Fixup profiler

This is a hack to let us test the profiler D-Bus api,
since non-unique apps don't take a name on the bus.

demos/widget-factory/widget-factory.c

@@ -1977,7 +1977,7 @@ main (int argc, char *argv[])
   };
   gint status;
 
-  app = gtk_application_new ("org.gtk.WidgetFactory", G_APPLICATION_NON_UNIQUE);
+  app = gtk_application_new ("org.gtk.WidgetFactory", 0);
 
   g_action_map_add_action_entries (G_ACTION_MAP (app),
                                    app_entries, G_N_ELEMENTS (app_entries),

gdk/Makefile.am

@@ -175,7 +175,10 @@ gdk_c_sources = 				\
 	gdkselection.c				\
 	gdkvisual.c				\
 	gdkwindow.c				\
-	gdkwindowimpl.c
+	gdkwindowimpl.c				\
+	gdkprofiler.c				\
+	capture/sp-capture-writer.c		\
+	capture/sp-clock.c
 
 gdk_built_sources = 				\
 	gdkenumtypes.h				\

gdk/capture/sp-capture-types.h

@@ -0,0 +1,224 @@
+/* sp-capture-types.h
+ *
+ * Copyright © 2016 Christian Hergert <chergert@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SP_CAPTURE_FORMAT_H
+#define SP_CAPTURE_FORMAT_H
+
+#include <glib.h>
+
+#ifndef SP_DISABLE_GOBJECT
+# include <glib-object.h>
+#endif
+
+#include "sp-clock.h"
+
+G_BEGIN_DECLS
+
+#define SP_CAPTURE_MAGIC (GUINT32_TO_LE(0xFDCA975E))
+#define SP_CAPTURE_ALIGN (sizeof(SpCaptureAddress))
+
+#if __WORDSIZE == 64
+# define SP_CAPTURE_JITMAP_MARK    G_GUINT64_CONSTANT(0xE000000000000000)
+# define SP_CAPTURE_ADDRESS_FORMAT "0x%016lx"
+#else
+# define SP_CAPTURE_JITMAP_MARK    G_GUINT64_CONSTANT(0xE0000000)
+# define SP_CAPTURE_ADDRESS_FORMAT "0x%016llx"
+#endif
+
+#define SP_CAPTURE_CURRENT_TIME   (sp_clock_get_current_time())
+#define SP_CAPTURE_COUNTER_INT64  0
+#define SP_CAPTURE_COUNTER_DOUBLE 1
+
+typedef struct _SpCaptureReader    SpCaptureReader;
+typedef struct _SpCaptureWriter    SpCaptureWriter;
+typedef struct _SpCaptureCursor    SpCaptureCursor;
+typedef struct _SpCaptureCondition SpCaptureCondition;
+
+typedef guint64 SpCaptureAddress;
+
+typedef union
+{
+  gint64  v64;
+  gdouble vdbl;
+} SpCaptureCounterValue;
+
+typedef enum
+{
+  SP_CAPTURE_FRAME_TIMESTAMP = 1,
+  SP_CAPTURE_FRAME_SAMPLE    = 2,
+  SP_CAPTURE_FRAME_MAP       = 3,
+  SP_CAPTURE_FRAME_PROCESS   = 4,
+  SP_CAPTURE_FRAME_FORK      = 5,
+  SP_CAPTURE_FRAME_EXIT      = 6,
+  SP_CAPTURE_FRAME_JITMAP    = 7,
+  SP_CAPTURE_FRAME_CTRDEF    = 8,
+  SP_CAPTURE_FRAME_CTRSET    = 9,
+  SP_CAPTURE_FRAME_MARK      = 10,
+} SpCaptureFrameType;
+
+#pragma pack(push, 1)
+
+typedef struct
+{
+  guint32 magic;
+  guint8  version;
+  guint32 little_endian : 1;
+  guint32 padding : 23;
+  gchar   capture_time[64];
+  gint64  time;
+  gint64  end_time;
+  gchar   suffix[168];
+} SpCaptureFileHeader;
+
+typedef struct
+{
+  guint16 len;
+  gint16  cpu;
+  gint32  pid;
+  gint64  time;
+  guint8  type;
+  guint64 padding : 56;
+  guint8  data[0];
+} SpCaptureFrame;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+  guint64        start;
