--- 2.2.18pre15/include/linux/mm.h.~1~	Fri Oct 20 01:35:46 2000
+++ 2.2.18pre15/include/linux/mm.h	Fri Oct 20 20:55:37 2000
@@ -81,6 +81,8 @@
 #define VM_LOCKED	0x2000
 #define VM_IO           0x4000  /* Memory mapped I/O or similar */
 
+#define VM_RESERVED	0x8000	/* Don't unmap it from swap_out */
+
 #define VM_STACK_FLAGS	0x0177
 
 /*
--- 2.2.18pre15/include/linux/wrapper.h.~1~	Tue Feb  1 18:24:19 2000
+++ 2.2.18pre15/include/linux/wrapper.h	Fri Oct 20 20:56:52 2000
@@ -33,6 +33,14 @@
 #define vma_get_end(v) v->vm_end
 #define vma_get_page_prot(v) v->vm_page_prot
 
+/*
+ * mem_map_reserve()/unreserve() are going to be obsoleted by
+ * setting the VM_RESERVED in vma->vm_flags.
+ *
+ * Instead of marking the pages as reserved, just mark the vma as reserved
+ * this will improve performance (it's zero cost unlike the PG_reserved check)
+ * and it will be trivial for not physically contigous mappings too.
+ */
 #define mem_map_reserve(p) set_bit(PG_reserved, &mem_map[p].flags)
 #define mem_map_unreserve(p) clear_bit(PG_reserved, &mem_map[p].flags)
 #define mem_map_inc_count(p) atomic_inc(&(mem_map[p].count))
--- 2.2.18pre15/mm/vmscan.c.~1~	Tue Sep  5 02:28:50 2000
+++ 2.2.18pre15/mm/vmscan.c	Fri Oct 20 20:57:19 2000
@@ -251,7 +251,7 @@
 	unsigned long end;
 
 	/* Don't swap out areas which are locked down */
-	if (vma->vm_flags & VM_LOCKED)
+	if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
 		return 0;
 
 	pgdir = pgd_offset(tsk->mm, address);