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

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Date:	Fri, 9 Jan 2009 08:44:47 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	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>,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	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>
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y
 impact



On Fri, 9 Jan 2009, H. Peter Anvin wrote:
> As far as naming is concerned, gcc effectively supports four levels,
> which *currently* map onto macros as follows:
> 
> __always_inline		Inline unconditionally
> inline			Inlining hint
> <nothing>		Standard heuristics
> noinline		Uninline unconditionally
> 
> A lot of noise is being made about the naming of the levels

The biggest problem is the <nothing>. 

The standard heuristics for that are broken, in particular for the "single 
call-site static function" case.

If gcc only inlined truly trivial functions for that case, I'd already be 
much happier. Size be damned.

			Linus
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