linux-kernel - Re: [PATCH 1/2 v3][RFC] trace: profile likely and unlikely annotations

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Message-ID: <20081030143238.GB7157@logfs.org>
Date:	Thu, 30 Oct 2008 15:32:39 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Theodore Tso <tytso@....edu>, 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>,
	Daniel Walker <dwalker@...sta.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/2 v3][RFC] trace: profile likely and unlikely annotations

On Wed, 29 October 2008 18:39:55 -0400, Steven Rostedt wrote:
>
>    69768    61064  87 __switch_to                    process_64.c         624
>    15557   115251 100 __switch_to                    process_64.c         594
>    15555   115227 100 __switch_to                    process_64.c         590

I may be out of school for a while, but that math sure looks odd.

> +	if (p->correct) {
> +		percent = p->incorrect * 100;
> +		percent /= p->correct;
                percent /= p->correct + p->incorect;
> +		/* No need to see huge numbers */
> +		if (percent > 100)
> +			percent = 100;
> +	} else
> +		percent = p->incorrect ? 100 : 0;

Jörn

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