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