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

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Message-ID: <20090112084041.GA21976@elte.hu>
Date:	Mon, 12 Jan 2009 09:40:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Harvey Harrison <harvey.harrison@...il.com>,
	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


* Jamie Lokier <jamie@...reable.org> wrote:

> Ingo Molnar wrote:
> > If it's used once in a single .c file it should be inlined even if
> > it's large.
> 
> As Linus has pointed out, because of GCC not sharing stack among 
> different inlined functions, the above is surprisingly not true.

Yes, but note that this has no relevance to the specific case of 
CONFIG_OPTIMIZE_INLINING: GCC can at most decide to inline _less_, not 
more. I.e. under CONFIG_OPTIMIZE_INLINING we can only end up having less 
stack sharing trouble.

	Ingo
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