[PATCH 31/34] mm: cart-PG_reclaim3.patch

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Add a third PG_flag to the page reclaim framework.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>

---

 include/linux/page-flags.h |    1 +
 mm/hugetlb.c               |    3 ++-
 mm/page_alloc.c            |    3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

Index: linux-2.6-git/include/linux/page-flags.h
===================================================================
--- linux-2.6-git.orig/include/linux/page-flags.h
+++ linux-2.6-git/include/linux/page-flags.h
@@ -77,6 +77,7 @@
 #define PG_uncached		19	/* Page has been mapped as uncached */
 
 #define PG_reclaim2		20	/* reserved by the mm reclaim code */
+#define PG_reclaim3		21	/* reserved by the mm reclaim code */
 
 /*
  * Global page accounting.  One instance per CPU.  Only unsigned longs are
Index: linux-2.6-git/mm/page_alloc.c
===================================================================
--- linux-2.6-git.orig/mm/page_alloc.c
+++ linux-2.6-git/mm/page_alloc.c
@@ -151,6 +151,7 @@ static void bad_page(struct page *page)
 			1 << PG_locked	|
 			1 << PG_reclaim1 |
 			1 << PG_reclaim2 |
+			1 << PG_reclaim3 |
 			1 << PG_dirty	|
 			1 << PG_reclaim |
 			1 << PG_slab    |
@@ -363,6 +364,7 @@ static inline int free_pages_check(struc
 			1 << PG_locked	|
 			1 << PG_reclaim1 |
 			1 << PG_reclaim2 |
+			1 << PG_reclaim3 |
 			1 << PG_reclaim	|
 			1 << PG_slab	|
 			1 << PG_swapcache |
@@ -521,6 +523,7 @@ static int prep_new_page(struct page *pa
 			1 << PG_locked	|
 			1 << PG_reclaim1 |
 			1 << PG_reclaim2 |
+			1 << PG_reclaim3 |
 			1 << PG_dirty	|
 			1 << PG_reclaim	|
 			1 << PG_slab    |
Index: linux-2.6-git/mm/hugetlb.c
===================================================================
--- linux-2.6-git.orig/mm/hugetlb.c
+++ linux-2.6-git/mm/hugetlb.c
@@ -153,7 +153,8 @@ static void update_and_free_page(struct 
 	for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) {
 		page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced |
 				1 << PG_dirty | 1 << PG_reclaim1 | 1 << PG_reclaim2 |
-				1 << PG_reserved | 1 << PG_private | 1<< PG_writeback);
+				1 << PG_reclaim3 | 1 << PG_reserved | 1 << PG_private |
+				1<< PG_writeback);
 		set_page_count(&page[i], 0);
 	}
 	set_page_count(page, 1);
-
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