Bryan O'Donoghue cbd204b48d greybus: loopback: provide interface to read all latency data-points ...

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>

2015-07-28 14:56:31 -07:00

drivers/staging/greybus

greybus: loopback: provide interface to read all latency data-points

2015-07-28 14:56:31 -07:00

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