diff --git a/src/libsysprof-capture/sysprof-collector.c b/src/libsysprof-capture/sysprof-collector.c
index 7e2281c6..916b88e0 100644
--- a/src/libsysprof-capture/sysprof-collector.c
+++ b/src/libsysprof-capture/sysprof-collector.c
@@ -116,10 +116,10 @@ _do_getcpu (void)
 #endif
 }
 
-static inline void
-_realign (gsize *pos)
+static inline gsize
+realign (gsize size)
 {
-  *pos = (*pos + SYSPROF_CAPTURE_ALIGN - 1) & ~(SYSPROF_CAPTURE_ALIGN - 1);
+  return (size + SYSPROF_CAPTURE_ALIGN - 1) & ~(SYSPROF_CAPTURE_ALIGN - 1);
 }
 
 static MappedRingBuffer *
@@ -372,3 +372,85 @@ sysprof_collector_sample (SysprofBacktraceFunc backtrace_func,
 
   } COLLECTOR_END;
 }
+
+void
+sysprof_collector_mark (gint64       time,
+                        gint64       duration,
+                        const gchar *group,
+                        const gchar *mark,
+                        const gchar *message)
+{
+  COLLECTOR_BEGIN {
+    SysprofCaptureMark *ev;
+    gsize len;
+    gsize sl;
+
+    if (group == NULL)
+      group = "";
+
+    if (mark == NULL)
+      mark = "";
+
+    if (message == NULL)
+      message = "";
+
+    sl = strlen (message);
+    len = realign (sizeof *ev + sl + 1);
+
+    if ((ev = mapped_ring_buffer_allocate (collector->buffer, len)))
+      {
+        ev->frame.len = len;
+        ev->frame.type = SYSPROF_CAPTURE_FRAME_MARK;
+        ev->frame.cpu = _do_getcpu ();
+        ev->frame.pid = collector->pid;
+        ev->frame.time = time;
+        ev->duration = duration;
+        g_strlcpy (ev->group, group, sizeof ev->group);
+        g_strlcpy (ev->name, message, sizeof ev->name);
+        memcpy (ev->message, message, sl);
+        ev->message[sl] = 0;
+
+        mapped_ring_buffer_advance (collector->buffer, ev->frame.len);
+      }
+
+  } COLLECTOR_END;
+}
+
+void
+sysprof_collector_log (GLogLevelFlags  severity,
+                       const gchar    *domain,
+                       const gchar    *message)
+{
+  COLLECTOR_BEGIN {
+    SysprofCaptureLog *ev;
+    gsize len;
+    gsize sl;
+
+    if (domain == NULL)
+      domain = "";
+
+    if (message == NULL)
+      message = "";
+
+    sl = strlen (message);
+    len = realign (sizeof *ev + sl + 1);
+
+    if ((ev = mapped_ring_buffer_allocate (collector->buffer, len)))
+      {
+        ev->frame.len = len;
+        ev->frame.type = SYSPROF_CAPTURE_FRAME_LOG;
+        ev->frame.cpu = _do_getcpu ();
+        ev->frame.pid = collector->pid;
+        ev->frame.time = SYSPROF_CAPTURE_CURRENT_TIME;
+        ev->severity = severity & 0xFFFF;
+        ev->padding1 = 0;
+        ev->padding2 = 0;
+        g_strlcpy (ev->domain, domain, sizeof ev->domain);
+        memcpy (ev->message, message, sl);
+        ev->message[sl] = 0;
+
+        mapped_ring_buffer_advance (collector->buffer, ev->frame.len);
+      }
+
+  } COLLECTOR_END;
+}
diff --git a/src/libsysprof-capture/sysprof-collector.h b/src/libsysprof-capture/sysprof-collector.h
index 140eeb7b..6e1f9edc 100644
--- a/src/libsysprof-capture/sysprof-collector.h
+++ b/src/libsysprof-capture/sysprof-collector.h
@@ -62,14 +62,24 @@
 G_BEGIN_DECLS
 
 SYSPROF_AVAILABLE_IN_3_36
-void                  sysprof_collector_init             (void);
+void sysprof_collector_init     (void);
 SYSPROF_AVAILABLE_IN_3_36
-void                  sysprof_collector_allocate         (SysprofCaptureAddress             alloc_addr,
-                                                          gint64                            alloc_size,
-                                                          SysprofBacktraceFunc              backtrace_func,
-                                                          gpointer                          backtrace_data);
+void sysprof_collector_allocate (SysprofCaptureAddress  alloc_addr,
+                                 gint64                 alloc_size,
+                                 SysprofBacktraceFunc   backtrace_func,
+                                 gpointer               backtrace_data);
 SYSPROF_AVAILABLE_IN_3_36
-void                  sysprof_collector_sample           (SysprofBacktraceFunc              backtrace_func,
-                                                          gpointer                          backtrace_data);
+void sysprof_collector_sample   (SysprofBacktraceFunc   backtrace_func,
+                                 gpointer               backtrace_data);
+SYSPROF_AVAILABLE_IN_3_36
+void sysprof_collector_mark     (gint64                 time,
+                                 gint64                 duration,
+                                 const gchar           *group,
+                                 const gchar           *mark,
+                                 const gchar           *message);
+SYSPROF_AVAILABLE_IN_3_36
+void sysprof_collector_log      (GLogLevelFlags         severity,
+                                 const gchar           *domain,
+                                 const gchar           *message);
 
 G_END_DECLS