RE: [Xen-devel] [Patch 2 of 2]: PV-domain SMP performance Linux-part

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> "James Harper" <james.harper@xxxxxxxxxxxxxxxx> 16.01.09 12:01 >>>
>> You can pv up your Windows spinlocks in the block-instead-of-spin way
>> already (and yield-instead-of-spin is obviously even easier).
>> 
>
>But only in spinlocks that I 'own' completely right? I'm more concerned
>about spinlocks that I share with Windows (eg in NDIS).

As long as you can hook the respective OS interface (and you know it is
always used), you could do this on all spinlocks, since all that's needed is
logic in the acquire/release code (unless you want to add state to each
lock [like the spinning CPUs bitmap Keir mentioned], but that shouldn't
be necessary to achieve the intended effect).

Jan


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