Messages in this thread | | | Date | Wed, 28 Mar 2007 12:26:57 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [rfc][patch] queued spinlocks (i386) |
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On Wed, 28 Mar 2007, Nick Piggin wrote:
> On Sat, Mar 24, 2007 at 06:29:59PM +0100, Ingo Molnar wrote: > > > > * Nikita Danilov <nikita@clusterfs.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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