Date: Mon, 19 Jan 2009 07:22:12 +0100
From: Nick Piggin <npiggin@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Bernd Schmidt <bernds_cb1@t-online.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andi Kleen <andi@firstfloor.org>, David Woodhouse <dwmw2@infradead.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Harvey Harrison <harvey.harrison@gmail.com>,
       "H. Peter Anvin" <hpa@zytor.com>, Chris Mason <chris.mason@oracle.com>,
       Peter Zijlstra <peterz@infradead.org>,
       Steven Rostedt <rostedt@goodmis.org>, paulmck@linux.vnet.ibm.com,
       Gregory Haskins <ghaskins@novell.com>, Matthew Wilcox <matthew@wil.cx>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-fsdevel <linux-fsdevel@vger.kernel.org>,
       linux-btrfs <linux-btrfs@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Morreale <pmorreale@novell.com>,
       Sven Dietrich <SDietrich@novell.com>, jh@suse.cz
Subject: Re: gcc inlining heuristics was Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning
Message-ID: <20090119062212.GC22584@wotan.suse.de>
References: <alpine.LFD.2.00.0901111458290.6528@localhost.localdomain> <20090112001255.GR26290@one.firstfloor.org> <alpine.LFD.2.00.0901111619400.6528@localhost.localdomain> <20090112005228.GS26290@one.firstfloor.org> <496B86B5.3090707@t-online.de> <alpine.LFD.2.00.0901121034170.6528@localhost.localdomain> <20090112193201.GA23848@one.firstfloor.org> <alpine.LFD.2.00.0901121128080.6528@localhost.localdomain> <496BBE27.2020206@t-online.de> <20090119001345.GA9880@elte.hu>
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On Mon, Jan 19, 2009 at 01:13:45AM +0100, Ingo Molnar wrote:
> 
> * Bernd Schmidt <bernds_cb1@t-online.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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