linux-kernel - Re: [tip:x86/asm] x86/defconfig: Turn on CONFIG_CC_OPTIMIZE_FOR

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Message-ID: <bc2bf9ae-5e4b-47ba-bb3b-172cd6e124f4@email.android.com>
Date:	Sat, 26 Jan 2013 13:04:40 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Jan Beulich <jbeulich@...e.com>, ling.ml@...pay.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/asm] x86/defconfig: Turn on CONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig

We have discussed -Ok(ernel) with the gcc guys in earnest.  They are receptive but lack the round tuits.

Steven Rostedt <rostedt@...dmis.org> wrote:

>On Sat, 2013-01-26 at 11:43 -0800, Linus Torvalds wrote:
>
>> The problem, of course, is that most -O2 code generation is done
>> assuming hot loops that don't show much if any I$ issues. And the -Os
>> thing is done *purely* for size, not taking any performance into
>> account at all. There's no balanced middle ground, which is what _we_
>> would want.
>
>Gcc needs to implement a -Olinus
>
>;-)
>
>-- Steve

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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