+  guint64        end;
+  guint64        offset;
+  guint64        inode;
+  gchar          filename[0];
+} SpCaptureMap;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+  guint32        n_jitmaps;
+  guint8         data[0];
+} SpCaptureJitmap;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+  gchar          cmdline[0];
+} SpCaptureProcess;
+
+typedef struct
+{
+  SpCaptureFrame   frame;
+  guint16          n_addrs;
+  guint64          padding : 48;
+  SpCaptureAddress addrs[0];
+} SpCaptureSample;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+  GPid           child_pid;
+} SpCaptureFork;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+} SpCaptureExit;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+} SpCaptureTimestamp;
+
+typedef struct
+{
+  gchar                 category[32];
+  gchar                 name[32];
+  gchar                 description[52];
+  guint32               id : 24;
+  guint8                type;
+  SpCaptureCounterValue value;
+} SpCaptureCounter;
+
+typedef struct
+{
+  SpCaptureFrame   frame;
+  guint16          n_counters;
+  guint64          padding : 48;
+  SpCaptureCounter counters[0];
+} SpCaptureFrameCounterDefine;
+
+typedef struct
+{
+  /*
+   * 96 bytes might seem a bit odd, but the counter frame header is 32
+   * bytes.  So this makes a nice 2-cacheline aligned size which is
+   * useful when the number of counters is rather small.
+   */
+  guint32               ids[8];
+  SpCaptureCounterValue values[8];
+} SpCaptureCounterValues;
+
+typedef struct
+{
+  SpCaptureFrame         frame;
+  guint16                n_values;
+  guint64                padding : 48;
+  SpCaptureCounterValues values[0];
+} SpCaptureFrameCounterSet;
+
+typedef struct
+{
+  SpCaptureFrame frame;
+  gint64         duration;
+  gchar          group[24];
+  gchar          name[40];
+  gchar          message[0];
+} SpCaptureMark;
+
+#pragma pack(pop)
+
+G_STATIC_ASSERT (sizeof (SpCaptureFileHeader) == 256);
+G_STATIC_ASSERT (sizeof (SpCaptureFrame) == 24);
+G_STATIC_ASSERT (sizeof (SpCaptureMap) == 56);
+G_STATIC_ASSERT (sizeof (SpCaptureJitmap) == 28);
+G_STATIC_ASSERT (sizeof (SpCaptureProcess) == 24);
+G_STATIC_ASSERT (sizeof (SpCaptureSample) == 32);
+G_STATIC_ASSERT (sizeof (SpCaptureFork) == 28);
+G_STATIC_ASSERT (sizeof (SpCaptureExit) == 24);
+G_STATIC_ASSERT (sizeof (SpCaptureTimestamp) == 24);
+G_STATIC_ASSERT (sizeof (SpCaptureCounter) == 128);
+G_STATIC_ASSERT (sizeof (SpCaptureCounterValues) == 96);
+G_STATIC_ASSERT (sizeof (SpCaptureFrameCounterDefine) == 32);
+G_STATIC_ASSERT (sizeof (SpCaptureFrameCounterSet) == 32);
+G_STATIC_ASSERT (sizeof (SpCaptureMark) == 96);
+
+static inline gint
+sp_capture_address_compare (SpCaptureAddress a,
+                            SpCaptureAddress b)
+{
+  if (a < b)
+    return -1;
+  if (a > b)
+    return 1;
+  else
+    return 0;
+}
+
+G_END_DECLS
+
+#endif /* SP_CAPTURE_FORMAT_H */
+

