More sync to NetBSD.

The highlight is some more advices to madvise(2).
 o MADV_DONTNEED will deactive the pages in the given range giving a quicker
   reuse.
 o MADV_FREE will garbage-collect the pages and swap resources causing the
   next fault to either page in new pages from backing store (mapped vnode)
   or allocate new zero-fill pages (anonymous mapping).

1 files changed, 10 insertions, 1 deletions

diff --git a/sys/vm/vm_map.h b/sys/vm/vm_map.h
index 47107fec0e7..515c9ec378c 100644
--- a/sys/vm/vm_map.h
+++ b/sys/vm/vm_map.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_map.h,v 1.13 2001/05/10 07:59:06 art Exp $	*/
+/*	$OpenBSD: vm_map.h,v 1.14 2001/05/10 14:51:21 art Exp $	*/
 /*	$NetBSD: vm_map.h,v 1.11 1995/03/26 20:39:10 jtc Exp $	*/
 
 /* 
@@ -231,6 +231,15 @@ struct vm_map {
 #define	VM_MAP_BUSY		0x08		/* rw: map is busy */
 #define	VM_MAP_WANTLOCK		0x10		/* rw: want to write-lock */
 
+#ifdef _KERNEL
+#define	vm_map_modflags(map, set, clear)				\
+do {									\
+	simple_lock(&(map)->flags_lock);				\
+	(map)->flags = ((map)->flags | (set)) & ~(clear);		\
+	simple_unlock(&(map)->flags_lock);				\
+} while (0)
+#endif /* _KERNEL */
+
 /*
  *     Interrupt-safe maps must also be kept on a special list,
  *     to assist uvm_fault() in avoiding locking problems.