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

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Message-ID: <20090117223451.GA27065@elte.hu>
Date:	Sat, 17 Jan 2009 23:34:51 +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:

> > 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?

	Ingo
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