linux-kernel - Re: [rfc][patch] queued spinlocks (i386)

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Date:	Wed, 28 Mar 2007 12:26:57 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Nick Piggin <npiggin@...e.de>
cc:	Ingo Molnar <mingo@...e.hu>, Nikita Danilov <nikita@...sterfs.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ravikiran G Thirumalai <kiran@...lex86.org>
Subject: Re: [rfc][patch] queued spinlocks (i386)

On Wed, 28 Mar 2007, Nick Piggin wrote:

> On Sat, Mar 24, 2007 at 06:29:59PM +0100, Ingo Molnar wrote:
> > 
> > * Nikita Danilov <nikita@...sterfs.com> wrote:
> > 
> > > Indeed, this technique is very well known. E.g., 
> > > http://citeseer.ist.psu.edu/anderson01sharedmemory.html has a whole 
> > > section (3. Local-spin Algorithms) on them, citing papers from the 
> > > 1990 onward.
> > 
> > that is a cool reference! So i'd suggest to do (redo?) the patch based 
> > on those concepts and that terminology and not use 'queued spinlocks' 
> > that are commonly associated with MS's stuff. And as a result the 
> > contended case would be optimized some more via local-spin algorithms. 
> > (which is not a key thing for us, but which would be nice to have 
> > nevertheless)
> 
> Firstly, the terminology in that paper _is_ "queue lock", which isn't
> really surprising. I don't really know or care about what MS calls their
> locks, but I'd suggest that their queued spinlock is probably named in
> reference to its queueing property rather than its local spin property.

The method you propose is otherwise called "Ticket Lock":

http://en.wikipedia.org/wiki/Ticket_lock
http://www.cs.rochester.edu/research/synchronization/pseudocode/ss.html#ticket




- Davide


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