linux-kernel - Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

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Date:	Fri, 09 Jan 2009 21:03:01 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Harvey Harrison <harvey.harrison@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.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>,
	Matthew Wilcox <matthew@....cx>,
	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>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

Linus Torvalds wrote:
> 
> There's none. In fact, it's wrong, unless you _also_ have an extern 
> definition (according to the "new" gcc rules as of back in the days).
> 
> Of course, as long as "inline" really means _always_ inline, it won't 
> matter. So in that sense Ingo is right - we _could_. Which has no bearing 
> on whether we _should_, of course.
> 

I was thinking about experimenting with this, to see what level of
upside it might add.  Ingo showed me numbers which indicate that a
fairly significant fraction of the cases where removing inline helps is
in .h files, which would require code movement to fix.  Hence to see if
it can be automated.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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