gdk/capture/sp-capture-writer.h

@@ -0,0 +1,132 @@
+/* sp-capture-writer.h
+ *
+ * Copyright © 2016 Christian Hergert <chergert@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SP_CAPTURE_WRITER_H
+#define SP_CAPTURE_WRITER_H
+
+#include "capture/sp-capture-types.h"
+
+G_BEGIN_DECLS
+
+typedef struct _SpCaptureWriter SpCaptureWriter;
+
+typedef struct
+{
+  /*
+   * The number of frames indexed by SpCaptureFrameType
+   */
+  gsize frame_count[16];
+
+  /*
+   * Padding for future expansion.
+   */
+  gsize padding[48];
+} SpCaptureStat;
+
+SpCaptureWriter    *sp_capture_writer_new             (const gchar             *filename,
+                                                       gsize                    buffer_size);
+SpCaptureWriter    *sp_capture_writer_new_from_fd     (int                      fd,
+                                                       gsize                    buffer_size);
+SpCaptureWriter    *sp_capture_writer_ref             (SpCaptureWriter         *self);
+void                sp_capture_writer_unref           (SpCaptureWriter         *self);
+void                sp_capture_writer_stat            (SpCaptureWriter         *self,
+                                                       SpCaptureStat           *stat);
+gboolean            sp_capture_writer_add_map         (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       guint64                  start,
+                                                       guint64                  end,
+                                                       guint64                  offset,
+                                                       guint64                  inode,
+                                                       const gchar             *filename);
+gboolean            sp_capture_writer_add_mark        (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       guint64                  duration,
+                                                       const gchar             *group,
+                                                       const gchar             *name,
+                                                       const gchar             *message);
+guint64             sp_capture_writer_add_jitmap      (SpCaptureWriter         *self,
+                                                       const gchar             *name);
+gboolean            sp_capture_writer_add_process     (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       const gchar             *cmdline);
+gboolean            sp_capture_writer_add_sample      (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       const SpCaptureAddress  *addrs,
+                                                       guint                    n_addrs);
+gboolean            sp_capture_writer_add_fork        (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       GPid                     child_pid);
+gboolean            sp_capture_writer_add_exit        (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid);
+gboolean            sp_capture_writer_add_timestamp   (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid);
+gboolean            sp_capture_writer_define_counters (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       const SpCaptureCounter  *counters,
+                                                       guint                    n_counters);
+gboolean            sp_capture_writer_set_counters    (SpCaptureWriter         *self,
+                                                       gint64                   time,
+                                                       gint                     cpu,
+                                                       GPid                     pid,
+                                                       const guint             *counters_ids,
+                                                       const SpCaptureCounterValue *values,
+                                                       guint                    n_counters);
+gboolean            sp_capture_writer_flush           (SpCaptureWriter         *self);
+gboolean            sp_capture_writer_save_as         (SpCaptureWriter         *self,
+                                                       const gchar             *filename,
+                                                       GError                 **error);
+gint                sp_capture_writer_request_counter (SpCaptureWriter         *self,
+                                                       guint                    n_counters);
+SpCaptureReader    *sp_capture_writer_create_reader   (SpCaptureWriter         *self,
+                                                       GError                 **error);
+gboolean            sp_capture_writer_splice          (SpCaptureWriter         *self,
+                                                       SpCaptureWriter         *dest,
+                                                       GError                 **error);
+gboolean            _sp_capture_writer_splice_from_fd (SpCaptureWriter         *self,
+                                                       int                      fd,
+                                                       GError                 **error) G_GNUC_INTERNAL;
+
+#ifndef SP_DISABLE_GOBJECT
+# define SP_TYPE_CAPTURE_WRITER (sp_capture_writer_get_type())
+  GType sp_capture_writer_get_type (void);
+#endif
+
+#if GLIB_CHECK_VERSION(2, 44, 0)
+  G_DEFINE_AUTOPTR_CLEANUP_FUNC (SpCaptureWriter, sp_capture_writer_unref)
+#endif
+
+G_END_DECLS
+
+#endif /* SP_CAPTURE_WRITER_H */
+

gdk/capture/sp-clock.c

@@ -0,0 +1,52 @@
+/* sp-clock.c
+ *
+ * Copyright © 2016 Christian Hergert <chergert@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "sp-clock.h"
+
+gint sp_clock = -1;
+
+void
+sp_clock_init (void)
+{
+  static const gint clock_ids[] = {
+    CLOCK_MONOTONIC_RAW,
+    CLOCK_MONOTONIC_COARSE,
+    CLOCK_MONOTONIC,
+    CLOCK_REALTIME_COARSE,
+    CLOCK_REALTIME,
+  };
+  guint i;
+
+  if (sp_clock != -1)
+    return;
+
+  for (i = 0; i < G_N_ELEMENTS (clock_ids); i++)
+    {
+      struct timespec ts;
+      int clock_id = clock_ids [i];
+
+      if (0 == clock_gettime (clock_id, &ts))
+        {
+          sp_clock = clock_id;
+          return;
+        }
+    }
+
+  g_assert_not_reached ();
+}
+

