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Date:	Sat, 26 Jan 2013 13:04:40 -0800
From:	"H. Peter Anvin" <>
To:	Steven Rostedt <>,
	Linus Torvalds <>
CC:	Borislav Petkov <>, Ingo Molnar <>,
	Linux Kernel Mailing List <>,
	Arjan van de Ven <>,
	Jan Beulich <>,,
	Andrew Morton <>,
	Thomas Gleixner <>,
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 <> 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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