diff --git a/src/libsysprof-gtk/sysprof-chart-layer.c b/src/libsysprof-gtk/sysprof-chart-layer.c
index 4dd401de..5d48a858 100644
--- a/src/libsysprof-gtk/sysprof-chart-layer.c
+++ b/src/libsysprof-gtk/sysprof-chart-layer.c
@@ -129,3 +129,16 @@ sysprof_chart_layer_set_title (SysprofChartLayer *self,
   if (g_set_str (&priv->title, title))
     g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_TITLE]);
 }
+
+void
+sysprof_chart_layer_snapshot_motion (SysprofChartLayer *self,
+                                     GtkSnapshot       *snapshot,
+                                     double             x,
+                                     double             y)
+{
+  g_return_if_fail (SYSPROF_IS_CHART_LAYER (self));
+  g_return_if_fail (GTK_IS_SNAPSHOT (snapshot));
+
+  if (SYSPROF_CHART_LAYER_GET_CLASS (self)->snapshot_motion)
+    SYSPROF_CHART_LAYER_GET_CLASS (self)->snapshot_motion (self, snapshot, x, y);
+}
diff --git a/src/libsysprof-gtk/sysprof-chart-layer.h b/src/libsysprof-gtk/sysprof-chart-layer.h
index b6aba5ff..5b4c6871 100644
--- a/src/libsysprof-gtk/sysprof-chart-layer.h
+++ b/src/libsysprof-gtk/sysprof-chart-layer.h
@@ -35,14 +35,24 @@ struct _SysprofChartLayerClass
 {
   GtkWidgetClass parent_class;
 
+  void (*snapshot_motion) (SysprofChartLayer *self,
+                           GtkSnapshot       *snapshot,
+                           double             x,
+                           double             y);
+
   /*< private >*/
   gpointer _reserved[16];
 };
 
 SYSPROF_AVAILABLE_IN_ALL
-const char *sysprof_chart_layer_get_title (SysprofChartLayer *self);
+const char *sysprof_chart_layer_get_title       (SysprofChartLayer *self);
 SYSPROF_AVAILABLE_IN_ALL
-void        sysprof_chart_layer_set_title (SysprofChartLayer *self,
-                                           const char        *title);
+void        sysprof_chart_layer_set_title       (SysprofChartLayer *self,
+                                                 const char        *title);
+SYSPROF_AVAILABLE_IN_ALL
+void        sysprof_chart_layer_snapshot_motion (SysprofChartLayer *self,
+                                                 GtkSnapshot       *snapshot,
+                                                 double             x,
+                                                 double             y);
 
 G_END_DECLS
diff --git a/src/libsysprof-gtk/sysprof-chart.c b/src/libsysprof-gtk/sysprof-chart.c
index b0315cb5..d154fec4 100644
--- a/src/libsysprof-gtk/sysprof-chart.c
+++ b/src/libsysprof-gtk/sysprof-chart.c
@@ -26,6 +26,11 @@ typedef struct
 {
   SysprofSession *session;
   char *title;
+
+  double motion_x;
+  double motion_y;
+
+  guint pointer_in_chart : 1;
 } SysprofChartPrivate;
 
 enum {
@@ -39,6 +44,58 @@ G_DEFINE_TYPE_WITH_PRIVATE (SysprofChart, sysprof_chart, GTK_TYPE_WIDGET)
 
 static GParamSpec *properties [N_PROPS];
 
+
+static void
+sysprof_chart_motion_enter_cb (SysprofChart             *self,
+                               double                    x,
+                               double                    y,
+                               GtkEventControllerMotion *motion)
+{
+  SysprofChartPrivate *priv = sysprof_chart_get_instance_private (self);
+
+  g_assert (SYSPROF_IS_CHART (self));
+  g_assert (GTK_IS_EVENT_CONTROLLER_MOTION (motion));
+
+  priv->motion_x = x;
+  priv->motion_y = y;
+  priv->pointer_in_chart = TRUE;
+
+  gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+sysprof_chart_motion_cb (SysprofChart             *self,
+                         double                    x,
+                         double                    y,
+                         GtkEventControllerMotion *motion)
+{
+  SysprofChartPrivate *priv = sysprof_chart_get_instance_private (self);
+
+  g_assert (SYSPROF_IS_CHART (self));
+  g_assert (GTK_IS_EVENT_CONTROLLER_MOTION (motion));
+
+  priv->motion_x = x;
+  priv->motion_y = y;
+
+  gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+sysprof_chart_motion_leave_cb (SysprofChart             *self,
+                               GtkEventControllerMotion *motion)
+{
+  SysprofChartPrivate *priv = sysprof_chart_get_instance_private (self);
+
+  g_assert (SYSPROF_IS_CHART (self));
+  g_assert (GTK_IS_EVENT_CONTROLLER_MOTION (motion));
+
+  priv->motion_x = -1;
+  priv->motion_y = -1;
+  priv->pointer_in_chart = FALSE;
+
+  gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
 static void
 sysprof_chart_size_allocate (GtkWidget *widget,
                              int        width,
@@ -57,6 +114,29 @@ sysprof_chart_size_allocate (GtkWidget *widget,
                               baseline);
 }
 
+static void
+sysprof_chart_snapshot (GtkWidget   *widget,
+                        GtkSnapshot *snapshot)
+{
+  SysprofChart *self = (SysprofChart *)widget;
+  SysprofChartPrivate *priv = sysprof_chart_get_instance_private (self);
+
+  g_assert (SYSPROF_IS_CHART (self));
+
+  GTK_WIDGET_CLASS (sysprof_chart_parent_class)->snapshot (widget, snapshot);
+
+  if (priv->pointer_in_chart)
+    {
+      GtkWidget *pick = gtk_widget_pick (widget, priv->motion_x, priv->motion_y, GTK_PICK_DEFAULT);
+
+      if (SYSPROF_IS_CHART_LAYER (pick))
+        sysprof_chart_layer_snapshot_motion (SYSPROF_CHART_LAYER (pick),
+                                             snapshot,
+                                             priv->motion_x,
+                                             priv->motion_y);
+    }
+}
+
 static void
 sysprof_chart_dispose (GObject *object)
 {
@@ -130,6 +210,7 @@ sysprof_chart_class_init (SysprofChartClass *klass)
   object_class->set_property = sysprof_chart_set_property;
 
   widget_class->size_allocate = sysprof_chart_size_allocate;
+  widget_class->snapshot = sysprof_chart_snapshot;
 
   properties [PROP_SESSION] =
     g_param_spec_object ("session", NULL, NULL,
@@ -147,6 +228,29 @@ sysprof_chart_class_init (SysprofChartClass *klass)
 static void
 sysprof_chart_init (SysprofChart *self)
 {
+  SysprofChartPrivate *priv = sysprof_chart_get_instance_private (self);
+  GtkEventController *motion;
+
+  priv->motion_x = -1;
+  priv->motion_y = -1;
+
+  motion = gtk_event_controller_motion_new ();
+  g_signal_connect_object (motion,
+                           "enter",
+                           G_CALLBACK (sysprof_chart_motion_enter_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (motion,
+                           "leave",
+                           G_CALLBACK (sysprof_chart_motion_leave_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+  g_signal_connect_object (motion,
+                           "motion",
+                           G_CALLBACK (sysprof_chart_motion_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+  gtk_widget_add_controller (GTK_WIDGET (self), g_steal_pointer (&motion));
 }
 
 const char *