Re: [Qemu-devel] [PATCH 11/19] use a bottom half to run timers

[Paolo Bonzini]

On 12/24/2009 12:25 PM, Marcelo Tosatti wrote:
     /* rearm timer, if not periodic */
     if (t->expired) {
         t->expired = 0;
         qemu_rearm_alarm_timer(t);
     }
     ->  host_alarm_handler fires, sets bh->scheduled = 1
     ->  qemu_mod_timer sees qemu_alarm_pending() == true and does
        not rearm the alarm timer.

The bottom half will be reexecuted right away and the alarm will be 
rearmed then.  So if it happens once it is not a problem.  If it happens 
continuously, you have a sort of interrupt storm so this is the least of 
your problems. :-)

Paolo