* gc.c: fix layout of rb_objsapce_t to improve cache locality.

newobj_of() accesses:
  (1) rb_objspace_t::flags
  (2) rb_objspace_t::eden_heap::freelist
  (3) and rb_objspace_t::eden_heap::free_pages if freelist is NULL.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47468 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,12 @@
+Tue Sep  9 14:21:50 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: fix layout of rb_objsapce_t to improve cache locality.
+
+	  newobj_of() accesses:
+	  (1) rb_objspace_t::flags
+	  (2) rb_objspace_t::eden_heap::freelist
+	  (3) and rb_objspace_t::eden_heap::free_pages if freelist is NULL.
+
 Tue Sep  9 14:09:36 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: move rb_objspace_t::flags::gc_stressfull after during_gc

gc.c

@@ -435,13 +435,14 @@ typedef struct mark_stack {
 } mark_stack_t;
 
 typedef struct rb_heap_struct {
-    struct heap_page *pages;
+    RVALUE *freelist;
+
     struct heap_page *free_pages;
     struct heap_page *using_page;
+    struct heap_page *pages;
     struct heap_page *sweep_pages;
     struct heap_page *pooled_pages;
 
-    RVALUE *freelist;
     size_t page_length;      /* total page count in a heap */
     size_t total_slots;      /* total slot count (page_length * HEAP_OBJ_LIMIT) */
 } rb_heap_t;
@@ -477,15 +478,15 @@ typedef struct rb_objspace {
 #endif
     } flags;
 
+    rb_heap_t eden_heap;
+    rb_heap_t tomb_heap; /* heap for zombies and ghosts */
+
     struct {
 	rb_atomic_t finalizing;
     } atomic_flags;
 
     size_t marked_objects;
 
-    rb_heap_t eden_heap;
-    rb_heap_t tomb_heap; /* heap for zombies and ghosts */
-
     struct {
 	struct heap_page **sorted;
 	size_t used;