trace-graph: Show wake latency in task plots

Add the ability for a plot to draw a empty box.

Then with this ability, change the task plots to show a hollow red
box from the time the task was woken, till the time it was scheduled.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

4 files changed, 22 insertions, 3 deletions

diff --git a/trace-graph.c b/trace-graph.c
index d62882c..be19a95 100644
--- a/trace-graph.c
+++ b/trace-graph.c
@@ -1402,7 +1402,8 @@ static gint draw_plot_line(struct graph_info *ginfo, int i,
 
 static void draw_plot_box(struct graph_info *ginfo, int i,
                           unsigned long long start,
-                          unsigned long long end, GdkGC *gc)
+                          unsigned long long end,
+                          gboolean fill, GdkGC *gc)
 {
         gint x1;
         gint x2;
@@ -1411,7 +1412,7 @@ static void draw_plot_box(struct graph_info *ginfo, int i,
         x2 = convert_time_to_x(ginfo, end);
 
         gdk_draw_rectangle(ginfo->curr_pixmap, gc,
-                           TRUE,
+                           fill,
                            x1, PLOT_BOX_TOP(i),
                            x2 - x1, PLOT_BOX_SIZE);
 }
@@ -1448,7 +1449,8 @@ static void draw_plot(struct graph_info *ginfo, struct graph_plot *plot,
                         set_color(ginfo->draw, plot->gc, plot->last_color);
                 }
 
-                draw_plot_box(ginfo, plot->pos, info.bstart, info.bend, plot->gc);
+                draw_plot_box(ginfo, plot->pos, info.bstart, info.bend,
+                              info.bfill, plot->gc);
         }
 
         if (info.line) {
diff --git a/trace-graph.h b/trace-graph.h
index 3874aa9..6a00d82 100644
--- a/trace-graph.h
+++ b/trace-graph.h
@@ -22,6 +22,7 @@ struct plot_info {
         int                     bcolor;
         unsigned long long      bstart;
         unsigned long long      bend;
+        gboolean                bfill;
 };
 
 /*
@@ -44,6 +45,7 @@ struct plot_info {
  *    bstart is the time the box starts at
  *    bend is the time the box ends at
  *     (bstart and bend are ignored if box is 0)
+ *    bfill whether or not to fill the box (default TRUE)
  *   time is the time of the current event
  *
  * end:
diff --git a/trace-plot-task.c b/trace-plot-task.c
index a42202f..32bfc68 100644
--- a/trace-plot-task.c
+++ b/trace-plot-task.c
@@ -2,10 +2,13 @@
 
 #include "trace-graph.h"
 
+#define RED 0xff
+
 struct task_plot_info {
         int                     pid;
         struct cpu_data         *cpu_data;
         unsigned long long      last_time;
+        unsigned long long      wake_time;
         int                     last_cpu;
 };
 
@@ -305,6 +308,8 @@ static int task_plot_event(struct graph_info *ginfo,
                                 task_info->last_cpu = -1;
                         }
 
+                        task_info->wake_time = record->ts;
+
                         return 1;
                 }
 
@@ -325,6 +330,13 @@ static int task_plot_event(struct graph_info *ginfo,
                                 /* Just got scheduled in */
                                 task_info->last_cpu = record->cpu;
                                 task_info->last_time = record->ts;
+                                if (task_info->wake_time) {
+                                        info->box = TRUE;
+                                        info->bfill = FALSE;
+                                        info->bstart = task_info->wake_time;
+                                        info->bend = record->ts;
+                                        info->bcolor = RED;
+                                }
                         } else if (!info->box) {
                                 /* just got scheduled out */
                                 info->box = TRUE;
@@ -335,6 +347,8 @@ static int task_plot_event(struct graph_info *ginfo,
                         }
                 }
 
+                task_info->wake_time = 0;
+
                 return 1;
         }
 
diff --git a/trace-plot.c b/trace-plot.c
index ec76d52..604b7bf 100644
--- a/trace-plot.c
+++ b/trace-plot.c
@@ -321,6 +321,7 @@ int trace_graph_plot_event(struct graph_info *ginfo,
 {
         info->line = FALSE;
         info->box = FALSE;
+        info->bfill = TRUE;
 
         if (!plot->cb->plot_event)
                 return 0;