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

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Message-ID: <20090109194026.GM26290@one.firstfloor.org>
Date:	Fri, 9 Jan 2009 20:40:26 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Richard Guenther <richard.guenther@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	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

On Fri, Jan 09, 2009 at 08:10:20PM +0100, Richard Guenther wrote:
> On Fri, Jan 9, 2009 at 8:21 PM, Andi Kleen <andi@...stfloor.org> wrote:
> >> GCC 4.3 should be good in compiling the
> >> kernel with default -Os settings.
> >
> > It's unfortunately not. It doesn't inline a lot of simple asm() inlines
> > for example.
> 
> Reading Ingos posting with the actual numbers states the opposite.

Hugh had some numbers upto 4.4.0 20090102 in

http://thread.gmane.org/gmane.linux.kernel/775254/focus=777231

which demonstrated the problem.

-Andi

-- 
ak@...ux.intel.com
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