linux-kernel - Re: [patch] measurements, numbers about CONFIG_OPTIMIZE

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Message-ID: <20090109180213.GH26290@one.firstfloor.org>
Date:	Fri, 9 Jan 2009 19:02:13 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Dirk Hohndel <hohndel@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Matthew Wilcox <matthew@....cx>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	jim owens <jowens@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	paulmck@...ux.vnet.ibm.com, Gregory Haskins <ghaskins@...ell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>,
	Peter Morreale <pmorreale@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>, jh@...e.cz
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y impact

> I think that's the point. gcc will not get it right. 

I don't think that's necessary an universal truth. It 
can be probably fixed.

> So we need to do it ourselves in the kernel sources.
> We may not like it, but it's the only way to guarantee reproducable
> reliable inline / noinline decisions.

For most things we don't really need it to be reproducable,
the main exception are the inlines in headers.

Universal noinline would also be a bad idea because of its
costs (4.1% text size increase). Perhaps should make it
a CONFIG option for debugging though.

-Andi



> 
> /D
> 
> -- 
> Dirk Hohndel
> Intel Open Source Technology Center
> 

-- 
ak@...ux.intel.com
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