On 08/26/2009 04:38 PM, Marcelo Tosatti wrote:
An injectable timer interrupt is defined by: - time(now)>= time(next_expiration) - Previous timer interrupt has been acked (thus we can inject). The thing is, sure you can drop ack notifiers and check IRR on every guest entry, but why bother if you can receive an asynchronous notification? Would you prefer to replace + if (!ktimer->can_inject) With kvm_set_irq() ? Not relatively cheap.
Well, we expect it to be a rare condition that we have pending timer interrupts, so if it leads to significant code simplification, it can be worthwhile.
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