[Bluez-devel] PATCH2/2: bluez-utils - avoid-unnecessary-polls

["Kai Vehmanen" <kai.vehmanen@nokia.com>]

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Hello again,

here's the second patch to ALSA A2DP plugin in bluez-utils
(see my previous mail).

This patch changes the worker thread poll timeout to be 
calculated according to application chosen period size. 
This allows to decrease the CPU load significantly for those 
applications that do not require an ultra small period
size. Without the patch (poll timeout of 1msec), the system 
call load is pretty heavy...

Br,
-- 
first.surname@nokia.com (Kai Vehmanen)

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diff -ruN bluez-utils.orig/audio/pcm_bluetooth.c bluez-utils/audio/pcm_bluetooth.c
--- bluez-utils.orig/audio/pcm_bluetooth.c	2007-10-12 15:07:40.000000000 +0300
+++ bluez-utils/audio/pcm_bluetooth.c	2007-10-12 15:04:58.000000000 +0300
@@ -168,12 +168,17 @@
 	double period_time;
 	struct timeval start;
 	struct pollfd fds[2];
+	int poll_timeout;
 
 	fds[0] = data->server;
 	fds[1] = data->stream;
 
 	prev_periods = 0;
 	period_time = 1000000.0 * data->io.period_size / data->io.rate;
+	if (period_time > (int)(MIN_PERIOD_TIME * 1000))
+		poll_timeout = (int)(period_time / 1000.0f);
+	else
+		poll_timeout = MIN_PERIOD_TIME;
 
 	gettimeofday(&start, 0);
 
@@ -214,7 +219,8 @@
 		}
 
 iter_sleep:
-		ret = poll(fds, 2, MIN_PERIOD_TIME);
+		/* sleep up to one period interval */
+		ret = poll(fds, 2, poll_timeout);
 		if (ret < 0) {
 			SNDERR("poll error: %s (%d)", strerror(errno), errno);
 			if (errno != EINTR)

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