OS-3088 need a lighterweight page invalidation mechanism for zone memcap

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
+ * Copyright 2014 Joyent, Inc.  All rights reserved.
  */
 
 /*
  * Implement fast getrusage call
  */

@@ -255,9 +256,22 @@
         case _RUSAGESYS_GETRUSAGE_LWP:
                 return (getrusage_lwp(arg1));
         case _RUSAGESYS_GETVMUSAGE:
                 return (vm_getusage((uint_t)(uintptr_t)arg1, (time_t)arg2,
                     (vmusage_t *)arg3, (size_t *)arg4, 0));
+        case _RUSAGESYS_INVALMAP:
+                /*
+                 * SPARC sfmmu hat does not support HAT_CURPROC_PGUNLOAD
+                 * handling so callers on SPARC should get simple sync
+                 * handling with invalidation to all processes.
+                 */
+#if defined(__sparc)
+                return (memcntl((caddr_t)arg2, (size_t)arg3, MC_SYNC,
+                    (caddr_t)(MS_ASYNC | MS_INVALIDATE), 0, 0));
+#else
+                return (vm_map_inval((pid_t)(uintptr_t)arg1, (caddr_t)arg2,
+                    (size_t)arg3));
+#endif
         default:
                 return (set_errno(EINVAL));
         }
 }