[rvm-commits] SF.net SVN: jikesrvm: [13632] rvmroot/trunk/rvm/src/org/jikesrvm/scheduler/ VM_ProcessorLock.java

[<cap...@us...>]

Revision: 13632
          http://jikesrvm.svn.sourceforge.net/jikesrvm/?rev=13632&view=rev
Author:   captain5050
Date:     2007-09-18 08:30:26 -0700 (Tue, 18 Sep 2007)

Log Message:
-----------
Insert pause on Intel when we detect microcontention, see RVM-218

Modified Paths:
--------------
    rvmroot/trunk/rvm/src/org/jikesrvm/scheduler/VM_ProcessorLock.java

Modified: rvmroot/trunk/rvm/src/org/jikesrvm/scheduler/VM_ProcessorLock.java
===================================================================
--- rvmroot/trunk/rvm/src/org/jikesrvm/scheduler/VM_ProcessorLock.java	2007-09-18 15:11:17 UTC (rev 13631)
+++ rvmroot/trunk/rvm/src/org/jikesrvm/scheduler/VM_ProcessorLock.java	2007-09-18 15:30:26 UTC (rev 13632)
@@ -218,7 +218,8 @@
    */
   @NoInline
   private static void handleMicrocontention(int n) {
-    if (n <= 0) return;                                  // method call overhead is delay enough
+    VM_Magic.pause();    // reduce overhead of spin wait on IA
+    if (n <= 0) return;  // method call overhead is delay enough
     if (n > 100) {
       VM.sysWriteln("Unexpectedly large processor lock contention");
       VM_Scheduler.dumpStack();


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