diff --git a/src/libsysprof-profile/sysprof-instrument-private.h b/src/libsysprof-profile/sysprof-instrument-private.h
index b5ceb73c..f8a4d9df 100644
--- a/src/libsysprof-profile/sysprof-instrument-private.h
+++ b/src/libsysprof-profile/sysprof-instrument-private.h
@@ -44,14 +44,20 @@ struct _SysprofInstrumentClass
   DexFuture  *(*record)               (SysprofInstrument *self,
                                        SysprofRecording  *recording,
                                        GCancellable      *cancellable);
+  DexFuture  *(*process_started)      (SysprofInstrument *self,
+                                       SysprofRecording  *recording,
+                                       int                pid);
 };
 
-DexFuture *_sysprof_instruments_acquire_policy (GPtrArray        *instruments,
-                                                SysprofRecording *recording);
-DexFuture *_sysprof_instruments_prepare        (GPtrArray        *instruments,
-                                                SysprofRecording *recording);
-DexFuture *_sysprof_instruments_record         (GPtrArray        *instruments,
-                                                SysprofRecording *recording,
-                                                GCancellable     *cancellable);
+DexFuture *_sysprof_instruments_acquire_policy  (GPtrArray        *instruments,
+                                                 SysprofRecording *recording);
+DexFuture *_sysprof_instruments_prepare         (GPtrArray        *instruments,
+                                                 SysprofRecording *recording);
+DexFuture *_sysprof_instruments_record          (GPtrArray        *instruments,
+                                                 SysprofRecording *recording,
+                                                 GCancellable     *cancellable);
+DexFuture *_sysprof_instruments_process_started (GPtrArray        *instruments,
+                                                 SysprofRecording *recording,
+                                                 int               pid);
 
 G_END_DECLS
diff --git a/src/libsysprof-profile/sysprof-instrument.c b/src/libsysprof-profile/sysprof-instrument.c
index 242f8bf3..37eba55d 100644
--- a/src/libsysprof-profile/sysprof-instrument.c
+++ b/src/libsysprof-profile/sysprof-instrument.c
@@ -174,6 +174,7 @@ _sysprof_instruments_record (GPtrArray        *instruments,
 
   g_return_val_if_fail (instruments != NULL, NULL);
   g_return_val_if_fail (SYSPROF_IS_RECORDING (recording), NULL);
+  g_return_val_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable), NULL);
 
   futures = g_ptr_array_new_with_free_func (dex_unref);
 
@@ -190,3 +191,32 @@ _sysprof_instruments_record (GPtrArray        *instruments,
 
   return dex_future_allv ((DexFuture **)futures->pdata, futures->len);
 }
+
+DexFuture *
+_sysprof_instruments_process_started (GPtrArray        *instruments,
+                                      SysprofRecording *recording,
+                                      int               pid)
+{
+  g_autoptr(GPtrArray) futures = NULL;
+
+  g_return_val_if_fail (instruments != NULL, NULL);
+  g_return_val_if_fail (SYSPROF_IS_RECORDING (recording), NULL);
+
+  futures = g_ptr_array_new_with_free_func (dex_unref);
+
+  for (guint i = 0; i < instruments->len; i++)
+    {
+      SysprofInstrument *instrument = g_ptr_array_index (instruments, i);
+
+      if (SYSPROF_INSTRUMENT_GET_CLASS (instruments)->process_started == NULL)
+        continue;
+
+      g_ptr_array_add (futures,
+                       SYSPROF_INSTRUMENT_GET_CLASS (instrument)->process_started (instrument, recording, pid));
+    }
+
+  if (futures->len == 0)
+    return dex_future_new_for_boolean (TRUE);
+
+  return dex_future_allv ((DexFuture **)futures->pdata, futures->len);
+}