Merge branch 'topic/asoc' into for-linus

1 files changed, 42 insertions, 82 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2880396f7953..c52b23552659 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -26,7 +26,6 @@
 #include <linux/buffer_head.h>  /* for try_to_release_page(),
                                         buffer_heads_over_limit */
 #include <linux/mm_inline.h>
-#include <linux/pagevec.h>
 #include <linux/backing-dev.h>
 #include <linux/rmap.h>
 #include <linux/topology.h>
@@ -661,7 +660,7 @@ redo:
                  * When racing with an mlock or AS_UNEVICTABLE clearing
                  * (page is unlocked) make sure that if the other thread
                  * does not observe our setting of PG_lru and fails
-                 * isolation/check_move_unevictable_page,
+                 * isolation/check_move_unevictable_pages,
                  * we see PG_mlocked/AS_UNEVICTABLE cleared below and move
                  * the page back to the evictable list.
                  *
@@ -3499,100 +3498,61 @@ int page_evictable(struct page *page, struct vm_area_struct *vma)
         return 1;
 }
 
+#ifdef CONFIG_SHMEM
 /**
- * check_move_unevictable_page - check page for evictability and move to appropriate zone lru list
- * @page: page to check evictability and move to appropriate lru list
- * @zone: zone page is in
+ * check_move_unevictable_pages - check pages for evictability and move to appropriate zone lru list
+ * @pages:      array of pages to check
+ * @nr_pages:   number of pages to check
  *
- * Checks a page for evictability and moves the page to the appropriate
- * zone lru list.
+ * Checks pages for evictability and moves them to the appropriate lru list.
  *
- * Restrictions: zone->lru_lock must be held, page must be on LRU and must
- * have PageUnevictable set.
+ * This function is only used for SysV IPC SHM_UNLOCK.
  */
-static void check_move_unevictable_page(struct page *page, struct zone *zone)
+void check_move_unevictable_pages(struct page **pages, int nr_pages)
 {
         struct lruvec *lruvec;
+        struct zone *zone = NULL;
+        int pgscanned = 0;
+        int pgrescued = 0;
+        int i;
 
-        VM_BUG_ON(PageActive(page));
-retry:
-        ClearPageUnevictable(page);
-        if (page_evictable(page, NULL)) {
-                enum lru_list l = page_lru_base_type(page);
-
-                __dec_zone_state(zone, NR_UNEVICTABLE);
-                lruvec = mem_cgroup_lru_move_lists(zone, page,
-                                                   LRU_UNEVICTABLE, l);
-                list_move(&page->lru, &lruvec->lists[l]);
-                __inc_zone_state(zone, NR_INACTIVE_ANON + l);
-                __count_vm_event(UNEVICTABLE_PGRESCUED);
-        } else {
-                /*
-                 * rotate unevictable list
-                 */
-                SetPageUnevictable(page);
-                lruvec = mem_cgroup_lru_move_lists(zone, page, LRU_UNEVICTABLE,
-                                                   LRU_UNEVICTABLE);
-                list_move(&page->lru, &lruvec->lists[LRU_UNEVICTABLE]);
-                if (page_evictable(page, NULL))
-                        goto retry;
-        }
-}
-
-/**
- * scan_mapping_unevictable_pages - scan an address space for evictable pages
- * @mapping: struct address_space to scan for evictable pages
- *
- * Scan all pages in mapping.  Check unevictable pages for
- * evictability and move them to the appropriate zone lru list.
- */
-void scan_mapping_unevictable_pages(struct address_space *mapping)
-{
-        pgoff_t next = 0;
-        pgoff_t end   = (i_size_read(mapping->host) + PAGE_CACHE_SIZE - 1) >>
-                         PAGE_CACHE_SHIFT;
-        struct zone *zone;
-        struct pagevec pvec;
-
-        if (mapping->nrpages == 0)
-                return;
-
-        pagevec_init(&pvec, 0);
-        while (next < end &&
-                pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
-                int i;
-                int pg_scanned = 0;
-
-                zone = NULL;
-
-                for (i = 0; i < pagevec_count(&pvec); i++) {
-                        struct page *page = pvec.pages[i];
-                        pgoff_t page_index = page->index;
-                        struct zone *pagezone = page_zone(page);
+        for (i = 0; i < nr_pages; i++) {
+                struct page *page = pages[i];
+                struct zone *pagezone;
 
-                        pg_scanned++;
-                        if (page_index > next)
-                                next = page_index;
-                        next++;
+                pgscanned++;
+                pagezone = page_zone(page);
+                if (pagezone != zone) {
+                        if (zone)
+                                spin_unlock_irq(&zone->lru_lock);
+                        zone = pagezone;
+                        spin_lock_irq(&zone->lru_lock);
+                }
 
-                        if (pagezone != zone) {
-                                if (zone)
-                                        spin_unlock_irq(&zone->lru_lock);
-                                zone = pagezone;
-                                spin_lock_irq(&zone->lru_lock);
-                        }
+                if (!PageLRU(page) || !PageUnevictable(page))
+                        continue;
 
-                        if (PageLRU(page) && PageUnevictable(page))
-                                check_move_unevictable_page(page, zone);
+                if (page_evictable(page, NULL)) {
+                        enum lru_list lru = page_lru_base_type(page);
+
+                        VM_BUG_ON(PageActive(page));
+                        ClearPageUnevictable(page);
+                        __dec_zone_state(zone, NR_UNEVICTABLE);
+                        lruvec = mem_cgroup_lru_move_lists(zone, page,
+                                                LRU_UNEVICTABLE, lru);
+                        list_move(&page->lru, &lruvec->lists[lru]);
+                        __inc_zone_state(zone, NR_INACTIVE_ANON + lru);
+                        pgrescued++;
                 }
-                if (zone)
-                        spin_unlock_irq(&zone->lru_lock);
-                pagevec_release(&pvec);
-
-                count_vm_events(UNEVICTABLE_PGSCANNED, pg_scanned);
         }
 
+        if (zone) {
+                __count_vm_events(UNEVICTABLE_PGRESCUED, pgrescued);
+                __count_vm_events(UNEVICTABLE_PGSCANNED, pgscanned);
+                spin_unlock_irq(&zone->lru_lock);
+        }
 }
+#endif /* CONFIG_SHMEM */
 
 static void warn_scan_unevictable_pages(void)
 {