Use maximum over all traces for queue depth

So far we used maximum of the first trace for the maximum range of the
queue depth graph. Use maximum over all traces similarly as for other
line graphs.

Signed-off-by: Jan Kara <jack@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/iowatcher/main.c b/iowatcher/main.c
index cbe915571c0e8f3c7d28db2ce44940f57ae101c9..b13f509ac943f02062db5e8411b2f0fd8f68c175 100644 (file)
--- a/iowatcher/main.c
+++ b/iowatcher/main.c
@@ -991,6 +991,7 @@ static void plot_queue_depth(struct plot *plot, unsigned int min_seconds,
                             unsigned int max_seconds)
 {
        struct trace_file *tf;
+       u64 max = 0, val;
 
        if (active_graphs[QUEUE_DEPTH_GRAPH_INDEX] == 0)
                return;
@@ -1000,9 +1001,17 @@ static void plot_queue_depth(struct plot *plot, unsigned int min_seconds,
        if (num_traces > 1)
                svg_alloc_legend(plot, num_traces);
 
-       tf = list_entry(all_traces.next, struct trace_file, list);
+       list_for_each_entry(tf, &all_traces, list) {
+               val = line_graph_roll_avg_max(tf->queue_depth_gld);
+               if (val > max)
+                       max = val;
+       }
+
+       list_for_each_entry(tf, &all_traces, list)
+               tf->queue_depth_gld->max = max;
+
        set_ylabel(plot, "Pending IO");
-       set_yticks(plot, num_yticks, 0, tf->queue_depth_gld->max, "");
+       set_yticks(plot, num_yticks, 0, max, "");
        set_xticks(plot, num_xticks, min_seconds, max_seconds);
 
        list_for_each_entry(tf, &all_traces, list) {