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Message-ID: <84fc9c000901091132k4f5d71a3m8efe77f9b8889270@mail.gmail.com>
Date: Fri, 9 Jan 2009 20:32:56 +0100
From: "Richard Guenther" <richard.guenther@gmail.com>
To: "Andi Kleen" <andi@firstfloor.org>
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y impact
Cc: "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Matthew Wilcox" <matthew@wil.cx>,
       "Dirk Hohndel" <hohndel@infradead.org>,
       "H. Peter Anvin" <hpa@zytor.com>, "Ingo Molnar" <mingo@elte.hu>,
       "jim owens" <jowens@hp.com>, "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>,
       "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>, jh@suse.cz
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On Fri, Jan 9, 2009 at 8:40 PM, Andi Kleen <andi@firstfloor.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@firstfloor.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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