On (21/05/20 07:57), Paul E. McKenney wrote: > > > > Sounds good. I can cook a patch and run some tests. > > Or do you want to send a patch? > > Given that you have the test setup, things might go faster if you do > the patch, especially taking timezones into consideration. Of course, > if you run into difficulties, you know where to find me. OK. Sounds good to me. > > While VCPU-2 has PVCLOCK_GUEST_STOPPED set (resuming) and is in > > check_cpu_stall(), the VCPU-3 is executing: > > > > apic_timer_interrupt() > > tick_irq_enter() > > tick_do_update_jiffies64() > > do_timer() > > OK, but the normal grace period time is way less than one second, and > the stall timeout in mainline is 21 seconds, so that would be a -lot- > of jiffies of skew. Or does the restarting really take that long a time? That's a good question. I see huge jiffies spike in the logs. I suspect that resuming a VM can take some time, especially on a "not powerful at all" overcommitted host (more virtual CPUs than physical ones).
