linux-kernel - Re: gcc inlining heuristics was Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

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Message-ID: <20090119062212.GC22584@wotan.suse.de>
Date:	Mon, 19 Jan 2009 07:22:12 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Bernd Schmidt <bernds_cb1@...nline.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Harvey Harrison <harvey.harrison@...il.com>,
	"H. Peter Anvin" <hpa@...or.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>,
	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>,
	Peter Morreale <pmorreale@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>, jh@...e.cz
Subject: Re: gcc inlining heuristics was Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

On Mon, Jan 19, 2009 at 01:13:45AM +0100, Ingo Molnar wrote:
> 
> * Bernd Schmidt <bernds_cb1@...nline.de> wrote:
> 
> > Linus Torvalds wrote:
> > > But you'll need some background to it:
> > 
> > You paint a somewhat one-sided picture bordering on FUD.
> 
> Type based aliasing should at most have been an opt-in for code that 
> cares, not a turned-on-by-default feature for everyone.

I want to know what is the problem with the restrict keyword?
I'm sure I've read Linus ranting about how bad it is in the
past... it seems like a nice opt-in thing that can be used where
the aliases are verified and the code is particularly performance
critical...

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