On Thu, Jul 19, 2018 at 01:43:56PM +0200, Manuel Bouyer wrote: > Hello, > while debugging why XEN domU kernels hang on psrlz, I found that, when > this happens, pserialize_switchpoint() seems to not be called for one of the > CPUs (not always the same). The CPU in question doens't show up in > psz->psz_pass. I also noticed that sometimes, pserialize_perform() seems > to take much longer (several seconds) than it should. > > Now my question: how is pserialize_switchpoint() supposed to be called ? > I see it's called from softint_dispatch() but Xen doesn't use it > (no fast soft interrupts). > I see it's called from lwp_startup() and mi_switch(), but only if > there is a context switch. If the CPU is idle, it will never be called.
This is also true if a single cpu-bound process is running on the CPU ... -- Manuel Bouyer <[email protected]> NetBSD: 26 ans d'experience feront toujours la difference --
