[PATCH] mm: rmap optimisation

[cascardo/linux.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b0cd81c..b2baca7 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -74,9 +74,6 @@ struct scan_control {
 
        int may_writepage;
 
-       /* Can pages be swapped as part of reclaim? */
-       int may_swap;
-
        /* This context's SWAP_CLUSTER_MAX. If freeing memory for
         * suspend, we effectively ignore SWAP_CLUSTER_MAX.
         * In this context, it doesn't matter that we scan the
@@ -367,7 +364,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
                res = mapping->a_ops->writepage(page, &wbc);
                if (res < 0)
                        handle_write_error(mapping, page, res);
-               if (res == WRITEPAGE_ACTIVATE) {
+               if (res == AOP_WRITEPAGE_ACTIVATE) {
                        ClearPageReclaim(page);
                        return PAGE_ACTIVATE;
                }
@@ -430,8 +427,6 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
                 * Try to allocate it some swap space here.
                 */
                if (PageAnon(page) && !PageSwapCache(page)) {
-                       if (!sc->may_swap)
-                               goto keep_locked;
                        if (!add_to_swap(page))
                                goto activate_locked;
                }
@@ -952,7 +947,6 @@ int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
 
        sc.gfp_mask = gfp_mask;
        sc.may_writepage = 0;
-       sc.may_swap = 1;
 
        inc_page_state(allocstall);
 
@@ -1055,7 +1049,6 @@ loop_again:
        total_reclaimed = 0;
        sc.gfp_mask = GFP_KERNEL;
        sc.may_writepage = 0;
-       sc.may_swap = 1;
        sc.nr_mapped = read_page_state(nr_mapped);
 
        inc_page_state(pageoutrun);
@@ -1353,76 +1346,3 @@ static int __init kswapd_init(void)
 }
 
 module_init(kswapd_init)
-
-
-/*
- * Try to free up some pages from this zone through reclaim.
- */
-int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
-{
-       struct scan_control sc;
-       int nr_pages = 1 << order;
-       int total_reclaimed = 0;
-
-       /* The reclaim may sleep, so don't do it if sleep isn't allowed */
-       if (!(gfp_mask & __GFP_WAIT))
-               return 0;
-       if (zone->all_unreclaimable)
-               return 0;
-
-       sc.gfp_mask = gfp_mask;
-       sc.may_writepage = 0;
-       sc.may_swap = 0;
-       sc.nr_mapped = read_page_state(nr_mapped);
-       sc.nr_scanned = 0;
-       sc.nr_reclaimed = 0;
-       /* scan at the highest priority */
-       sc.priority = 0;
-       disable_swap_token();
-
-       if (nr_pages > SWAP_CLUSTER_MAX)
-               sc.swap_cluster_max = nr_pages;
-       else
-               sc.swap_cluster_max = SWAP_CLUSTER_MAX;
-
-       /* Don't reclaim the zone if there are other reclaimers active */
-       if (atomic_read(&zone->reclaim_in_progress) > 0)
-               goto out;
-
-       shrink_zone(zone, &sc);
-       total_reclaimed = sc.nr_reclaimed;
-
- out:
-       return total_reclaimed;
-}
-
-asmlinkage long sys_set_zone_reclaim(unsigned int node, unsigned int zone,
-                                    unsigned int state)
-{
-       struct zone *z;
-       int i;
-
-       if (!capable(CAP_SYS_ADMIN))
-               return -EACCES;
-
-       if (node >= MAX_NUMNODES || !node_online(node))
-               return -EINVAL;
-
-       /* This will break if we ever add more zones */
-       if (!(zone & (1<<ZONE_DMA|1<<ZONE_NORMAL|1<<ZONE_HIGHMEM)))
-               return -EINVAL;
-
-       for (i = 0; i < MAX_NR_ZONES; i++) {
-               if (!(zone & 1<<i))
-                       continue;
-
-               z = &NODE_DATA(node)->node_zones[i];
-
-               if (state)
-                       z->reclaim_pages = 1;
-               else
-                       z->reclaim_pages = 0;
-       }
-
-       return 0;
-}