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

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Message-ID: <84fc9c000901091132k4f5d71a3m8efe77f9b8889270@mail.gmail.com>
Date:	Fri, 9 Jan 2009 20:32:56 +0100
From:	"Richard Guenther" <richard.guenther@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"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 9, 2009 at 8:40 PM, Andi Kleen <andi@...stfloor.org> wrote:
> 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.

How about GCC bugzillas with testcases that we can fix and enter into the
testsuite to make sure future GCC versions won't regress?

Richard.
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