linux-kernel - Re: [patch] measurements, numbers about CONFIG_OPTIMIZE

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Message-ID: <20090109205812.GA24837@uranus.ravnborg.org>
Date:	Fri, 9 Jan 2009 21:58:13 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Richard Guenther <richard.guenther@...il.com>,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	Dirk Hohndel <hohndel@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	jim owens <jowens@...com>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	paulmck@...ux.vnet.ibm.com, Gregory Haskins <ghaskins@...ell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>,
	Peter Morreale <pmorreale@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>, jh@...e.cz
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y impact

> 
> And you do have to realize that Linux has been using gcc for a _loong_ 
> while. You can talk all you want about how "inline" is just a hint, but 
> the fact is, it didn't use to be. gcc people _made_ it so, and are having 
> a damn hard time admitting that it's causing problems.

The kernel has used:
# define inline         inline          __attribute__((always_inline))

For a looong time.

So anyone in the kernel when they said "inline" actually
said to gcc: if you have any possible way to do so inline this
sucker.

Now we have a config option that changes this so inline is only
a hint. gcc does not pay enough attention to the hint,
especially compared to the days where the hint was actually a command.

	Sam
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