kosaki	2011-06-30 02:43:58 +0900 (Thu, 30 Jun 2011)

  New Revision: 32303

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=32303

  Log:
    * thread.c (rb_thread_schedule_limits): minor optimization.
      eliminate machine context saving when running time is enough small.

  Modified files:
    trunk/ChangeLog
    trunk/thread.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 32302)
+++ ChangeLog	(revision 32303)
@@ -1,3 +1,8 @@
+Thu Jun 30 02:41:47 2011  KOSAKI Motohiro  <kosaki.motohiro@g...>
+
+	* thread.c (rb_thread_schedule_limits): minor optimization.
+	  eliminate machine context saving when running time is enough small.
+
 Thu Jun 30 02:28:11 2011  KOSAKI Motohiro  <kosaki.motohiro@g...>
 
 	* thread.c (rb_thread_schedule_rec): move interrupt_flag check to
Index: thread.c
===================================================================
--- thread.c	(revision 32302)
+++ thread.c	(revision 32303)
@@ -1008,15 +1008,13 @@
     if (!rb_thread_alone()) {
 	rb_thread_t *th = GET_THREAD();
 
-	thread_debug("rb_thread_schedule/switch start\n");
-
-	RB_GC_SAVE_MACHINE_CONTEXT(th);
-
-	if (th->running_time_us >= limits_us)
+	if (th->running_time_us >= limits_us) {
+	    thread_debug("rb_thread_schedule/switch start\n");
+	    RB_GC_SAVE_MACHINE_CONTEXT(th);
 	    gvl_yield(th->vm, th);
-
-	rb_thread_set_current(th);
-	thread_debug("rb_thread_schedule/switch done\n");
+	    rb_thread_set_current(th);
+	    thread_debug("rb_thread_schedule/switch done\n");
+	}
     }
 }
 

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