The patch titled
mm: vmscan: fix force-scanning small targets without swap
has been added to the -mm tree. Its filename is
mm-vmscan-fix-force-scanning-small-targets-without-swap.patch
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------------------------------------------------------
Subject: mm: vmscan: fix force-scanning small targets without swap
From: Johannes Weiner <jweiner@xxxxxxxxxx>
Without swap, anonymous pages are not scanned. As such, they should not
count when considering force-scanning a small target if there is no swap.
Otherwise, targets are not force-scanned even when their effective scan
number is zero and the other conditions--kswapd/memcg--apply.
Signed-off-by: Johannes Weiner <jweiner@xxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
Cc: Ying Han <yinghan@xxxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 27 ++++++++++++---------------
1 file changed, 12 insertions(+), 15 deletions(-)
diff -puN mm/vmscan.c~mm-vmscan-fix-force-scanning-small-targets-without-swap mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-fix-force-scanning-small-targets-without-swap
+++ a/mm/vmscan.c
@@ -1830,23 +1830,15 @@ static void get_scan_count(struct zone *
u64 fraction[2], denominator;
enum lru_list l;
int noswap = 0;
- int force_scan = 0;
+ bool force_scan = false;
unsigned long nr_force_scan[2];
-
- anon = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
- zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
- file = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_FILE) +
- zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
-
- if (((anon + file) >> priority) < SWAP_CLUSTER_MAX) {
- /* kswapd does zone balancing and need to scan this zone */
- if (scanning_global_lru(sc) && current_is_kswapd())
- force_scan = 1;
- /* memcg may have small limit and need to avoid priority drop */
- if (!scanning_global_lru(sc))
- force_scan = 1;
- }
+ /* kswapd does zone balancing and need to scan this zone */
+ if (scanning_global_lru(sc) && current_is_kswapd())
+ force_scan = true;
+ /* memcg may have small limit and need to avoid priority drop */
+ if (!scanning_global_lru(sc))
+ force_scan = true;
/* If we have no swap space, do not bother scanning anon pages. */
if (!sc->may_swap || (nr_swap_pages <= 0)) {
@@ -1859,6 +1851,11 @@ static void get_scan_count(struct zone *
goto out;
}
+ anon = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
+ zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
+ file = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_FILE) +
+ zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+
if (scanning_global_lru(sc)) {
free = zone_page_state(zone, NR_FREE_PAGES);
/* If we have very few page cache pages,
_
Patches currently in -mm which might be from jweiner@xxxxxxxxxx are
memcg-pin-execution-to-current-cpu-while-draining-stock.patch
linux-next.patch
mm-vmscan-fix-force-scanning-small-targets-without-swap.patch
mm-vmscan-fix-force-scanning-small-targets-without-swap-fix.patch
mm-vmscan-drop-nr_force_scan-from-get_scan_count.patch
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