gfio: clear graphs for repeated runs on same connection

Otherwise we get overlapping data.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

gfio.c

@@ -654,6 +654,12 @@ static void gfio_client_added(struct gui_entry *ge, struct fio_client *client)
 	gc->o_list_nr++;
 }
 
+static void gfio_clear_graph_data(struct gfio_graphs *g)
+{
+	graph_clear_values(g->iops_graph);
+	graph_clear_values(g->bandwidth_graph);
+}
+
 static void connect_clicked(GtkWidget *widget, gpointer data)
 {
 	struct gui_entry *ge = data;
@@ -694,6 +700,7 @@ static void connect_clicked(GtkWidget *widget, gpointer data)
 			if (!ge->ui->handler_running)
 				pthread_create(&ge->ui->t, NULL, job_thread, ge->ui);
 			gfio_set_state(ge, GE_STATE_CONNECTED);
+			gfio_clear_graph_data(&ge->graphs);
 		} else {
 			gfio_report_error(ge, "Failed to connect to %s: %s\n", ge->client->client->hostname, strerror(-ret));
 		}

graph.c

@@ -853,6 +853,17 @@ static void graph_free_labels(struct graph *g)
 	}
 }
 
+void graph_clear_values(struct graph *g)
+{
+	struct flist_head *node;
+	struct graph_label *i;
+
+	flist_for_each(node, &g->label_list) {
+		i = flist_entry(node, struct graph_label, list);
+		graph_free_values(i);
+	}
+}
+
 void graph_set_color(struct graph *gr, graph_label_t label, double red,
 		     double green, double blue)
 {

graph.h

@@ -93,5 +93,7 @@ extern int graph_contains_xy(struct graph *p, int x, int y);
 extern void graph_set_base_offset(struct graph *g, unsigned int base_offset);
 extern void graph_set_graph_all_zeroes(struct graph *g, unsigned int set);
 
+extern void graph_clear_values(struct graph *g);
+
 #endif