[sgen] Add scan/copy context for the simple parallel nursery

[mono.git] / mono / sgen / sgen-minor-scan-object.h

diff --git a/mono/sgen/sgen-minor-scan-object.h b/mono/sgen/sgen-minor-scan-object.h
index 2c357c3c9524c7d3e06b90cfb0aa354918f6e669..b92d309f4ec1228d02086deb5d856902459c94cc 100644 (file)
--- a/mono/sgen/sgen-minor-scan-object.h
+++ b/mono/sgen/sgen-minor-scan-object.h
@@ -1,5 +1,6 @@
-/*
- * sgen-minor-scan-object.h: Object scanning in the nursery collectors.
+/**
+ * \file
+ * Object scanning in the nursery collectors.
  *
  * Copyright 2001-2003 Ximian, Inc
  * Copyright 2003-2010 Novell, Inc.
@@ -17,6 +18,12 @@ extern guint64 stat_scan_object_called_nursery;
 
 #if defined(SGEN_SIMPLE_NURSERY)
 
+#ifdef SGEN_SIMPLE_PAR_NURSERY
+#define SERIAL_SCAN_OBJECT simple_par_nursery_serial_scan_object
+#define SERIAL_SCAN_VTYPE simple_par_nursery_serial_scan_vtype
+#define SERIAL_SCAN_PTR_FIELD simple_par_nursery_serial_scan_ptr_field
+#define SERIAL_DRAIN_GRAY_STACK simple_par_nursery_serial_drain_gray_stack
+#else
 #ifdef SGEN_CONCURRENT_MAJOR
 #define SERIAL_SCAN_OBJECT simple_nursery_serial_with_concurrent_major_scan_object
 #define SERIAL_SCAN_VTYPE simple_nursery_serial_with_concurrent_major_scan_vtype
@@ -28,6 +35,7 @@ extern guint64 stat_scan_object_called_nursery;
 #define SERIAL_SCAN_PTR_FIELD simple_nursery_serial_scan_ptr_field
 #define SERIAL_DRAIN_GRAY_STACK simple_nursery_serial_drain_gray_stack
 #endif
+#endif
 
 #elif defined (SGEN_SPLIT_NURSERY)
 
@@ -103,16 +111,31 @@ SERIAL_SCAN_PTR_FIELD (GCObject *full_object, GCObject **ptr, SgenGrayQueue *que
 static gboolean
 SERIAL_DRAIN_GRAY_STACK (SgenGrayQueue *queue)
 {
-        for (;;) {
-                GCObject *obj;
-                SgenDescriptor desc;
+#ifdef SGEN_SIMPLE_PAR_NURSERY
+       int i;
+       /*
+        * We do bounded iteration so we can switch to optimized context
+        * when we are the last worker remaining.
+        */
+       for (i = 0; i < 32; i++) {
+#else
+       for (;;) {
+#endif
+               GCObject *obj;
+               SgenDescriptor desc;
+
+#ifdef SGEN_SIMPLE_PAR_NURSERY
+               GRAY_OBJECT_DEQUEUE_PARALLEL (queue, &obj, &desc);
+#else
+               GRAY_OBJECT_DEQUEUE_SERIAL (queue, &obj, &desc);
+#endif
+               if (!obj)
+                       return TRUE;
 
-                GRAY_OBJECT_DEQUEUE_SERIAL (queue, &obj, &desc);
-                if (!obj)
-                        return TRUE;
+               SERIAL_SCAN_OBJECT (obj, desc, queue);
+       }
 
-                SERIAL_SCAN_OBJECT (obj, desc, queue);
-        }
+       return FALSE;
 }
 
 #define FILL_MINOR_COLLECTOR_SCAN_OBJECT(ops)  do {                    \