In __zone_reclaim case, we don't want to shrink mapped page. Nonetheless,

[karo-tx-linux.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e4dd1aee9a8daec3e85fb73673d6f13396801bbe..73e6d0699ef1f8ff410482afe725437ef409a75d 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1049,6 +1049,9 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
        if ((mode & ISOLATE_CLEAN) && (PageDirty(page) || PageWriteback(page)))
                return ret;
 
+       if ((mode & ISOLATE_UNMAPPED) && page_mapped(page))
+               return ret;
+
        if (likely(get_page_unless_zero(page))) {
                /*
                 * Be careful not to clear PageLRU until after we're
@@ -1478,6 +1481,12 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,
                reclaim_mode |= ISOLATE_ACTIVE;
 
        lru_add_drain();
+
+       if (!sc->may_unmap)
+               reclaim_mode |= ISOLATE_UNMAPPED;
+       if (!sc->may_writepage)
+               reclaim_mode |= ISOLATE_CLEAN;
+
        spin_lock_irq(&zone->lru_lock);
 
        if (scanning_global_lru(sc)) {
@@ -1598,19 +1607,26 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
        struct page *page;
        struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
        unsigned long nr_rotated = 0;
+       isolate_mode_t reclaim_mode = ISOLATE_ACTIVE;
 
        lru_add_drain();
+
+       if (!sc->may_unmap)
+               reclaim_mode |= ISOLATE_UNMAPPED;
+       if (!sc->may_writepage)
+               reclaim_mode |= ISOLATE_CLEAN;
+
        spin_lock_irq(&zone->lru_lock);
        if (scanning_global_lru(sc)) {
                nr_taken = isolate_pages_global(nr_pages, &l_hold,
                                                &pgscanned, sc->order,
-                                               ISOLATE_ACTIVE, zone,
+                                               reclaim_mode, zone,
                                                1, file);
                zone->pages_scanned += pgscanned;
        } else {
                nr_taken = mem_cgroup_isolate_pages(nr_pages, &l_hold,
                                                &pgscanned, sc->order,
-                                               ISOLATE_ACTIVE, zone,
+                                               reclaim_mode, zone,
                                                sc->mem_cgroup, 1, file);
                /*
                 * mem_cgroup_isolate_pages() keeps track of