gdk/capture/sp-clock.h

@@ -0,0 +1,55 @@
+/* sp-clock.h
+ *
+ * Copyright © 2016 Christian Hergert <chergert@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SP_CLOCK_H
+#define SP_CLOCK_H
+
+#include <glib.h>
+#include <time.h>
+
+G_BEGIN_DECLS
+
+typedef gint SpClock;
+typedef gint64 SpTimeStamp;
+typedef gint32 SpTimeSpan;
+
+extern SpClock sp_clock;
+
+static inline SpTimeStamp
+sp_clock_get_current_time (void)
+{
+  struct timespec ts;
+
+  clock_gettime (sp_clock, &ts);
+
+  return (ts.tv_sec * G_GINT64_CONSTANT (1000000000)) + ts.tv_nsec;
+}
+
+static inline SpTimeSpan
+sp_clock_get_relative_time (SpTimeStamp epoch)
+{
+  return sp_clock_get_current_time () - epoch;
+}
+
+void sp_clock_init (void);
+
+G_END_DECLS
+
+#endif /* SP_CLOCK_H */
+
+

gdk/gdk.c

@@ -27,6 +27,7 @@
 #include "gdkversionmacros.h"
 #include "gdkmain.h"
 
+#include "gdkprofiler.h"
 #include "gdkinternals.h"
 #include "gdkintl.h"
 
@@ -311,6 +312,9 @@ gdk_pre_parse (void)
       _gdk_debug_flags = g_parse_debug_string (debug_string,
                                               (GDebugKey *) gdk_debug_keys,
                                               G_N_ELEMENTS (gdk_debug_keys));
+
+    if (g_getenv ("GDK_TRACE"))
+      gdk_profiler_start (-1);
   }
 #endif  /* G_ENABLE_DEBUG */
 

gdk/gdkframeclockidle.c

@@ -28,6 +28,7 @@
 #include "gdkframeclockprivate.h"
 #include "gdkframeclockidle.h"
 #include "gdk.h"
+#include "gdkprofiler.h"
 
 #ifdef G_OS_WIN32
 #include <windows.h>
@@ -115,6 +116,96 @@ get_sleep_serial (void)
   return sleep_serial;
 }
 
+static guint fps_counter = 0;
+
+static void
+add_timings_to_profiler (GdkFrameTimings *timings)
+{
+  gdk_profiler_add_mark (timings->frame_time * 1000,
+                         (timings->frame_end_time - timings->frame_time) * 1000,
+                         "frame", "");
+  if (timings->layout_start_time != 0)
+    gdk_profiler_add_mark (timings->layout_start_time * 1000,
+                           (timings->paint_start_time - timings->layout_start_time) * 1000,
+                            "layout", "");
+
+  if (timings->paint_start_time != 0)
+    gdk_profiler_add_mark (timings->paint_start_time * 1000,
+                           (timings->frame_end_time - timings->paint_start_time) * 1000,
+                            "paint", "");
+}
+
+static gint64
+guess_refresh_interval (GdkFrameClock *frame_clock)
+{
+  gint64 interval;
+  gint64 i;
+
+  interval = G_MAXINT64;
+
+  for (i = gdk_frame_clock_get_history_start (frame_clock);
+       i < gdk_frame_clock_get_frame_counter (frame_clock);
+       i++)
+    {
+      GdkFrameTimings *t, *before;
+      gint64 ts, before_ts;
+
+      t = gdk_frame_clock_get_timings (frame_clock, i);
+      before = gdk_frame_clock_get_timings (frame_clock, i - 1);
+      if (t == NULL || before == NULL)
+        continue;
+
+      ts = gdk_frame_timings_get_frame_time (t);
+      before_ts = gdk_frame_timings_get_frame_time (before);
+      if (ts == 0 || before_ts == 0)
+        continue;
+
+      interval = MIN (interval, ts - before_ts);
+    }
+
+  if (interval == G_MAXINT64)
+    return 0;
+
+  return interval;
+}
+
+static double
+frame_clock_get_fps (GdkFrameClock *frame_clock)
+{
+  GdkFrameTimings *start, *end;
+  gint64 start_counter, end_counter;
+  gint64 start_timestamp, end_timestamp;
+  gint64 interval;
+
+  start_counter = gdk_frame_clock_get_history_start (frame_clock);
+  end_counter = gdk_frame_clock_get_frame_counter (frame_clock);
+  start = gdk_frame_clock_get_timings (frame_clock, start_counter);
+  for (end = gdk_frame_clock_get_timings (frame_clock, end_counter);
+       end_counter > start_counter && end != NULL && !gdk_frame_timings_get_complete (end);
+       end = gdk_frame_clock_get_timings (frame_clock, end_counter))
+    end_counter--;
+  if (end_counter - start_counter < 4)
+    return 0.0;
+
+  start_timestamp = gdk_frame_timings_get_presentation_time (start);
+  end_timestamp = gdk_frame_timings_get_presentation_time (end);
+  if (start_timestamp == 0 || end_timestamp == 0)
+    {
+      start_timestamp = gdk_frame_timings_get_frame_time (start);
+      end_timestamp = gdk_frame_timings_get_frame_time (end);
+    }
+
+  interval = gdk_frame_timings_get_refresh_interval (end);
+  if (interval == 0)
+    {
+      interval = guess_refresh_interval (frame_clock);
+      if (interval == 0)
+        return 0.0;
+    }
+
+  return ((double) end_counter - start_counter) * G_USEC_PER_SEC / (end_timestamp - start_timestamp);
+}
+
 static void
 gdk_frame_clock_idle_init (GdkFrameClockIdle *frame_clock_idle)
 {
@@ -125,6 +216,11 @@ gdk_frame_clock_idle_init (GdkFrameClockIdle *frame_clock_idle)
 
