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Re: spinlock requests (was RE: [Xen-devel] [Patch] don't spin with irq d
| To: | Juergen Gross <juergen.gross@xxxxxxxxxxxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
|---|---|
| Subject: | Re: spinlock requests (was RE: [Xen-devel] [Patch] don't spin with irq disabled) |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 31 Mar 2009 14:48:18 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 31 Mar 2009 06:48:42 -0700 |
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| Thread-topic: | spinlock requests (was RE: [Xen-devel] [Patch] don't spin with irq disabled) |
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On 31/03/2009 14:40, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxxxxxxx> wrote: > Dan Magenheimer wrote: >> Thanks Juergen. Do you know of any GPLv2 code that implements >> this improved rwlock solution? (I don't think Linux does, >> does it?) > > Good question. > I just looked into the Linux code and decided not to analyse it. :-) > I have implemented a solution for our BS2000 system on Xen. It is just > a rather simple state machine using the cmpxchg instruction for the > update of the (structured) lock word. > If there is common interest for this solution I could prepare a patch. If we care that much about fairness we should use ticket- or queue-based locks. I don't believe any of our locks are contended enough to be a concern. If they were, that would be a concern in itself. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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