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
next prev parent 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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