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, 59 insertions, 0 deletions

diff --git a/sys/vm/vm_reserv.h b/sys/vm/vm_reserv.h
new file mode 100644
index 0000000..7cf814b
--- /dev/null
+++ b/sys/vm/vm_reserv.h
@@ -0,0 +1,59 @@
+/*-
+ * Copyright (c) 2002-2006 Rice University
+ * Copyright (c) 2007 Alan L. Cox <alc@cs.rice.edu>
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by Alan L. Cox,
+ * Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ *	Superpage reservation management definitions
+ */
+
+#ifndef	_VM_RESERV_H_
+#define	_VM_RESERV_H_
+
+#ifdef _KERNEL
+
+#if VM_NRESERVLEVEL > 0
+
+vm_page_t	vm_reserv_alloc_page(vm_object_t object, vm_pindex_t pindex);
+void		vm_reserv_break_all(vm_object_t object);
+boolean_t	vm_reserv_free_page(vm_page_t m);
+void		vm_reserv_init(void);
+int		vm_reserv_level_iffullpop(vm_page_t m);
+boolean_t	vm_reserv_reactivate_page(vm_page_t m);
+boolean_t	vm_reserv_reclaim(void);
+void		vm_reserv_rename(vm_page_t m, vm_object_t new_object,
+		    vm_object_t old_object, vm_pindex_t old_object_offset);
+vm_paddr_t	vm_reserv_startup(vm_offset_t *vaddr, vm_paddr_t end,
+		    vm_paddr_t high_water);
+
+#endif	/* VM_NRESERVLEVEL > 0 */
+#endif	/* _KERNEL */
+#endif	/* !_VM_RESERV_H_ */