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authorPaolo Bonzini <pbonzini@redhat.com>2011-03-11 16:33:58 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2011-03-21 09:23:23 +0100
commit4a998740b22aa673ea475060c787da7c545588cf (patch)
tree0bb1de0638c3dadafea4be2adeb5a071a4af8da4 /qemu-timer.c
parent74475455442398a64355428b37422d14ccc293cb (diff)
add a generic scaling mechanism for timers
This enables rt_clock timers to use nanosecond resolution, just by using the _ns functions; there is really no reason to forbid that. Migrated timers are all using vm_clock (of course; but I checked that anyway) so the timers in the savevm files are already in nanosecond resolution. So this patch makes no change to the migration format. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu-timer.c')
-rw-r--r--qemu-timer.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/qemu-timer.c b/qemu-timer.c
index bc818aeaed..ec8b4466da 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -153,12 +153,12 @@ void cpu_disable_ticks(void)
struct QEMUClock {
int type;
int enabled;
- /* XXX: add frequency */
};
struct QEMUTimer {
QEMUClock *clock;
- int64_t expire_time;
+ int64_t expire_time; /* in nanoseconds */
+ int scale;
QEMUTimerCB *cb;
void *opaque;
struct QEMUTimer *next;
@@ -386,7 +386,8 @@ void qemu_clock_enable(QEMUClock *clock, int enabled)
clock->enabled = enabled;
}
-QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque)
+QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
+ QEMUTimerCB *cb, void *opaque)
{
QEMUTimer *ts;
@@ -394,6 +395,7 @@ QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque)
ts->clock = clock;
ts->cb = cb;
ts->opaque = opaque;
+ ts->scale = scale;
return ts;
}
@@ -424,7 +426,7 @@ void qemu_del_timer(QEMUTimer *ts)
/* modify the current timer so that it will be fired when current_time
>= expire_time. The corresponding callback will be called. */
-void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
+static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time)
{
QEMUTimer **pt, *t;
@@ -457,6 +459,13 @@ void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
}
}
+/* modify the current timer so that it will be fired when current_time
+ >= expire_time. The corresponding callback will be called. */
+void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
+{
+ qemu_mod_timer_ns(ts, expire_time * ts->scale);
+}
+
int qemu_timer_pending(QEMUTimer *ts)
{
QEMUTimer *t;
@@ -471,7 +480,7 @@ int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
{
if (!timer_head)
return 0;
- return (timer_head->expire_time <= current_time);
+ return (timer_head->expire_time <= current_time * timer_head->scale);
}
static void qemu_run_timers(QEMUClock *clock)
@@ -482,7 +491,7 @@ static void qemu_run_timers(QEMUClock *clock)
if (!clock->enabled)
return;
- current_time = qemu_get_clock (clock);
+ current_time = qemu_get_clock_ns(clock);
ptimer_head = &active_timers[clock->type];
for(;;) {
ts = *ptimer_head;
@@ -559,7 +568,7 @@ void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
expire_time = qemu_get_be64(f);
if (expire_time != -1) {
- qemu_mod_timer(ts, expire_time);
+ qemu_mod_timer_ns(ts, expire_time);
} else {
qemu_del_timer(ts);
}
@@ -717,7 +726,7 @@ static int64_t qemu_next_alarm_deadline(void)
delta = hdelta;
}
if (active_timers[QEMU_CLOCK_REALTIME]) {
- rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time * 1000000 -
+ rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time -
qemu_get_clock_ns(rt_clock));
if (rtdelta < delta)
delta = rtdelta;