From: Steven Rostedt <rostedt@goodmis.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
Ingo Molnar <mingo@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Arjan van de Ven <arjan@linux.intel.com>,
Jan Beulich <jbeulich@suse.com>,
ling.ml@alipay.com, Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/asm] x86/defconfig: Turn on CONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig
Date: Sat, 26 Jan 2013 16:02:47 -0500 [thread overview]
Message-ID: <1359234167.17639.3.camel@gandalf.local.home> (raw)
In-Reply-To: <CA+55aFyskO6NMhgkwRNv4wXB=D97VS54_oZw0k_o4nQFso6p-Q@mail.gmail.com>
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
next prev parent reply other threads:[~2013-01-26 21:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-25 14:11 [PATCH] [x86]: Compiler Option Os is better on latest x86 ling.ma.program
2013-01-26 12:25 ` [tip:x86/asm] x86/defconfig: Turn on CONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig tip-bot for Ma Ling
2013-01-26 12:52 ` Borislav Petkov
2013-01-26 15:18 ` H. Peter Anvin
2013-01-26 15:42 ` Borislav Petkov
2013-01-26 19:43 ` Linus Torvalds
2013-01-26 21:02 ` Steven Rostedt [this message]
2013-01-26 21:04 ` H. Peter Anvin
2013-01-27 12:49 ` Ingo Molnar
2013-01-26 21:08 ` H. Peter Anvin
2013-01-28 17:15 ` [PATCH] [x86]: Compiler Option Os is better on latest x86 Valdis.Kletnieks
2013-01-29 8:12 ` Ingo Molnar
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