linux-kernel - Re: [PATCH 4/4] trace: profile all if conditionals

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Message-ID: <alpine.DEB.1.10.0811211832460.7797@gandalf.stny.rr.com>
Date:	Fri, 21 Nov 2008 18:33:52 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	peterz@...radead.org, tytso@....edu, arjan@...radead.org,
	srostedt@...hat.com
Subject: Re: [PATCH 4/4] trace: profile all if conditionals


On Fri, 21 Nov 2008, Andrew Morton wrote:
> >
> > +#define if(cond) if (__builtin_constant_p((cond)) ? !!(cond) :		\
> 
> wheee...
> 
> Now how are you going to profile ?:, while, for(;expr;), etc? ;)

I don't know. Give me a few months, I'll figure out a way ;-)

This is just a way to see if we should add or remove more if annotations.

 (i.e. likely() and unlikey() )

-- Steve

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