linux-kernel - Re: PATCH][RFC][resend] CC_OPTIMIZE_FOR

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Date:	Tue, 22 Mar 2011 09:25:56 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Pekka Enberg <penberg@...nel.org>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Eric Paris <eparis@...hat.com>,
	Roman Zippel <zippel@...ux-m68k.org>,
	linux-kbuild@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: PATCH][RFC][resend] CC_OPTIMIZE_FOR_SIZE should default to N

On Tue, 22 Mar 2011, Pekka Enberg wrote:

> Hi Jesper,
> 
> On Mon, Mar 21, 2011 at 10:08 PM, Jesper Juhl <jj@...osbits.net> wrote:
> > I believe that the majority of systems we are built on want a -O2 compiled
> > kernel. Optimizing for size (-Os) is mainly benneficial for embedded
> > systems and systems with very small CPU caches (correct me if I'm wrong).
> 
> Please take a look at commit 0910b44 ("Expose "Optimize for size"
> option for everybody") for the reasoning behind defaulting to -Os.
> 
Thank you for that pointer Pekka. I guess I need to update my view on -Os.

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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