On 10/07/2010 08:03 PM, Gleb Natapov wrote:
> >>
> >Host side keeps track of outstanding apfs and will not send apf for the
> >same phys address twice. It will halt vcpu instead.
>
> What about different pages, running the scheduler code?
>
We can get couple of nested apfs, just like we can get nested
interrupts. Since scheduler disables preemption second apf will halt.
How much is a couple?
Consider:
SIGSTOP
Entire process swapped out
SIGCONT
We can get APF's on the current code, the scheduler code, the stack, any
debugging code in between (e.g. ftrace), and the page tables for all of
these.
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