   priv->frame_time = g_get_monotonic_time (); /* more sane than zero */
   priv->freeze_count = 0;
+
+#ifdef G_ENABLE_DEBUG
+  if (fps_counter == 0)
+    fps_counter = gdk_profiler_define_counter ("fps", "Frames per Second");
+#endif
 }
 
 static void
@@ -415,7 +511,7 @@ gdk_frame_clock_paint_idle (void *data)
             {
 	      int iter;
 #ifdef G_ENABLE_DEBUG
-              if (GDK_DEBUG_CHECK (FRAMES))
+              if (GDK_DEBUG_CHECK (FRAMES) || gdk_profiler_is_running ())
                 {
                   if (priv->phase != GDK_FRAME_CLOCK_PHASE_LAYOUT &&
                       (priv->requested & GDK_FRAME_CLOCK_PHASE_LAYOUT))
@@ -444,7 +540,7 @@ gdk_frame_clock_paint_idle (void *data)
           if (priv->freeze_count == 0)
             {
 #ifdef G_ENABLE_DEBUG
-              if (GDK_DEBUG_CHECK (FRAMES))
+              if (GDK_DEBUG_CHECK (FRAMES) || gdk_profiler_is_running ())
                 {
                   if (priv->phase != GDK_FRAME_CLOCK_PHASE_PAINT &&
                       (priv->requested & GDK_FRAME_CLOCK_PHASE_PAINT))
@@ -470,7 +566,7 @@ gdk_frame_clock_paint_idle (void *data)
               priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
 
 #ifdef G_ENABLE_DEBUG
-              if (GDK_DEBUG_CHECK (FRAMES))
+              if (GDK_DEBUG_CHECK (FRAMES) || gdk_profiler_is_running ())
                 timings->frame_end_time = g_get_monotonic_time ();
 #endif /* G_ENABLE_DEBUG */
             }
@@ -481,6 +577,12 @@ gdk_frame_clock_paint_idle (void *data)
     }
 
 #ifdef G_ENABLE_DEBUG
+  if (gdk_profiler_is_running ())
+    {
+      add_timings_to_profiler (timings);
+      gdk_profiler_set_counter (fps_counter, timings->frame_end_time * 1000, frame_clock_get_fps (clock)); 
+    }
+
   if (GDK_DEBUG_CHECK (FRAMES))
     {
       if (timings && timings->complete)

