On Sat, Jun 12, 2010 at 3:15 PM, Charles Forsyth <fors...@terzarima.net> wrote: >>in Linux parlance, Plan 9 is a "preemptible" kernel. Interrupt handlers can >>be interrupted, so to speak. > > interrupt handlers are not normally interruptible during the interrupt > processing, but rather at the end (eg, when anyhigher, anyready or preempted > is called).
Yes, I was not careful enough in how I said that. For those who wonder what I was trying to say, see trap(); note what happens after the isr() is called and look where preempted() is called. But, all this said, the problems we're seeing on 9vx are strangely similar to the ones I had on Xen when code that was not supposed to be interrupted got interrupted. There may be no real connection at all however. ron
