cbd204b48d
The current loopback code provides the minimum, maximum and average latency values for a given test set. It would be highly useful for user-space to have access to each one of the latency metrics in order to graph outliers. This patch adds a simple character device interface implmenting a read() interface that allows user-space to read out the saved latency metrics which have been stored in a kfifo for this purpose. A module parameter is provided to allow varying the depth of the kfifo in order to allow a user to capture potentially large data sets. This version sets the default depth for the kfifo at 8192 dwords. Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>