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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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