linux-kernel - Re: [PATCH 0/2] ftrace: updates to tip

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Message-ID: <20090116163021.GA27495@elte.hu>
Date:	Fri, 16 Jan 2009 17:30:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH 0/2] ftrace: updates to tip


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Fri, 16 Jan 2009, Ingo Molnar wrote:
> > * Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > > [...] We can register a function to be traced via the function pointer, 
> > > and we can pick which functions to trace, but we can not separate out 
> > > different functions for different traces.
> > 
> > Why not? We could have a hash of all traced functions with metadata 
> > attached. Since patching functions in/out would be a relatively rare 
> > operation, this would be a highly efficient read-mostly hash.
> 
> I was afraid you would say that :-)
> 
> Yes, we could add something to do this. It would take some thought on a 
> good api, and implementation. This is not an easy task by any means. We 
> need a way to map between a function call and a tracer, where a function 
> call can call more than one tracer.

Note that some other things could be consolidated under per function 
metadata: for example set_graph_function - which really is a per function 
attribute too. Plus a lot of new things would be enabled i think.

	Ingo
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