PERFORCE change 146102 for review

[John Baldwin]

http://perforce.freebsd.org/chv.cgi?CH=146102

Change 146102 by jhb at jhb_zion on 2008/07/28 11:37:48

	- Just force a context switch at the user boundary for running threads
	  that are on an invalid CPU.
	- Handle running threads on other CPUs via an IPI_AST IPI.

Affected files ...

.. //depot/projects/smpng/sys/kern/sched_4bsd.c#79 edit

Differences ...

==== //depot/projects/smpng/sys/kern/sched_4bsd.c#79 (text+ko) ====

@@ -1621,7 +1621,9 @@
 		if (THREAD_CAN_SCHED(td, td->td_oncpu))
 			return;
 
-		mi_switch(SW_VOL, NULL);
+		td->td_flags |= TDF_NEEDRESCHED;	
+		if (td != curthread)
+			ipi_selected(1 << cpu, IPI_AST);
 		break;
 	default:
 		break;