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Commit 47228e48 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
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ALSA: pcm: optimize xrun detection in no-period-wakeup mode 



Add a lightweight condition on top of the xrun checking so that we can
avoid the division when the application is calling the update function
often enough.

Suggested-by: default avatarJaroslav Kysela <perex@perex.cz>
Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 59ff878f

sound/core/pcm_lib.c

+2 −0
Original line number Diff line number Diff line
@@ -380,6 +380,8 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, 
		 * the elapsed time to detect xruns.

		 */

		jdelta = jiffies - runtime->hw_ptr_jiffies;

		if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)

			goto no_delta_check;

		hdelta = jdelta - delta * HZ / runtime->rate;

		while (hdelta > runtime->hw_ptr_buffer_jiffies / 2 + 1) {

			delta += runtime->buffer_size;