Applied patch by Rene Gollent:

* Add a cached_pages field to the system_info structure, and change the
  meaning of the used_pages field to not include cached pages.
* Provide the needed info using the new calls vm_get_available_memory(),
  and vm_page_num_available_pages().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24571 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/OS.h

@@ -657,7 +657,8 @@ typedef struct {
 	int64			kernel_version;             			/* version of this kernel */
 
 	bigtime_t		_busy_wait_time;			/* reserved for whatever */
-	int32			pad[4];   	               	/* just in case... */
+	int32			cached_pages;
+	int32			pad[3];   	               	/* just in case... */
 } system_info;
 
 /* system private, use macro instead */