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

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Message-ID: <20090118072753.GA3398@elte.hu>
Date:	Sun, 18 Jan 2009 08:27:53 +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:

> 
> * Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > > This would allow the creation of "surgical" one-time traces - of 
> > > events and functions one is specifically interested in.
> > 
> > This all sounds great, but it would add a lot of conditionals into a 
> > extremely hot function tracer path. [...]
> 
> Why would we need more than exactly one unlikely() condition to handle 
> all of this?

We could even do it with zero branches, burdening none of the hotpaths of 
existing functionality. Hm?

	Ingo
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