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

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Message-ID: <20090116160307.GA16612@elte.hu>
Date:	Fri, 16 Jan 2009 17:03:07 +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


* Ingo Molnar <mingo@...e.hu> 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.

We could build that hash when registering the tracer. Via recordmcount we 
have advance knowledge of all the functions that may be traced.

	Ingo
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