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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: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -380,6 +380,8 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
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* the elapsed time to detect xruns.
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*/
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jdelta = jiffies - runtime->hw_ptr_jiffies;
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if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
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goto no_delta_check;
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hdelta = jdelta - delta * HZ / runtime->rate;
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while (hdelta > runtime->hw_ptr_buffer_jiffies / 2 + 1) {
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delta += runtime->buffer_size;
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