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

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Message-ID: <20090109084728.2c1d68a6@infradead.org>
Date:	Fri, 9 Jan 2009 08:47:28 -0800
From:	Dirk Hohndel <hohndel@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	jim owens <jowens@...com>,
	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>,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	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>
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y
 impact

On Fri, 9 Jan 2009 08:44:47 -0800 (PST)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> On Fri, 9 Jan 2009, H. Peter Anvin wrote:
> > As far as naming is concerned, gcc effectively supports four levels,
> > which *currently* map onto macros as follows:
> > 
> > __always_inline		Inline unconditionally
> > inline			Inlining hint
> > <nothing>		Standard heuristics
> > noinline		Uninline unconditionally
> > 
> > A lot of noise is being made about the naming of the levels
> 
> The biggest problem is the <nothing>. 
> 
> The standard heuristics for that are broken, in particular for the
> "single call-site static function" case.
> 
> If gcc only inlined truly trivial functions for that case, I'd
> already be much happier. Size be damned.

See my other email. Maybe we should just stop trusting gcc and annotate
every single function call.
Ugly, but effective.

/D

-- 
Dirk Hohndel
Intel Open Source Technology Center
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