vmscan: kill sc.swap_cluster_max

Now, All caller of reclaim use swap_cluster_max as SWAP_CLUSTER_MAX.
Then, we can remove it perfectly.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d55d106..2b1c748 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -71,12 +71,6 @@ struct scan_control {
        /* 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
-        * whole list at once. */
-       int swap_cluster_max;
-
        int swappiness;
 
        int all_unreclaimable;
@@ -1137,7 +1131,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                unsigned long nr_anon;
                unsigned long nr_file;
 
-               nr_taken = sc->isolate_pages(sc->swap_cluster_max,
+               nr_taken = sc->isolate_pages(SWAP_CLUSTER_MAX,
                             &page_list, &nr_scan, sc->order, mode,
                                zone, sc->mem_cgroup, 0, file);
 
@@ -1572,15 +1566,14 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
  * until we collected @swap_cluster_max pages to scan.
  */
 static unsigned long nr_scan_try_batch(unsigned long nr_to_scan,
-                                      unsigned long *nr_saved_scan,
-                                      unsigned long swap_cluster_max)
+                                      unsigned long *nr_saved_scan)
 {
        unsigned long nr;
 
        *nr_saved_scan += nr_to_scan;
        nr = *nr_saved_scan;
 
-       if (nr >= swap_cluster_max)
+       if (nr >= SWAP_CLUSTER_MAX)
                *nr_saved_scan = 0;
        else
                nr = 0;
@@ -1599,7 +1592,6 @@ static void shrink_zone(int priority, struct zone *zone,
        unsigned long percent[2];       /* anon @ 0; file @ 1 */
        enum lru_list l;
        unsigned long nr_reclaimed = sc->nr_reclaimed;
-       unsigned long swap_cluster_max = sc->swap_cluster_max;
        unsigned long nr_to_reclaim = sc->nr_to_reclaim;
        struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
        int noswap = 0;
@@ -1622,15 +1614,15 @@ static void shrink_zone(int priority, struct zone *zone,
                        scan = (scan * percent[file]) / 100;
                }
                nr[l] = nr_scan_try_batch(scan,
-                                         &reclaim_stat->nr_saved_scan[l],
-                                         swap_cluster_max);
+                                         &reclaim_stat->nr_saved_scan[l]);
        }
 
        while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
                                        nr[LRU_INACTIVE_FILE]) {
                for_each_evictable_lru(l) {
                        if (nr[l]) {
-                               nr_to_scan = min(nr[l], swap_cluster_max);
+                               nr_to_scan = min_t(unsigned long,
+                                                  nr[l], SWAP_CLUSTER_MAX);
                                nr[l] -= nr_to_scan;
 
                                nr_reclaimed += shrink_list(l, nr_to_scan,
@@ -1838,7 +1830,6 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
        struct scan_control sc = {
                .gfp_mask = gfp_mask,
                .may_writepage = !laptop_mode,
-               .swap_cluster_max = SWAP_CLUSTER_MAX,
                .nr_to_reclaim = SWAP_CLUSTER_MAX,
                .may_unmap = 1,
                .may_swap = 1,
@@ -1863,7 +1854,6 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
                .may_writepage = !laptop_mode,
                .may_unmap = 1,
                .may_swap = !noswap,
-               .swap_cluster_max = SWAP_CLUSTER_MAX,
                .swappiness = swappiness,
                .order = 0,
                .mem_cgroup = mem,
@@ -1897,7 +1887,6 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
                .may_writepage = !laptop_mode,
                .may_unmap = 1,
                .may_swap = !noswap,
-               .swap_cluster_max = SWAP_CLUSTER_MAX,
                .nr_to_reclaim = SWAP_CLUSTER_MAX,
                .swappiness = swappiness,
                .order = 0,
@@ -1969,7 +1958,6 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
                .gfp_mask = GFP_KERNEL,
                .may_unmap = 1,
                .may_swap = 1,
-               .swap_cluster_max = SWAP_CLUSTER_MAX,
                /*
                 * kswapd doesn't want to be bailed out while reclaim. because
                 * we want to put equal scanning pressure on each zone.
@@ -2354,7 +2342,6 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
                .may_swap = 1,
                .may_unmap = 1,
                .may_writepage = 1,
-               .swap_cluster_max = SWAP_CLUSTER_MAX,
                .nr_to_reclaim = nr_to_reclaim,
                .hibernation_mode = 1,
                .swappiness = vm_swappiness,
@@ -2539,7 +2526,6 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
                .may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
                .may_unmap = !!(zone_reclaim_mode & RECLAIM_SWAP),
                .may_swap = 1,
-               .swap_cluster_max = SWAP_CLUSTER_MAX,
                .nr_to_reclaim = max_t(unsigned long, nr_pages,
                                       SWAP_CLUSTER_MAX),
                .gfp_mask = gfp_mask,