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audio: honor QEMU_AUDIO_TIMER_PERIOD instead of waking up every *nano* second 

Now that we no longer have MIN_REARM_TIMER_NS a bug in the audio subsys has
clearly shown it self by trying to make a timer fire every nano second.

Note we have a similar problem in 1.6, 1.5 and older but there
MIN_REARM_TIMER_NS limits the wakeups caused by audio being active to
4000 times / second. This still causes a host cpu load of 50 % for simply
playing audio, where as with this patch git master is at 13%, so we should
backport this to 1.5 and 1.6 too.

Note this will not apply to 1.5 and 1.6 as is.

Cc: qemu-stable@nongnu.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2013-10-09 21:33:44 +02:00 committed by Gerd Hoffmann
parent fc8ead7467
commit b4350deed6
1 changed files with 2 additions and 1 deletions
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audio/audio.c
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@ -1124,7 +1124,8 @@ static int audio_is_timer_needed (void)
static void audio_reset_timer (AudioState *s)
{
if (audio_is_timer_needed ()) {
timer_mod (s->ts, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1);
timer_mod (s->ts,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + conf.period.ticks);
}
else {
timer_del (s->ts);