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aio / timers: Use all timerlists in icount warp calculations

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Notify all timerlists derived from vm_clock in icount warp
calculations.

When calculating timer delay based on vm_clock deadline, use
all timerlists.

For compatibility, maintain an apparent bug where when using
icount, if no vm_clock timer was set, qemu_clock_deadline
would return INT32_MAX and always set an icount clock expiry
about 2 seconds ahead.

NB: thread safety - when different timerlists sit on different
threads, this will need some locking.

Signed-off-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alex Bligh 2013-08-21 16:02:57 +01:00 • committed by Stefan Hajnoczi
parent a3a726ae09
commit ac70aafc28
4 changed files with 67 additions and 10 deletions
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16
qemu-timer.c
View file

@ -392,6 +392,22 @@ int64_t qemu_clock_deadline_ns(QEMUClock *clock)
return timerlist_deadline_ns(clock->main_loop_timerlist);
}
/* Calculate the soonest deadline across all timerlists attached
* to the clock. This is used for the icount timeout so we
* ignore whether or not the clock should be used in deadline
* calculations.
*/
int64_t qemu_clock_deadline_ns_all(QEMUClock *clock)
{
int64_t deadline = -1;
QEMUTimerList *timer_list;
QLIST_FOREACH(timer_list, &clock->timerlists, list) {
deadline = qemu_soonest_timeout(deadline,
timerlist_deadline_ns(timer_list));
}
return deadline;
}
QEMUClock *timerlist_get_clock(QEMUTimerList *timer_list)
{
return timer_list->clock;