Add the superpage reservation system. This is "part 2 of 2" of the

machine-independent support for superpages.  (The earlier part was
the rewrite of the physical memory allocator.)  The remainder of the
code required for superpages support is machine-dependent and will
be added to the various pmap implementations at a later date.

Initially, I am only supporting one large page size per architecture.
Moreover, I am only enabling the reservation system on amd64.  (In
an emergency, it can be disabled by setting VM_NRESERVLEVELS to 0
in amd64/include/vmparam.h or your kernel configuration file.)

1 files changed, 13 insertions, 0 deletions

diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
index 49a4077..d2a8220 100644
--- a/sys/vm/vm_fault.c
+++ b/sys/vm/vm_fault.c
@@ -74,6 +74,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_vm.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
@@ -429,6 +431,13 @@ RetryFault:;
 			 */
 			fs.m = NULL;
 			if (!vm_page_count_severe()) {
+#if VM_NRESERVLEVEL > 0
+				if ((fs.object->flags & OBJ_COLORED) == 0) {
+					fs.object->flags |= OBJ_COLORED;
+					fs.object->pg_color = atop(vaddr) -
+					    fs.pindex;
+				}
+#endif
 				fs.m = vm_page_alloc(fs.object, fs.pindex,
 				    (fs.vp || fs.object->backing_object)? VM_ALLOC_NORMAL: VM_ALLOC_ZERO);
 			}
@@ -1107,6 +1116,10 @@ vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
 	 */
 	dst_object = vm_object_allocate(OBJT_DEFAULT,
 	    OFF_TO_IDX(dst_entry->end - dst_entry->start));
+#if VM_NRESERVLEVEL > 0
+	dst_object->flags |= OBJ_COLORED;
+	dst_object->pg_color = atop(dst_entry->start);
+#endif
 
 	VM_OBJECT_LOCK(dst_object);
 	dst_entry->object.vm_object = dst_object;