Add memory advice attribute to memory object and entry.

* include/mach/vm_advice.h: New file with some definitions used for making
memory advice.
(vm_advice_t): Enumeration that is used to denote memory advice.
(VM_ADVICE_MAX_READAHEAD): New macro, that denotes maximal size of cluster
to be read.
(struct vm_advice_entry): Structure that keeps number of pages to be read
before and after the page where fault occurred for some specific memory
advice.

* Makefrag.am (include_mach_HEADERS): Add file vm_advice.h.

* include/mach/mach_types.h: Include header mach/vm_advice.h.

* vm/vm_map.h: Include mach/vm_advice.h.
(struct vm_map_entry): Add advice to map entry attributes.

* vm/vm_map.c (vm_map_find_entry): Add advice to new entry template.
(vm_map_enter): Likewise.

* vm/vm_object.h: Include mach/vm_advice.h.
(struct vm_object): Add advice to memory object attributes.

* vm/vm_object.c (vm_object_bootstrap): Add advice to object template.

2 files changed, 53 insertions, 0 deletions

diff --git a/include/mach/mach_types.h b/include/mach/mach_types.h
index f6ceac3b..7b5548b2 100644
--- a/include/mach/mach_types.h
+++ b/include/mach/mach_types.h
@@ -50,6 +50,7 @@
 #include <mach/time_value.h>
 #include <mach/vm_attributes.h>
 #include <mach/vm_inherit.h>
+#include <mach/vm_advice.h>
 #include <mach/vm_prot.h>
 #include <mach/vm_statistics.h>
 
diff --git a/include/mach/vm_advice.h b/include/mach/vm_advice.h
new file mode 100644
index 00000000..47b43a62
--- /dev/null
+++ b/include/mach/vm_advice.h
@@ -0,0 +1,52 @@
+/*
+ * Mach Operating System
+ * Copyright (c) 2012 Free Software Foundation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+/*
+ *	File:	mach/vm_advice.h
+ *	Author:	Maksym Planeta
+ *
+ *	Virtual memory map advice definitions.
+ *
+ */
+
+#ifndef	_MACH_VM_ADVICE_H_
+#define	_MACH_VM_ADVICE_H_
+
+/*
+ *	Types defined:
+ *
+ *	vm_advice_t	Enumeration of valid advice codes.
+ *	
+ */
+
+typedef enum {
+	VM_ADVICE_DEFAULT,
+	VM_ADVICE_RANDOM,
+	VM_ADVICE_SEQUENTIAL,
+	VM_ADVICE_NORMAL,
+	VM_ADVICE_KEEP
+} vm_advice_t;
+
+#define VM_ADVICE_MAX_READAHEAD 2
+
+struct vm_advice_entry {
+	vm_offset_t	read_before;
+	vm_offset_t	read_after;
+};
+
+#endif	/* _MACH_VM_ADVICE_H_ */