[PATCH] remove calculation for reclaiming anonymose page if system have no swap device

["minchan kim" <minchan.kim@gmail.com>]

If system have no swap device, scan_control's may_swap field have to
be set to zero.
This patch will remove redundant calc_reclaim_mapped call which called
in shrink_active_list by sc->may_swap.

This patch is made from 2.6.24-rc6-mm1.

Signed-off-by: minchan kim <minchan.kim@gmail.com>
---
 mm/vmscan.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 45cee1c..7284d79 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1427,7 +1427,11 @@ unsigned long try_to_free_pages(struct zone
**zones, int order, gfp_t gfp_mask)
        .gfp_mask = gfp_mask,
        .may_writepage = !laptop_mode,
        .swap_cluster_max = SWAP_CLUSTER_MAX,
+#ifdef CONFIG_SWAP
        .may_swap = 1,
+#else
+       .may_swap = 0,
+#endif
        .swappiness = vm_swappiness,
        .order = order,
        .mem_cgroup = NULL,
@@ -1445,7 +1449,11 @@ unsigned long
try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
    struct scan_control sc = {
        .gfp_mask = gfp_mask,
        .may_writepage = !laptop_mode,
+#ifdef CONFIG_SWAP
        .may_swap = 1,
+#else
+       .may_swap = 0,
+#endif
        .swap_cluster_max = SWAP_CLUSTER_MAX,
        .swappiness = vm_swappiness,
        .order = 0,
@@ -1493,7 +1501,11 @@ static unsigned long balance_pgdat(pg_data_t
*pgdat, int order)
    struct reclaim_state *reclaim_state = current->reclaim_state;
    struct scan_control sc = {
        .gfp_mask = GFP_KERNEL,
+#ifdef CONFIG_SWAP
        .may_swap = 1,
+#else
+       .may_swap = 0,
+#endif
        .swap_cluster_max = SWAP_CLUSTER_MAX,
        .swappiness = vm_swappiness,
        .order = order,
@@ -2003,7 +2015,11 @@ static int __zone_reclaim(struct zone *zone,
gfp_t gfp_mask, unsigned int order)
    unsigned long nr_reclaimed = 0;
    struct scan_control sc = {
        .may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
+#ifdef CONFIG_SWAP
        .may_swap = !!(zone_reclaim_mode & RECLAIM_SWAP),
+#else
+       .may_swap = 0,
+#endif
        .swap_cluster_max = max_t(unsigned long, nr_pages,
                    SWAP_CLUSTER_MAX),
        .gfp_mask = gfp_mask,
-- 
1.5.2.5




-- 
Kinds regards,
minchan kim
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