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From: Arjan van de Ven <arjan@infradead.org>
To: Theodore Tso <tytso@mit.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Mike Snitzer <snitzer@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH][RFC] trace: profile likely and unlikely annotations
Date: Tue, 28 Oct 2008 07:48:16 -0700	[thread overview]
Message-ID: <20081028074816.04193e04@infradead.org> (raw)
In-Reply-To: <20081028143720.GD8869@mit.edu>

On Tue, 28 Oct 2008 10:37:20 -0400
Theodore Tso <tytso@mit.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
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org

  reply	other threads:[~2008-10-28 14:48 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-27 22:29 why unlikely(rsv) in ext3_clear_inode()? Mike Snitzer
2008-10-27 22:53 ` Steven Rostedt
2008-10-27 23:32 ` Steven Rostedt
2008-10-27 23:48   ` Andrew Morton
2008-10-28  0:13   ` Theodore Tso
2008-10-28  0:21     ` Steven Rostedt
2008-10-28  4:12     ` [PATCH][RFC] trace: profile likely and unlikely annotations Steven Rostedt
2008-10-28  4:23       ` Arjan van de Ven
2008-10-28  4:39       ` Andrew Morton
2008-10-28 14:37       ` Theodore Tso
2008-10-28 14:48         ` Arjan van de Ven [this message]
2008-10-28 14:51           ` Steven Rostedt
2008-10-29 16:35             ` [PATCH 1/2 v2][RFC] " Steven Rostedt
2008-10-29 16:38               ` [PATCH 2/2 v2][RFC] ftrace: unlikely annotation tracer Steven Rostedt
2008-10-29 16:40               ` [PATCH 1/2 v2][RFC] trace: profile likely and unlikely annotations Arjan van de Ven
2008-10-29 22:39               ` [PATCH 1/2 v3][RFC] " Steven Rostedt
2008-10-29 22:40                 ` [PATCH 2/2 v3][RFC] ftrace: unlikely annotation tracer Steven Rostedt
2008-10-30 14:32                 ` [PATCH 1/2 v3][RFC] trace: profile likely and unlikely annotations Jörn Engel
2008-10-30 14:55                   ` Theodore Tso
2008-10-30 15:10                     ` Steven Rostedt
2008-10-28 14:49         ` [PATCH][RFC] " Steven Rostedt
2008-10-28 18:29           ` Theodore Tso
2008-10-28 18:41             ` Steven Rostedt
2008-10-28  0:14   ` why unlikely(rsv) in ext3_clear_inode()? Mike Snitzer
2008-10-27 23:52 ` Mingming Cao
2008-10-28  0:09   ` Mike Snitzer

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