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

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Message-ID: <49677CB1.3030701@zytor.com>
Date:	Fri, 09 Jan 2009 08:34:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	jim owens <jowens@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

Ingo Molnar wrote:
> 
> My goal is to make the kernel smaller and faster, and as far as the 
> placement of 'inline' keywords goes, i dont have too strong feelings about 
> how it's achieved: they have a certain level of documentation value 
> [signalling that a function is _intended_ to be lightweight] but otherwise 
> they are pretty neutral attributes to me.
> 

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 (and I
personally believe we should have a different annotation for "inline
unconditionally for correctness" and "inline unconditionally for
performance", as a documentation issue), but those are the four we get.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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