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Subject[PATCH 09/14] page-replace-reinsert.patch
Date

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

page-replace interface function:
page_replace_reinsert()

This function will reinsert those candidate pages that were not
freed by try_pageout().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

include/linux/mm_page_replace.h | 1 +
mm/page_replace.c | 29 +++++++++++++++++++++++++++++
mm/vmscan.c | 25 +------------------------
3 files changed, 31 insertions(+), 24 deletions(-)

Index: linux-2.6-git/include/linux/mm_page_replace.h
===================================================================
--- linux-2.6-git.orig/include/linux/mm_page_replace.h
+++ linux-2.6-git/include/linux/mm_page_replace.h
@@ -43,6 +43,7 @@ static inline void page_replace_activate
{
SetPageActive(page);
}
+void page_replace_reinsert(struct zone *, struct list_head *);

int isolate_lru_pages(int, struct list_head *, struct list_head *, int *);

Index: linux-2.6-git/mm/page_replace.c
===================================================================
--- linux-2.6-git.orig/mm/page_replace.c
+++ linux-2.6-git/mm/page_replace.c
@@ -1,6 +1,7 @@
#include <linux/mm_page_replace.h>
#include <linux/mm_inline.h>
#include <linux/swap.h>
+#include <linux/pagevec.h>


void __page_replace_insert(struct zone *zone, struct page *page)
@@ -78,3 +79,31 @@ void page_replace_candidates(struct zone
mod_page_state_zone(zone, pgscan_direct, nr_scan);
}

+/*
+ * Put back any unfreeable pages.
+ */
+void page_replace_reinsert(struct zone *zone, struct list_head *page_list)
+{
+ struct pagevec pvec;
+
+ pagevec_init(&pvec, 1);
+ spin_lock_irq(&zone->lru_lock);
+ while (!list_empty(page_list)) {
+ struct page *page = lru_to_page(page_list);
+ BUG_ON(PageLRU(page));
+ SetPageLRU(page);
+ list_del(&page->lru);
+ if (PageActive(page))
+ add_page_to_active_list(zone, page);
+ else
+ add_page_to_inactive_list(zone, page);
+ if (!pagevec_add(&pvec, page)) {
+ spin_unlock_irq(&zone->lru_lock);
+ __pagevec_release(&pvec);
+ spin_lock_irq(&zone->lru_lock);
+ }
+ }
+ spin_unlock_irq(&zone->lru_lock);
+ pagevec_release(&pvec);
+}
+
Index: linux-2.6-git/mm/vmscan.c
===================================================================
--- linux-2.6-git.orig/mm/vmscan.c
+++ linux-2.6-git/mm/vmscan.c
@@ -573,8 +573,6 @@ static int shrink_list(struct list_head
static void shrink_cache(struct zone *zone, struct scan_control *sc)
{
LIST_HEAD(page_list);
- struct pagevec pvec;
- struct page *page;
int nr_freed;

lru_add_drain();
@@ -589,28 +587,7 @@ static void shrink_cache(struct zone *zo
mod_page_state_zone(zone, pgsteal, nr_freed);
sc->nr_to_reclaim -= nr_freed;

- /*
- * Put back any unfreeable pages.
- */
- pagevec_init(&pvec, 1);
- spin_lock_irq(&zone->lru_lock);
- while (!list_empty(&page_list)) {
- page = lru_to_page(&page_list);
- if (TestSetPageLRU(page))
- BUG();
- list_del(&page->lru);
- if (PageActive(page))
- add_page_to_active_list(zone, page);
- else
- add_page_to_inactive_list(zone, page);
- if (!pagevec_add(&pvec, page)) {
- spin_unlock_irq(&zone->lru_lock);
- __pagevec_release(&pvec);
- spin_lock_irq(&zone->lru_lock);
- }
- }
- spin_unlock_irq(&zone->lru_lock);
- pagevec_release(&pvec);
+ page_replace_reinsert(zone, &page_list);
}

/*
-
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