events for various subsystems, and even for modules. It
> > becomes interesting to have dynamically loadable event definitions which gets
> > loaded with kernel modules. The "description" of the events is saved in the
> > trace, in a special low traffic channel (small buffers with a separate file).
> >
> 
> But these events still need the marker in the source code right?
> 

Yes, but not necessarily. But it could also be a kernel module built
on-the-fly by a generator like SystemTAP which defines new events.

> 
> That should definitely be a step. If I'm understanding this (which I may
> not be), you can have a dynamic event added with also using dynamic
> trace points like kprobes.
> 

Yes, we could use a kprobes based approach with only one data type (string is
always a good example), but we could also define one specific event and its
associates data types for each probes.


> No prob, I should read the rest of the thread, and try to catch up more,
> before posting more comments.
> 

No problem, constructive comments and ideas are always welcome.


Mathieu

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