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Subject[PATCH] vmscan: ZVC updates in shrink_active_list() can be done once
This effectively lifts the unit of nr_inactive_* and pgdeactivate updates
from PAGEVEC_SIZE=14 to SWAP_CLUSTER_MAX=32.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
mm/vmscan.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
--- linux.orig/mm/vmscan.c
+++ linux/mm/vmscan.c
@@ -1228,7 +1228,6 @@ static void shrink_active_list(unsigned
struct scan_control *sc, int priority, int file)
{
unsigned long pgmoved;
- int pgdeactivate = 0;
unsigned long pgscanned;
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_inactive);
@@ -1257,7 +1256,7 @@ static void shrink_active_list(unsigned
__mod_zone_page_state(zone, NR_ACTIVE_ANON, -pgmoved);
spin_unlock_irq(&zone->lru_lock);

- pgmoved = 0;
+ pgmoved = 0; /* count referenced (mapping) mapped pages */
while (!list_empty(&l_hold)) {
cond_resched();
page = lru_to_page(&l_hold);
@@ -1291,7 +1290,7 @@ static void shrink_active_list(unsigned
*/
reclaim_stat->recent_rotated[!!file] += pgmoved;

- pgmoved = 0;
+ pgmoved = 0; /* count pages moved to inactive list */
while (!list_empty(&l_inactive)) {
page = lru_to_page(&l_inactive);
prefetchw_prev_lru_page(page, &l_inactive, flags);
@@ -1304,10 +1303,7 @@ static void shrink_active_list(unsigned
mem_cgroup_add_lru_list(page, lru);
pgmoved++;
if (!pagevec_add(&pvec, page)) {
- __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
spin_unlock_irq(&zone->lru_lock);
- pgdeactivate += pgmoved;
- pgmoved = 0;
if (buffer_heads_over_limit)
pagevec_strip(&pvec);
__pagevec_release(&pvec);
@@ -1315,9 +1311,8 @@ static void shrink_active_list(unsigned
}
}
__mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
- pgdeactivate += pgmoved;
__count_zone_vm_events(PGREFILL, zone, pgscanned);
- __count_vm_events(PGDEACTIVATE, pgdeactivate);
+ __count_vm_events(PGDEACTIVATE, pgmoved);
spin_unlock_irq(&zone->lru_lock);
if (buffer_heads_over_limit)
pagevec_strip(&pvec);

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