Re: [tip:x86/asm] x86/defconfig: Turn onCONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig

[Borislav Petkov]

On Sat, Jan 26, 2013 at 04:25:57AM -0800, tip-bot for Ma Ling wrote:
> During the same  time (269.410275674 seconds) IPC from Os is
> 0.37, O2 is 0.36, Os improved performance 2.7%.
> 
> Signed-off-by: Ma Ling <ling.ml@xxxxxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Link: http://lkml.kernel.org/r/1359123061-6139-1-git-send-email-ling.ma@xxxxxxxxxx
> [ So, this is a bit symbolic as most people don't use the defconfig,
>   but the measurements are useful nevertheless so let's commit this
>   if there are no objections. ]

What about

commit 3a55fb0d9fe8e2f4594329edd58c5fd6f35a99dd
Author: Kirill Smelkov <kirr@xxxxxxxxxx>
Date:   Fri Nov 2 15:41:01 2012 +0400

    Tell the world we gave up on pushing CC_OPTIMIZE_FOR_SIZE

?

Reportedly, -Os generates suboptimal code in certain cases and we advise
against it with this patch.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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