gdk/gdkprofiler.c

@@ -0,0 +1,165 @@
+/* GDK - The GIMP Drawing Kit
+ *
+ * gdkprofiler.c: A simple profiler
+ *
+ * Copyright © 2018 Matthias Clasen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "capture/sp-capture-writer.h"
+#include "gdkprofiler.h"
+#include "gdkframeclockprivate.h"
+
+static SpCaptureWriter *writer = NULL;
+static gboolean running = FALSE;
+
+static void
+profiler_stop (void)
+{
+  if (writer)
+    sp_capture_writer_unref (writer);
+}
+
+void
+gdk_profiler_start (int fd)
+{
+  running = TRUE;
+
+  if (writer)
+    return;
+
+  sp_clock_init ();
+
+  if (fd == -1)
+    {
+      gchar *filename;
+
+      filename = g_strdup_printf ("gtk.%d.syscap", getpid ());
+      writer = sp_capture_writer_new (filename, 16*1024);
+      g_free (filename);
+    }
+  else
+    writer = sp_capture_writer_new_from_fd (fd, 16*1024);
+
+  atexit (profiler_stop);
+}
+
+void
+gdk_profiler_stop (void)
+{
+  running = FALSE;
+}
+
+gboolean
+gdk_profiler_is_running (void)
+{
+  return running;
+}
+
+void
+gdk_profiler_add_mark (gint64      start,
+                       guint64     duration,
+                       const char *name,
+                       const char *message)
+{
+  if (!running)
+    return;
+
+  sp_capture_writer_add_mark (writer,
+                              start,
+                              -1, getpid (),
+                              duration,
+                              "gtk", name, message);
+}
+
+static guint
+define_counter (const char *name,
+                const char *description,
+                int         type)
+{
+  SpCaptureCounter counter;
+
+  if (!writer)
+    return 0;
+
+  counter.id = (guint) sp_capture_writer_request_counter (writer, 1);
+  counter.type = type;
+  counter.value.vdbl = 0;
+  g_strlcpy (counter.category, "gtk", sizeof counter.category);
+  g_strlcpy (counter.name, name, sizeof counter.name);
+  g_strlcpy (counter.description, description, sizeof counter.name);
+
+  sp_capture_writer_define_counters (writer,
+                                     SP_CAPTURE_CURRENT_TIME,
+                                     -1,
+                                     getpid (),
+                                     &counter,
+                                     1);
+
+  return counter.id;
+}
+
+guint
+gdk_profiler_define_counter (const char *name,
+                             const char *description)
+{
+  return define_counter (name, description, SP_CAPTURE_COUNTER_DOUBLE);
+}
+
+guint
+gdk_profiler_define_int_counter (const char *name,
+                                 const char *description)
+{
+  return define_counter (name, description, SP_CAPTURE_COUNTER_INT64);
+}
+
+void
+gdk_profiler_set_counter (guint  id,
+                          gint64 time,
+                          double val)
+{
+  SpCaptureCounterValue value;
+
+  if (!running)
+    return;
+
+  value.vdbl = val;
+  sp_capture_writer_set_counters (writer,
+                                  time,
+                                  -1, getpid (),
+                                  &id, &value, 1);
+}
+
+void
+gdk_profiler_set_int_counter (guint  id,
+                              gint64 time,
+                              gint64 val)
+{
+  SpCaptureCounterValue value;
+
+  if (!running)
+    return;
+
+  value.v64 = val;
+  sp_capture_writer_set_counters (writer,
+                                  time,
+                                  -1, getpid (),
+                                  &id, &value, 1);
+}

gdk/gdkprofiler.h

@@ -0,0 +1,48 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2018 Red Hat, Inc. 
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GDK_PROFILER_H__
+#define __GDK_PROFILER_H__
+
+#include "gdk/gdkframeclock.h"
+#include "gdk/gdkdisplay.h"
+
+G_BEGIN_DECLS
+
+GDK_AVAILABLE_IN_ALL
+void     gdk_profiler_start      (int fd);
+GDK_AVAILABLE_IN_ALL
+void     gdk_profiler_stop       (void);
+gboolean gdk_profiler_is_running (void);
+void     gdk_profiler_add_mark   (gint64           start,
+                                  guint64          duration,
+                                  const char      *name,
+                                  const char      *message);
+guint    gdk_profiler_define_counter (const char *name,
+                                      const char *description);
+void     gdk_profiler_set_counter    (guint  id,
+                                      gint64 time,
+                                      double value);
+guint    gdk_profiler_define_int_counter (const char *name,
+                                          const char *description);
+void     gdk_profiler_set_int_counter (guint  id,
+                                       gint64 time,
+                                       gint64 value);
+
+G_END_DECLS
+
+#endif  /* __GDK_PROFILER_H__ */

gtk/gtkapplication.c

@@ -21,6 +21,9 @@
 #include "config.h"
 
 #include "gtkapplication.h"
+#include "gdkprofiler.h"
+#include <gio/gunixfdlist.h>
+
 
 #include <stdlib.h>
 
@@ -583,6 +586,121 @@ gtk_application_finalize (GObject *object)
   G_OBJECT_CLASS (gtk_application_parent_class)->finalize (object);
 }
 
