linux-kernel - Re: [PATCH][RFC]: mutex: adaptive spin

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Message-ID: <20090106131643.GA15228@elte.hu>
Date:	Tue, 6 Jan 2009 14:16:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Nick Piggin <npiggin@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH][RFC]: mutex: adaptive spin


* Gregory Haskins <ghaskins@...ell.com> wrote:

> Ingo Molnar wrote:
> > There's no time or spin-rate based heuristics in this at all (i.e. these 
> > mutexes are not 'adaptive' at all!),
> 
> FYI: The original "adaptive" name was chosen in the -rt implementation 
> to reflect that the locks can adaptively spin or sleep, depending on 
> conditions.  I realize this is in contrast to the typical usage of the 
> term when it is in reference to the spin-time being based on some 
> empirical heuristics, etc as you mentioned.  Sorry for the confusion.

the current version of the -rt spinny-mutexes bits were mostly written by 
Steve, right? Historically it all started out with a more classic 
"adaptive mutexes" patchset so the name stuck i guess.

	Ingo

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