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new function qemu_icount_delta

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Tweaking the rounding in qemu_next_deadline ensures that there's
no change whatsoever.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2010-03-10 11:38:51 +01:00 committed by Anthony Liguori
parent 6325504302
commit a2aaa079df
1 changed files with 18 additions and 11 deletions
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29
vl.c
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@ -548,6 +548,22 @@ static int64_t cpu_get_clock(void)
}
}
#ifndef CONFIG_IOTHREAD
static int64_t qemu_icount_delta(void)
{
if (!use_icount) {
return 5000 * (int64_t) 1000000;
} else if (use_icount == 1) {
/* When not using an adaptive execution frequency
we tend to get badly out of sync with real time,
so just delay for a reasonable amount of time. */
return 0;
} else {
return cpu_get_icount() - cpu_get_clock();
}
}
#endif
/* enable cpu_get_ticks() */
void cpu_enable_ticks(void)
{
@ -4051,25 +4067,16 @@ static int qemu_calculate_timeout(void)
timeout = 5000;
else if (tcg_has_work())
timeout = 0;
else if (!use_icount)
timeout = 5000;
else {
/* XXX: use timeout computed from timers */
int64_t add;
int64_t delta;
/* Advance virtual time to the next event. */
if (use_icount == 1) {
/* When not using an adaptive execution frequency
we tend to get badly out of sync with real time,
so just delay for a reasonable amount of time. */
delta = 0;
} else {
delta = cpu_get_icount() - cpu_get_clock();
}
delta = qemu_icount_delta();
if (delta > 0) {
/* If virtual time is ahead of real time then just
wait for IO. */
timeout = (delta / 1000000) + 1;
timeout = (delta + 999999) / 1000000;
} else {
/* Wait for either IO to occur or the next
timer event. */