+static const gchar org_gtk_Profiler_xml[] =
+  "<node>"
+    "<interface name='org.gtk.Profiler'>"
+      "<method name='Start'>"
+        "<arg type='h' name='fd' direction='in'/>"
+      "</method>"
+      "<method name='Stop'>"
+      "</method>"
+    "<property name='Version' type='u' access='read'/>"
+    "</interface>"
+  "</node>";
+
+static GDBusInterfaceInfo *org_gtk_Profiler;
+
+static void
+gtk_profiler_method_call (GDBusConnection       *connection,
+                          const gchar           *sender,
+                          const gchar           *object_path,
+                          const gchar           *interface_name,
+                          const gchar           *method_name,
+                          GVariant              *parameters,
+                          GDBusMethodInvocation *invocation,
+                          gpointer               user_data)
+{
+  if (strcmp (method_name, "Start") == 0)
+    {
+      GDBusMessage *message;
+      GUnixFDList *fd_list;
+      int fd = -1;
+      int idx;
+
+      g_variant_get (parameters, "(h)", &idx);
+
+      message = g_dbus_method_invocation_get_message (invocation);
+      fd_list = g_dbus_message_get_unix_fd_list (message);
+      if (fd_list)
+        fd = g_unix_fd_list_get (fd_list, idx, NULL);
+
+      gdk_profiler_start (fd);
+    }
+  else if (strcmp (method_name, "Stop") == 0)
+    {
+      gdk_profiler_stop ();
+    }
+  else
+    g_assert_not_reached ();
+
+  g_dbus_method_invocation_return_value (invocation, NULL);
+}
+
+static GVariant *
+gtk_profiler_get_property (GDBusConnection *connection,
+                           const gchar  *sender,
+                           const gchar  *object_path,
+                           const gchar  *interface_name,
+                           const gchar  *property_name,
+                           GError      **error,
+                           gpointer      user_data)
+{
+  if (strcmp (property_name, "Version") == 0)
+    return g_variant_new_uint32 (1);
+  else
+    g_assert_not_reached ();
+
+  return NULL;
+}
+
+
+static gboolean
+gtk_application_dbus_register (GApplication     *application,
+                               GDBusConnection  *connection,
+                               const char       *obect_path,
+                               GError          **error)
+{
+  GtkApplicationImplDBus *dbus = (GtkApplicationImplDBus *) application;
+  GDBusInterfaceVTable vtable = {
+    gtk_profiler_method_call,
+    gtk_profiler_get_property,
+    NULL
+  };
+
+  if (org_gtk_Profiler == NULL)
+    {
+      GDBusNodeInfo *info;
+
+      info = g_dbus_node_info_new_for_xml (org_gtk_Profiler_xml, error);
+      if (info == NULL)
+        return FALSE;
+
+      org_gtk_Profiler = g_dbus_node_info_lookup_interface (info, "org.gtk.Profiler");
+      g_dbus_interface_info_ref (org_gtk_Profiler);
+      g_dbus_node_info_unref (info);
+    }
+
+  dbus->profiler_id = g_dbus_connection_register_object (connection,
+                                                         "/org/gtk/Profiler",
+                                                         org_gtk_Profiler,
+                                                         &vtable,
+                                                         NULL,
+                                                         NULL,
+                                                         error);
+
+  return TRUE;
+}
+
+static void
+gtk_application_dbus_unregister (GApplication     *application,
+                                 GDBusConnection  *connection,
+                                 const char       *obect_path)
+{
+  GtkApplicationImplDBus *dbus = (GtkApplicationImplDBus *) application;
+
+  g_dbus_connection_unregister_object (connection, dbus->profiler_id);
+}
+
 static void
 gtk_application_class_init (GtkApplicationClass *class)
 {
@@ -599,6 +717,8 @@ gtk_application_class_init (GtkApplicationClass *class)
   application_class->after_emit = gtk_application_after_emit;
   application_class->startup = gtk_application_startup;
   application_class->shutdown = gtk_application_shutdown;
+  application_class->dbus_register = gtk_application_dbus_register;
+  application_class->dbus_unregister = gtk_application_dbus_unregister;
 
   class->window_added = gtk_application_window_added;
   class->window_removed = gtk_application_window_removed;

gtk/gtkapplicationprivate.h

@@ -124,6 +124,7 @@ typedef struct
 
   gchar           *menubar_path;
   guint            menubar_id;
+  guint            profiler_id;
 
   /* Session management... */
   GDBusProxy      *sm_proxy;