On 10/12/2009 09:50 AM, Jan Kiszka wrote:
Apic is lockless. For ioapic/pic I used spinlocks initially, but Avi
prefers mutexes. Theoretically it is possible to make them lockless,
but code will be complex and eventually more slow, since more then two
atomic operation will be used on irq injection path.
Well, lockless is another thing.
But also converting to spinlocks would indeed add some overhead:
irqsave/restore. But I wonder if this isn't worth it, at least when
looking at the (supposed to be fast) device passthrough scenario which
would be simpler and faster.
I'm worried about disabling irqs for non-device-assignment cases. It
would be more palatable if ioapic was completely O(1) (there are some
per-vcpu loops in there, shouldn't be too bad for 16 vcpus, but we want
to scale).
--
error compiling committee.c: too many arguments to function
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