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

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Date:	Sat, 26 Jan 2013 16:02:47 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, 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

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


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