linux-kernel - Re: [PATCH][RFC] trace: profile likely and unlikely annotations

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Message-ID: <20081028074816.04193e04@infradead.org>
Date:	Tue, 28 Oct 2008 07:48:16 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Theodore Tso <tytso@....edu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mike Snitzer <snitzer@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH][RFC] trace: profile likely and unlikely annotations

On Tue, 28 Oct 2008 10:37:20 -0400
Theodore Tso <tytso@....edu> wrote:

> On Tue, Oct 28, 2008 at 12:12:48AM -0400, Steven Rostedt wrote:
> > 
> > Andrew Morton recently suggested having an in-kernel way to profile
> > likely and unlikely macros. This patch achieves that goal.
> 
> Maybe I'm confused, but when I read through the patch, it looks like
> that 'hit' is incremented whenever the condition is true, and 'missed'
> is incremented whenever the condition is false, correct?
> 
> Is that what you intended?  So for profile_unlikely, "missed" is good,
> and "hit" is bad, and for profile_likely, "hit" is good, and "missed"
> is bad.  That seems horribly confusing.
> 
> If that wasn't what you intended, the meaning of "hit" and "missed"
> seems to be highly confusing, either way.  Can we perhaps use some
> other terminology?  Simply using "True" and "False" would be better,
> since there's no possible confusion what the labels mean.

or "correct" and "incorrect"



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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