[PATCH 16/34] mm: page-replace-init.patch

[Peter Zijlstra]

From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>

Move initialization of the replacement policy's variables into the
implementation.

API:

initialize the implementation's per zone variables

	void page_replace_init_zone(struct zone *);

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Marcelo Tosatti <marcelo.tosatti@xxxxxxxxxxxx>

---

 include/linux/mm_page_replace.h |    2 ++
 init/main.c                     |    2 ++
 mm/useonce.c                        |   15 +++++++++++++++
 mm/page_alloc.c                 |    8 ++------
 4 files changed, 21 insertions(+), 6 deletions(-)

Index: linux-2.6/include/linux/mm_page_replace.h
===================================================================
--- linux-2.6.orig/include/linux/mm_page_replace.h	2006-03-13 20:37:39.000000000 +0100
+++ linux-2.6/include/linux/mm_page_replace.h	2006-03-13 20:37:40.000000000 +0100
@@ -67,6 +67,8 @@ struct scan_control {
 #define prefetchw_prev_lru_page(_page, _base, _field) do { } while (0)
 #endif
 
+extern void page_replace_init(void);
+extern void page_replace_init_zone(struct zone *);
 /* void page_replace_hint_active(struct page *); */
 /* void page_replace_hint_use_once(struct page *); */
 extern void fastcall page_replace_add(struct page *);
Index: linux-2.6/mm/useonce.c
===================================================================
--- linux-2.6.orig/mm/useonce.c	2006-03-13 20:37:38.000000000 +0100
+++ linux-2.6/mm/useonce.c	2006-03-13 20:37:40.000000000 +0100
@@ -6,6 +6,21 @@
 #include <linux/buffer_head.h>	/* for try_to_release_page(),
 					buffer_heads_over_limit */
 
+void __init page_replace_init(void)
+{
+	/* empty hook */
+}
+
+void __init page_replace_init_zone(struct zone *zone)
+{
+	INIT_LIST_HEAD(&zone->active_list);
+	INIT_LIST_HEAD(&zone->inactive_list);
+	zone->nr_scan_active = 0;
+	zone->nr_scan_inactive = 0;
+	zone->nr_active = 0;
+	zone->nr_inactive = 0;
+}
+
 static inline void
 add_page_to_inactive_list(struct zone *zone, struct page *page)
 {
Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2006-03-13 20:37:05.000000000 +0100
+++ linux-2.6/mm/page_alloc.c	2006-03-13 20:37:40.000000000 +0100
@@ -37,6 +37,7 @@
 #include <linux/nodemask.h>
 #include <linux/vmalloc.h>
 #include <linux/mempolicy.h>
+#include <linux/mm_page_replace.h>
 
 #include <asm/tlbflush.h>
 #include "internal.h"
@@ -2075,12 +2076,7 @@ static void __init free_area_init_core(s
 		zone->temp_priority = zone->prev_priority = DEF_PRIORITY;
 
 		zone_pcp_init(zone);
-		INIT_LIST_HEAD(&zone->active_list);
-		INIT_LIST_HEAD(&zone->inactive_list);
-		zone->nr_scan_active = 0;
-		zone->nr_scan_inactive = 0;
-		zone->nr_active = 0;
-		zone->nr_inactive = 0;
+		page_replace_init_zone(zone);
 		atomic_set(&zone->reclaim_in_progress, 0);
 		if (!size)
 			continue;
Index: linux-2.6/init/main.c
===================================================================
--- linux-2.6.orig/init/main.c	2006-03-13 20:37:05.000000000 +0100
+++ linux-2.6/init/main.c	2006-03-13 20:37:40.000000000 +0100
@@ -47,6 +47,7 @@
 #include <linux/rmap.h>
 #include <linux/mempolicy.h>
 #include <linux/key.h>
+#include <linux/mm_page_replace.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -507,6 +508,7 @@ asmlinkage void __init start_kernel(void
 #endif
 	vfs_caches_init_early();
 	cpuset_init_early();
+	page_replace_init();
 	mem_init();
 	kmem_cache_init();
 	setup_per_cpu_pageset();
-
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