gfio: add graph axis unit change notification callbacks
This enables code that uses the graph functions to change the axis
titles on the fly to display unit information which matches how the
tick labels are shortened.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/graph.h b/graph.h
index 7c3e862..e04b5ff 100644
--- a/graph.h
+++ b/graph.h
@@ -21,6 +21,9 @@
double red, double green, double blue);
void graph_free(struct graph *bg);
+typedef void (*graph_axis_unit_change_callback)(struct graph *g, int power_of_ten);
+void graph_x_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f);
+void graph_y_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f);
#endif