[PATCH 2/8] Add container pointer on struct page

[Pavel Emelianov <xemul@sw.ru>]

Each page is supposed to have an owner - the container
that touched the page first. The owner stays alive during
the page lifetime even if the task that touched the page
dies or moves to another container.

This ownership is the forerunner for the "fair" page sharing
accounting, in which page has as may owners as it is really
used by.

diff -upr linux-2.6.20.orig/include/linux/mm.h linux-2.6.20-2/include/linux/mm.h
--- linux-2.6.20.orig/include/linux/mm.h	2007-03-06 19:09:50.000000000 +0300
+++ linux-2.6.20-2/include/linux/mm.h	2007-04-09 11:26:06.000000000 +0400
@@ -220,6 +220,12 @@ struct vm_operations_struct {
 struct mmu_gather;
 struct inode;
 
+#ifdef CONFIG_RSS_CONTAINER
+#define page_container(page)	(page->rss_container)
+#else
+#define page_container(page)	(NULL)
+#endif
+
 #define page_private(page)		((page)->private)
 #define set_page_private(page, v)	((page)->private = (v))
 
diff -upr linux-2.6.20.orig/include/linux/mm_types.h linux-2.6.20-2/include/linux/mm_types.h
--- linux-2.6.20.orig/include/linux/mm_types.h	2007-03-06 19:09:50.000000000 +0300
+++ linux-2.6.20-2/include/linux/mm_types.h	2007-04-09 11:26:06.000000000 +0400
@@ -62,6 +62,9 @@ struct page {
 	void *virtual;			/* Kernel virtual address (NULL if
 					   not kmapped, ie. highmem) */
 #endif /* WANT_PAGE_VIRTUAL */
+#ifdef CONFIG_RSS_CONTAINER
+	struct page_container *rss_container;
+#endif
 };
 
 #endif /* _LINUX_MM_TYPES_H */