[mutter] window: Add some trace instrumentation to implement show/hide

[Marge Bot <marge-bot src gnome org>]

commit 7eb20b2c3979eb5b37f42fecbf2c9732dacc99a7
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Nov 30 12:07:16 2020 +0100

    window: Add some trace instrumentation to implement show/hide
    
    Showing and hiding caused several second stalls, and still cause large
    enough stalls to cause missed frames, makes this visible to Sysprof.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1616>

 src/core/window.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
---
diff --git a/src/core/window.c b/src/core/window.c
index 2c9a7fbb5a..c43b83a259 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -1807,6 +1807,8 @@ idle_calc_showing (gpointer data)
   GSList *displays;
   guint queue_index = GPOINTER_TO_INT (data);
 
+  COGL_TRACE_BEGIN_SCOPED (MetaWindowCalcShowing, "Window: Calc showing");
+
   g_return_val_if_fail (queue_pending[queue_index] != NULL, FALSE);
 
   meta_topic (META_DEBUG_WINDOW_STATE,
@@ -1833,6 +1835,8 @@ idle_calc_showing (gpointer data)
   unplaced = NULL;
   displays = NULL;
 
+  COGL_TRACE_BEGIN (MetaWindowCalcShowingCalc, "Window: Calc showing (calc)");
+
   tmp = copy;
   while (tmp != NULL)
     {
@@ -1857,6 +1861,11 @@ idle_calc_showing (gpointer data)
   should_show = g_slist_sort (should_show, stackcmp);
   should_show = g_slist_reverse (should_show);
 
+  COGL_TRACE_END (MetaWindowCalcShowingCalc);
+
+  COGL_TRACE_BEGIN (MetaWindowCalcShowingUnplaced,
+                    "Window: Calc showing (calc unplaced)");
+
   tmp = unplaced;
   while (tmp != NULL)
     {
@@ -1869,8 +1878,11 @@ idle_calc_showing (gpointer data)
       tmp = tmp->next;
     }
 
+  COGL_TRACE_END (MetaWindowCalcShowingUnplaced);
+
   meta_stack_freeze (display->stack);
 
+  COGL_TRACE_BEGIN (MetaWindowCalcShowingShow, "Window: Calc showing (show)");
   tmp = should_show;
   while (tmp != NULL)
     {
@@ -1882,7 +1894,9 @@ idle_calc_showing (gpointer data)
 
       tmp = tmp->next;
     }
+  COGL_TRACE_END (MetaWindowCalcShowingShow);
 
+  COGL_TRACE_BEGIN (MetaWindowCalcShowingHide, "Window: Calc showing (hide)");
   tmp = should_hide;
   while (tmp != NULL)
     {
@@ -1894,8 +1908,12 @@ idle_calc_showing (gpointer data)
 
       tmp = tmp->next;
     }
+  COGL_TRACE_END (MetaWindowCalcShowingHide);
 
+  COGL_TRACE_BEGIN (MetaWindowCalcShowingSync,
+                    "Window: Calc showing (sync stack)");
   meta_stack_thaw (display->stack);
+  COGL_TRACE_END (MetaWindowCalcShowingSync);
 
   tmp = copy;
   while (tmp != NULL)