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Message-ID: <alpine.LFD.2.00.0901071509160.3057@localhost.localdomain>
Date: Wed, 7 Jan 2009 15:10:27 -0800 (PST)
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Peter Zijlstra <peterz@...radead.org>
cc: Steven Rostedt <rostedt@...dmis.org>, paulmck@...ux.vnet.ibm.com,
Gregory Haskins <ghaskins@...ell.com>,
Ingo Molnar <mingo@...e.hu>, Matthew Wilcox <matthew@....cx>,
Andi Kleen <andi@...stfloor.org>,
Chris Mason <chris.mason@...cle.com>,
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>
Subject: Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning
On Wed, 7 Jan 2009, Peter Zijlstra wrote:
>
> Hmm, still wouldn't the spin_on_owner() loopyness and the above need
> that need_resched() check you mentioned to that it can fall into the
> slow path and go to sleep?
Yes, I do think that the outer loop at least should have a test for
need_resched().
Please take all my patches to be pseudo-code. They've neither been
compiled nor tested, and I'm just posting them in the hope that somebody
else will then do things in the direction I think is the proper one ;)
Linus
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