Re: [Xen-devel] Ticket spinlocks and MP guests

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15/2/08 08:27, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

>> Side effect of ticket-based locks, or pv'ed sleeping locks?
>> 
>> -- Keir
>> 
> 
> Side effect about pv'ed sleeping locks, since originally maybe
> dozens of cycles are used to spin lock while pv'ed locks force
> hypercall to Xen and may even require owner with another
> unlock hypercall to notify back?

You would of course spin for a while and only then sleep. That's a standard
mutex implementation trick.

 -- Keir



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