From d6d01c85a61aaad7ff468f7896d34efe17077c1a Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Sun, 30 Apr 2017 20:49:26 +0200
Subject: [PATCH] wayland: Collect frame completion time once for all surfaces

Dispatch all surface frames with the same monotonic time to avoid
querying it too often.

https://bugzilla.gnome.org/show_bug.cgi?id=782344
---
 src/wayland/meta-wayland.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/wayland/meta-wayland.c b/src/wayland/meta-wayland.c
index 03cccdb88..7bbd0961d 100644
--- a/src/wayland/meta-wayland.c
+++ b/src/wayland/meta-wayland.c
@@ -179,12 +179,14 @@ meta_wayland_compositor_update (MetaWaylandCompositor *compositor,
 void
 meta_wayland_compositor_paint_finished (MetaWaylandCompositor *compositor)
 {
+  gint64 current_time = g_get_monotonic_time ();
+
   while (!wl_list_empty (&compositor->frame_callbacks))
     {
       MetaWaylandFrameCallback *callback =
         wl_container_of (compositor->frame_callbacks.next, callback, link);
 
-      wl_callback_send_done (callback->resource, g_get_monotonic_time () / 1000);
+      wl_callback_send_done (callback->resource, current_time / 1000);
       wl_resource_destroy (callback->resource);
     }
 }