Re: [Xen-devel] [PATCH RFC V6 0/11] Paravirtualized ticketlocks

[Andi Kleen <andi@xxxxxxxxxxxxxx>]

> So if a guest exits due to an external event it's easy to inspect the
> state of that guest and avoid to schedule away when it was interrupted
> in a spinlock held section. That guest/host shared state needs to be

On a large system under high contention sleeping can perform surprisingly
well. pthread mutexes have a tendency to beat kernel spinlocks there.
So avoiding sleeping locks completely (that is what pv locks are
essentially) is not necessarily that good.

Your proposal is probably only a good idea on low contention
and relatively small systems.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.

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