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Subject[PATCH -mm] vmscan: merge duplicate code in shrink_active_list()
The "move pages to active list" and "move pages to inactive list"
code blocks are mostly identical and can be served by a function.

Thanks to Andrew Morton for pointing this out.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
mm/vmscan.c | 84 ++++++++++++++++++++------------------------------
1 file changed, 35 insertions(+), 49 deletions(-)
--- linux.orig/mm/vmscan.c
+++ linux/mm/vmscan.c
@@ -1225,6 +1225,36 @@ static inline void note_zone_scanning_pr
* But we had to alter page->flags anyway.
*/

+void move_active_pages_to_lru(enum lru_list lru, struct list_head *list)
+{
+ unsigned long pgmoved = 0;
+
+ while (!list_empty(&list)) {
+ page = lru_to_page(&list);
+ prefetchw_prev_lru_page(page, &list, flags);
+
+ VM_BUG_ON(PageLRU(page));
+ SetPageLRU(page);
+
+ VM_BUG_ON(!PageActive(page));
+ if (lru < LRU_ACTIVE)
+ ClearPageActive(page);
+
+ list_move(&page->lru, &zone->lru[lru].list);
+ mem_cgroup_add_lru_list(page, lru);
+ pgmoved++;
+ if (!pagevec_add(&pvec, page)) {
+ spin_unlock_irq(&zone->lru_lock);
+ if (buffer_heads_over_limit)
+ pagevec_strip(&pvec);
+ __pagevec_release(&pvec);
+ spin_lock_irq(&zone->lru_lock);
+ }
+ }
+ __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
+ if (lru < LRU_ACTIVE)
+ __count_vm_events(PGDEACTIVATE, pgmoved);
+}

static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
struct scan_control *sc, int priority, int file)
@@ -1254,6 +1284,7 @@ static void shrink_active_list(unsigned
}
reclaim_stat->recent_scanned[!!file] += pgmoved;

+ __count_zone_vm_events(PGREFILL, zone, pgscanned);
if (file)
__mod_zone_page_state(zone, NR_ACTIVE_FILE, -pgmoved);
else
@@ -1293,65 +1324,20 @@ static void shrink_active_list(unsigned
}

/*
- * Move the pages to the [file or anon] inactive list.
+ * Move pages back to the lru list.
*/
pagevec_init(&pvec, 1);

spin_lock_irq(&zone->lru_lock);
/*
- * Count referenced pages from currently used mappings as
- * rotated, even though they are moved to the inactive list.
+ * Count referenced pages from currently used mappings as rotated.
* This helps balance scan pressure between file and anonymous
* pages in get_scan_ratio.
*/
reclaim_stat->recent_rotated[!!file] += pgmoved;

- pgmoved = 0; /* count pages moved to inactive list */
- lru = LRU_BASE + file * LRU_FILE;
- while (!list_empty(&l_inactive)) {
- page = lru_to_page(&l_inactive);
- prefetchw_prev_lru_page(page, &l_inactive, flags);
- VM_BUG_ON(PageLRU(page));
- SetPageLRU(page);
- VM_BUG_ON(!PageActive(page));
- ClearPageActive(page);
-
- list_move(&page->lru, &zone->lru[lru].list);
- mem_cgroup_add_lru_list(page, lru);
- pgmoved++;
- if (!pagevec_add(&pvec, page)) {
- spin_unlock_irq(&zone->lru_lock);
- if (buffer_heads_over_limit)
- pagevec_strip(&pvec);
- __pagevec_release(&pvec);
- spin_lock_irq(&zone->lru_lock);
- }
- }
- __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
- __count_zone_vm_events(PGREFILL, zone, pgscanned);
- __count_vm_events(PGDEACTIVATE, pgmoved);
-
- pgmoved = 0; /* count pages moved back to active list */
- lru = LRU_ACTIVE + file * LRU_FILE;
- while (!list_empty(&l_active)) {
- page = lru_to_page(&l_active);
- prefetchw_prev_lru_page(page, &l_active, flags);
- VM_BUG_ON(PageLRU(page));
- SetPageLRU(page);
- VM_BUG_ON(!PageActive(page));
-
- list_move(&page->lru, &zone->lru[lru].list);
- mem_cgroup_add_lru_list(page, lru);
- pgmoved++;
- if (!pagevec_add(&pvec, page)) {
- spin_unlock_irq(&zone->lru_lock);
- if (buffer_heads_over_limit)
- pagevec_strip(&pvec);
- __pagevec_release(&pvec);
- spin_lock_irq(&zone->lru_lock);
- }
- }
- __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
+ move_active_pages_to_lru(LRU_ACTIVE + file * LRU_FILE, &l_active);
+ move_active_pages_to_lru(LRU_BASE + file * LRU_FILE, &l_inactive);

spin_unlock_irq(&zone->lru_lock);
if (buffer_heads_over_limit)

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