diff options
| author | Steven Toth <stoth@kernellabs.com> | 2010-07-31 15:10:52 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-10-21 07:54:52 -0200 |
| commit | 58acca1056434dbbbcb3f1aacd759f1039a3169d (patch) | |
| tree | 66661f935aae0ca46a6cba3a7daf2280acf7bd4c /drivers/media/video/saa7164/saa7164-encoder.c | |
| parent | 66e1d37884eb43214292ed433fcffb72692c4838 (diff) | |
| download | op-kernel-dev-58acca1056434dbbbcb3f1aacd759f1039a3169d.zip op-kernel-dev-58acca1056434dbbbcb3f1aacd759f1039a3169d.tar.gz | |
[media] saa7164: measure via histograms various irq and queue latencies
saa7164: measure via histograms various irq and queue latencies
Attempting to determine where buffering issues under high load are due
to highly latent irq or work queue handling.
Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/saa7164/saa7164-encoder.c')
| -rw-r--r-- | drivers/media/video/saa7164/saa7164-encoder.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/media/video/saa7164/saa7164-encoder.c b/drivers/media/video/saa7164/saa7164-encoder.c index e340a6e..5f73ced 100644 --- a/drivers/media/video/saa7164/saa7164-encoder.c +++ b/drivers/media/video/saa7164/saa7164-encoder.c @@ -1030,6 +1030,14 @@ static ssize_t fops_read(struct file *file, char __user *buffer, int rem, cnt; u8 *p; + port->last_read_msecs_diff = port->last_read_msecs; + port->last_read_msecs = jiffies_to_msecs(jiffies); + port->last_read_msecs_diff = port->last_read_msecs - + port->last_read_msecs_diff; + + saa7164_histogram_update(&port->read_interval, + port->last_read_msecs_diff); + if (*pos) return -ESPIPE; @@ -1114,6 +1122,14 @@ static unsigned int fops_poll(struct file *file, poll_table *wait) struct saa7164_user_buffer *ubuf; unsigned int mask = 0; + port->last_poll_msecs_diff = port->last_poll_msecs; + port->last_poll_msecs = jiffies_to_msecs(jiffies); + port->last_poll_msecs_diff = port->last_poll_msecs - + port->last_poll_msecs_diff; + + saa7164_histogram_update(&port->poll_interval, + port->last_poll_msecs_diff); + if (!video_is_registered(port->v4l_device)) { return -EIO; } |
