Return-Path: <linux-kernel-owner+w=401wt.eu-S1754327AbZAIQjS@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754327AbZAIQjS (ORCPT <rfc822;w@1wt.eu>);
	Fri, 9 Jan 2009 11:39:18 -0500
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752396AbZAIQi7
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Fri, 9 Jan 2009 11:38:59 -0500
Received: from terminus.zytor.com ([198.137.202.10]:46545 "EHLO
	terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752137AbZAIQi5 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 9 Jan 2009 11:38:57 -0500
Message-ID: <49677CB1.3030701@zytor.com>
Date: Fri, 09 Jan 2009 08:34:57 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
User-Agent: Thunderbird 2.0.0.14 (X11/20080501)
MIME-Version: 1.0
To: Ingo Molnar <mingo@elte.hu>
CC: jim owens <jowens@hp.com>, Linus Torvalds <torvalds@linux-foundation.org>,
       Chris Mason <chris.mason@oracle.com>,
       Peter Zijlstra <peterz@infradead.org>,
       Steven Rostedt <rostedt@goodmis.org>, paulmck@linux.vnet.ibm.com,
       Gregory Haskins <ghaskins@novell.com>, Matthew Wilcox <matthew@wil.cx>,
       Andi Kleen <andi@firstfloor.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-fsdevel <linux-fsdevel@vger.kernel.org>,
       linux-btrfs <linux-btrfs@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>, Nick Piggin <npiggin@suse.de>,
       Peter Morreale <pmorreale@novell.com>,
       Sven Dietrich <SDietrich@novell.com>
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y
 impact
References: <20090108141808.GC11629@elte.hu> <1231426014.11687.456.camel@twins> <alpine.LFD.2.00.0901080849550.3283@localhost.localdomain> <1231434515.14304.27.camel@think.oraclecorp.com> <alpine.LFD.2.00.0901080955400.3283@localhost.localdomain> <20090108183306.GA22916@elte.hu> <496648C7.5050700@zytor.com> <alpine.LFD.2.00.0901081943150.6528@localhost.localdomain> <20090109130057.GA31845@elte.hu> <49675920.4050205@hp.com> <20090109153508.GA4671@elte.hu>
In-Reply-To: <20090109153508.GA4671@elte.hu>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 1247
Lines: 33

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.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/