linux-kernel - Re: Btrfs for mainline

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Message-ID: <20090107132447.GR2002@parisc-linux.org>
Date:	Wed, 7 Jan 2009 06:24:47 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	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>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: Btrfs for mainline

On Wed, Jan 07, 2009 at 02:07:42PM +0100, Ingo Molnar wrote:
> * Chris Mason <chris.mason@...cle.com> wrote:
> > All of this is a long way of saying the btrfs locking scheme is far from 
> > perfect.  I'll look harder at the loop and ways to get rid of it.
> 
> <ob'plug>
> 
> adaptive spinning mutexes perhaps? Such as:

Um, I don't know how your mail client does threading, but mine shows
Peter's message introducing the adaptive spinning mutexes as a reply to
one of Chris' messages in the btrfs thread.

Chris is just saying he'll look at other ways to not need the spinning
mutexes.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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